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Artículos de revistas sobre el tema "Adsorbant"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 20 de octubre de 2023

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1

Kadhim, Bashar J., Afraa H. Kamel y Bashir Ahmed. "Optimization of Dye Removal Using Waste Natural Material and Polymer Particles". Journal of Engineering 22, n.º 10 (1 de octubre de 2016): 38–51. http://dx.doi.org/10.31026/j.eng.2016.10.03.

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In this paper waste natural material (date seed) and polymer particles(UF) were used for investigation of removal dye of the potassium permanganate. Also study effect some variables such as pH, dye concentration and adsorbent concentration on dye removal. 15 experimental runs were done using the itemized conditions designed established on the Box-Wilson design employed to optimize dye removal. The optimum conditions for the dye removal were found: (pH) 12, (dye con.) 2.38 ppm, (adsorbant con.) 0.0816 gm for date seed with 95.22% removal and for UF (pH) 12, (dye con.) 18 ppm, (adsorbant con.) 0.2235 gm with 91.43%. The value of R-square was 85.47% for Date seed and (88.77%) for UF.
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2

MEGHANA, P. KARUNASRI, K. VENKATA PRAVALIKA, P. JANAKI SRIRAM y K. RAVINDHRANATH. "Effective Removal of Hexavalent Chromium from Polluted Water using Phoenix sylvestris Seed Powder as Adsorbent". Asian Journal of Chemistry 31, n.º 6 (29 de abril de 2019): 1327–31. http://dx.doi.org/10.14233/ajchem.2019.21760.

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Phoenix sylvestris seed powder (PSSP) was investigated as an adsorbent for the removal of chromium(VI) ions from water using batch extraction method. The conditions for the maximum extraction were optimized. The adsorption capacity was found to be 22.5 mg/g at pH= 2, contact time: 60 min, PSSP dosage: 0.40 g/500mL, rpm: 300 and temp.: 28 ± 2 ºC and found to be more suitable adsorbant than compared to other reported adsorbents in the literature. Co-ions even in five-fold excess were less interfered. Regeneration studies revealed that Phoenix sylvestris seed powder can be used up to three cycles. The method developed was successfully applied to polluted water/industrial effluents samples.
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3

Hasanah, Ulfa Imroathul, Budi Utami y Endang Susilowati. "Combination of Corn Waste and Egg Shell as Zn Metal Adsorbent with Batch System". JKPK (Jurnal Kimia dan Pendidikan Kimia) 7, n.º 2 (30 de agosto de 2022): 223. http://dx.doi.org/10.20961/jkpk.v7i2.55440.

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<p>This study aims to determine: the ability of corn cobs and eggshells as Zn metal adsorbents, functional groups of corn cobs and eggshells adsorbent, what isotherm patterns occur in the adsorbent corn cobs and eggshells in adsorbing Zn metal, the optimum ratio and optimum mass of the adsorbent composition of corn cobs and eggshells in Zn metal adsorption, the optimum contact time for adsorbent corn cobs and eggshell in adsorbing Zn metal, the optimum concentration of adsorbate to be adsorbed by corn cobs and eggshell adsorbents. This study used an experimental method in the laboratory. characterization includes functional groups using FTIR, and test the effectiveness of adsorbents using the AAS instrument. Kinetic analysis of adsorbent by adsorption isotherm with Langmuir isotherm, Freundlich isotherm, Temkin isotherm, and dubinin-radushkevivh isotherm. The results showed that: Corn cobs and eggshells can be used as zinc metal adsorbents; in the corn cobs adsorbent, there is a functional group -OH at wave number 3415,15 cm<sup>-1</sup> and in the eggshell, there is a bent vibration of calcium carbonate at wave number 3400,65 cm<sup>-1</sup>, the adsorption process of Zn metal by adsorbent corn cobs and egg shells follows the Langmuir isotherm pattern (chemical adsorption), the comparison of the optimum composition and mass of the adsorbent corn cobs and eggshells in Zn metal adsorption are 1:2 and 0,15 grams with Zn metal adsorbed by 80,4571%, the optimum contact time for the adsorbent corn cobs and eggshells in adsorbing Zn metal is 90 minutes with the percentage of absorbed Zn metal concentration is 75,5957%, and the optimum concentration of adsorbate for adsorbed by corn cob and eggshell adsorbents is 1 mg/L with adsorbed Zn percentage of 82,8377%.</p>
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Ion, Constantin Sorin, Mihaela Bombos, Rami Doukeh, Gabriel Vasilievici y Vasile Matei. "Kinetics of 1-dodecanethiol Desulfurization by Reactive Adsorbtion on MgO/dolomite". Revista de Chimie 69, n.º 12 (15 de enero de 2019): 3439–44. http://dx.doi.org/10.37358/rc.18.12.6765.

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Desulfurisation of 1-dodecanethiol was performed by adsorption process on MgO adsorbent. The adsorbant was characterized by determining the adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments were performed in continuous system at 300-450�C, 5 atm and volume hourly space velocities of 1�2 h-1. Conversion of 1-dodecanetol increases with increasing temperature and decreasing volume hourly space velocities. It was identified the stage determinant of the process and a kinetic study of the desulfurization process was developed by reactive adsorption of 1-dodecanethiol on a magnesium oxide adsorbent.
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5

Afrianita, Reri y Yommi Dewilda. "EFISIENSI DAN KAPASITAS PENYERAPAN FLY ASH SEBAGAI ADSORBEN DALAM PENYISIHAN LOGAM TIMBAL (Pb) LIMBAH CAIR INDUSTRI PERCETAKAN DI KOTA PADANG". Jurnal Dampak 10, n.º 1 (1 de enero de 2013): 1. http://dx.doi.org/10.25077/dampak.10.1.1-10.2013.

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ABSTRAKPenelitian ini bertujuan untuk menentukan kondisi optimum fly ash sebagai adsorben dalam menyisihan logam timbal (Pb). Penelitian adsorpsi dilakukan secara batch dengan menggunakan larutan artifisial Pb dengan variasi diameter adsorben, berat adsorben, waktu kontak dan kecepatan pengadukan. Hasil penelitian diperoleh kondisi optimum untuk setiap variasi parameter adalah diameter adsorben 0,075-0,14 mm, berat adsorben 1 gam, pH adsorbat 4, waktu kontak 60 menit, dan kecepatan pengadukan 120 rpm. Dapat disimpulkan makin kecil adsorben, maka semakin luas permukaan aktif pada adsorben serta kecepatan pengadukan yang rendah menyebabkan kurang efektifnya tumbukan yang terjadi antar adsorben dan adsorbat.Kata kunci: adsorpsi, fly ash, logam timbal (Pb), kondisi optimum.ABSTRACTThe aim of this research is to determine optimum conditionof fly ash as the adsorbent in the removal of lead (Pb) in water. The research was conducted in a batch method by using artificial Pb with different adsorbent diameters, contact times and mixing rates. Result showed the optimum condition of adsorbent diameter was 0.075-0.14 mm with weight of 1 gram, adsorbate pH of 4, contact time of 60 minutes, and the mixing rate of 120 rpm. From this research, it can be concluded that the less of adsorbent size will lead to the larger active surface area and the slower mixing rate will cause to the less effectiveness of adsorbent and adsorbate collision in water.Keywords:adsorption, fly ash, lead (Pb), optimum condition
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6

Halas, Stanisław y Tomasz Durakiewicz. "Improved adsorbant trap for gases". Chemical Geology 122, n.º 1-4 (mayo de 1995): 271–73. http://dx.doi.org/10.1016/0009-2541(95)00035-k.

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7

Fiset, J. F., J. F. Blais, R. Ben Cheikh y R. D. Tyagi. "Revue sur l'enlèvement des métaux des effluents par adsorption sur la sciure et les écorces de bois". Revue des sciences de l'eau 13, n.º 3 (12 de abril de 2005): 325–49. http://dx.doi.org/10.7202/705397ar.

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Les résidus de transformation du bois tels les écorces et la sciure de bois ont été largement étudiés depuis quelques années pour leur propriété d'adsorption et d'enlèvement des métaux toxiques contenus dans les effluents contaminés. En ce qui concerne la sciure de bois, les recherches répertoriées ont porté principalement sur l'utilisation du sapin rouge, du manga, du tilleul, de l'épinette, du pin, du cèdre, du teck, de l'akamatsu et du buna. Pour ce qui est des écorces de bois, plusieurs espèces ont été étudiées, notamment les écorces de pin, de chêne et d'épinette. La présente revue fait le point sur les performances de ces différents adsorbants peu coûteux pour l'adsorption des principaux métaux contaminants (Cd, Cr, Cu, Hg, Ni, Pb et Zn). Les points discutés portent sur les méthodes de préparation (lavage, séchage et tamisage) et de traitement chimique de l'adsorbant (traitement acide ou basique, traitement à la formaldéhyde, phosphatation, carboxylation, sulfoéthylation, carboxyméthylation, etc.), les conditions opératoires utilisées lors de l'adsorption, les modèles thermodynamiques, cinétiques et autres applicables au couple adsorbant-adsorbat, l'effet des principaux paramètres opératoires (temps de contact, pH de traitement, température, concentration d'adsorbant, taille des particules, etc.), les principes et les mécanismes impliqués dans l'élimination des contaminants métalliques par les adsorbants présentés.
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8

Bariyah, Khoerul, Nuri Andarwulan y Purwiyatno Hariyadi. "Pengurangan Kadar Digliserida dan Asam Lemak Bebas dalam Minyak Sawit Kasar Menggunakan Adsorben". Agritech 37, n.º 1 (10 de marzo de 2017): 49. http://dx.doi.org/10.22146/agritech.17009.

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Indonesia is the world’s largest crude palm oil (CPO) producer and consumer in 2014. Components that affect the quality of CPO are diglycerides (DAGs) and free fatty acids (FFA). DAGs in palm oil are known as the precursor of 3-MCPD esters, while higher content of FFA could influence the oil stability. The contact of CPO with adsorbent could affect the present of DAG and FFA in CPO. The purpose of this study was to determine the best type of adsorbent in reducing DAGs and FFA in CPO with emphasis on the characteristics of the adsorbent and adsorbate. This study was carried out by using three different types of CPO quality and six different types of adsorbent (carbon active, MgO, Magnesol R-60, and 3 types of bleaching earth). The contact process of CPO with different adsorbents were carried out at a temperature of 50-60 °C (without vacuum) for adsorbents selection and 90 °C (under vacuum) for 30 minutes at a dose of adsorbent 1 and 3 %. The contact process of different adsorbents with CPO have not been able to reduce both DAGs and FFA significantly at the non vacuum condition in three differents CPO sample. The combination of MgO and bleaching earth type 1 could reduce FFA up to 70 % reaching the content of 14 % at vacuum conditions, but did not reduce DAGs of CPO. Different CPO quality and adsorbent characteristics will affect the reduction process of FFA and DAGs. ABSTRAKIndonesia merupakan negara produsen sekaligus konsumen minyak sawit kasar (Crude Palm Oil/CPO) terbesar di dunia pada tahun 2014. Salah satu komponen yang mempengaruhi kualitas CPO adalah digliserida (DAG) dan asam lemak bebas (ALB). DAG dalam minyak sawit adalah prekursor pembentuk senyawa karsinogen 3-MCPD ester, sedangkan ALB yang tinggi dapat mempengaruhi stabilitas minyak. Proses kontak adsorben ke dalam CPO akan mempengaruhi keberadaan kedua komponen tersebut. Tujuan penelitian ini adalah untuk menentukan jenis adsorben yang paling baik dalam mengadsorp digliserida dan asam lemak bebas dalam CPO dengan menitikberatkan pada karakteristik adsorben dan adsorbat. Penelitian dilakukan terhadap 3 jenis CPO (nilai ALB: 4, 6, dan 14) dan 6 jenis adsorben (arang aktif, MgO, Magnesol R-60, dan 3 jenis bleaching earth). Proses kontak dilakukan pada suhu 50 – 60 °C (tanpa vakum) untuk seleksi adsorben dan 90 °C (dengan vakum) selama 30 menit dengan dosis adsorben 1 dan 3 %. Proses kontak adsorben pada CPO dengan kondisi adsorpsi tanpa vakum belum dapat menurunkan DAG dan ALB secara signifikan terhadap ketiga jenis CPO. Kombinasi antara adsorben bleaching earth tipe 1 dan MgO dapat menurunkan ALB hingga 70 % pada CPO dengan ALB 14 % pada kondisi vakum, tetapi tidak dapat menurunkan DAG. Karakterisitik CPO dan adsorben mempengaruhi proses reduksi ALB dan DAG.
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Riaz, Nadia, Mohammad Azmi Bustam, Chong Fai Kait, Zakaria B. Man, Muhammad Saqib Khan, Mohd Shariff Azmi, Biruh Shimekit, Sami Ullah y Ali E. I. Elkhalifah. "Adsorption of Azo Dye Orange II by Supported TiO2: A Review". Applied Mechanics and Materials 625 (septiembre de 2014): 770–74. http://dx.doi.org/10.4028/www.scientific.net/amm.625.770.

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The supported TiO2 photocatalyst has been reported for the photodegradation of different organic pollutants. These supported TiO2 photocatalysts include metal and non metal doped TiO2 photocatalysts. The photodegradation can be explained in terms of adsorption. The adsorption of the dye is an significant and obvious parameter in the photodegradation process. The photodegradation is directly related to the adsorbed quantities of the pollutant onto the surface of adsorbant. Adsorption of Orange II, an azo dye has been reported using different adsorbents like fly ash, activated carbon and porous titanium dioxide. This review presents a comparison of maximum adsorption capacities (Qm; mg.g–1) and Langmuir adsorption constant (Kads; L.mg–1) for the adsorbents reported in previous studies.
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Asep Bayu Dani Nandiyanto, Meli Fiandini, Risti Ragadhita, Hanifa Maulani, Muthia Nurbaiti, Abdulkareem Sh. Mahdi Al-Obaidi, Jumril Yunas y Muhammad Roil Bilad. "Sustainable Biochar Carbon Biosorbent Based on Tamarind (Tamarindusindica L) Seed: Literature Review, Preparation, and Adsorption Isotherm". Journal of Advanced Research in Applied Sciences and Engineering Technology 32, n.º 1 (19 de agosto de 2023): 210–26. http://dx.doi.org/10.37934/araset.32.1.210226.

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In the need for a sustainable environment and clean water for assisting sustainable development goals (SDGs) in developing countries, this study demonstrates the way how to produce biochar carbon microparticles from tamarind seed waste and investigates the proposal mechanism during the adsorption by comparing results with ten adsorption isotherm models. In short, carbon microparticles (sizes of 500, 1000, and 2000 m) were prepared by carbonizing saw-milled tamarind seeds at 250 C. The adsorption was evaluated in the batch reactor for adsorbing curcumin (as a model of dye). The models confirmed the formation of a layer with physisorption characteristics and binding energy due to the existence of the Van der Waals force. The adsorption profile was also done by varying adsorbent sizes and initial adsorbate loadings. Small-sized adsorbents gave impacts the improvement of adsorption capacity due to the presence of a larger surface area, a larger number of adsorption sites, and additional adsorbate-adsorbate interaction. Fewer loadings of the adsorbate results in less adsorption efficacy due to the less adsorbate-adsorbent contact and interaction. Understanding the processes happening is beneficial for future advances and applications, such as catalysts and adsorbents, particularly concerning the utilization of carbon materials from organic waste.
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11

Journal, Baghdad Science. "The Removal of Zinc from Aqueous Solutions Using Malvaparviflora". Baghdad Science Journal 13, n.º 3 (4 de septiembre de 2016): 482–88. http://dx.doi.org/10.21123/bsj.13.3.482-488.

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In this study, the adsorption of Zn (NO3)2 is carried out by using surfaces of malvaparviflora. The validity of the adsorption is evaluated by using atomic absorption Spectrophotometry through determination the amount of adsorbed Zn (NO3)2. Various parameters such as PH, adsorbent weight and contact time are studied in terms of their effect on the reaction progress. Furthermore, Lagergren’s equation is used to determine adsorption kinetics. It is observed that high removal of Zn (NO3)2 is obtained at PH=2. High removal of Zn (NO3)2 is at the time equivalent of 60 min and reaches equilibrium,where 0.25gm is the best weight of adsorbant . For kinetics the reaction onto malvaparviflora follows pseudo first order Lagergren’s equation.
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12

Wu, Jing, Nü Wang, Yong Zhao y Lei Jiang. "Simple synthesis of smart magnetically driven fibrous films for remote controllable oil removal". Nanoscale 7, n.º 6 (2015): 2625–32. http://dx.doi.org/10.1039/c4nr05721j.

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The smart magnetically controllable oil removal carrier was successfully fabricatedviaelectrospinning. It effectively overcomes the drawback of the otherin situoil adsorbant materials and can be easily recovered.
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13

Kekes, Tryfon, Virginia Giannou, Constantina Tzia y Georgios Kolliopoulos. "Synthesis of a Novel Adsorbing Agent by Coupling Chitosan, β-Cyclodextrin, and Cerium Dioxide: Evaluation of Hexavalent Chromium Removal Efficacy from Aqueous Solutions". Sustainability 14, n.º 20 (19 de octubre de 2022): 13527. http://dx.doi.org/10.3390/su142013527.

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The present study aimed at synthesizing a novel adsorbing agent by coupling chitosan, β-cyclodextrin, and cerium dioxide (Chit/β-CyD/Ce). Its efficiency towards the removal of hexavalent chromium from aqueous solutions was studied and compared to an adsorbent comprising of only chitosan and cerium dioxide. Batch water purification experiments in varying experimental conditions (initial adsorbent concentration 5–100 mg/L, adsorbate concentration 0.1–2 g/L, pH 2–11, and temperature 15–50 °C) were carried out to evaluate the effectiveness of both adsorbents. In all the experimental cases, the Chit/β-CyD/Ce adsorbent exhibited the higher efficacy. The optimum operating conditions were found to be at an initial adsorbent concentration of 2 g/L, pH = 3, and temperature of 50 °C, with the Chit/β-CyD/Ce adsorbent being able to fully remove Cr(VI) from solutions with up to 50 mg/L Cr(VI) at these conditions. The adsorption of hexavalent chromium onto both adsorbents occurs in a multilayer pattern of a heterogeneous surface following the Freundlich isotherm model. Furthermore, the adsorption process was exothermic and obeyed the pseudo-second-order kinetic model, thus indicating the occurrence of chemisorption. Finally, FTIR, XRD, and SEM analyses were performed to characterize the synthesized adsorbents and verify the adsorption process.
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Fattah, Bayan abdel, Mohamed Mossad y Hisham Kh El-Etriby. "Heavy metals sorption onto alluvial soil under various operational conditions". Water Practice and Technology 14, n.º 3 (10 de julio de 2019): 652–64. http://dx.doi.org/10.2166/wpt.2019.050.

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Abstract The removal of lead Pb+2, copper Cu+2 and cadmium Cd+2 from aqueous solutions by alluvial soil (AL) as adsorbent has been investigated in a series of laboratory scale experiments under various operational conditions (solution pH, adsorbent dose, ions concentration and contact time). Characterization of AL has been carried out using infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The surface of AL beads is irregular with many spaces, channels and holes, which are helpful for mass transfer of metal ions into AL soil. The optimum ions removal can be achieved in alkaline solutions. Ions removal efficiency is directly related to contact time and adsorbant dose and inversely related to the initial ions concentration. Ion selectivity on AL followed the order of Pb+2 &gt; Cu+2 &gt; Cd+2. The results confirm that AL can remove heavy metals from wastewater efficiently, which is a cheap and environmentally friendly adsorbent. Langmuir and Freundlich isotherms fit the experimental data perfectly. The results indicate that the adsorption of pb+2, Cu+2 and Cd+2 ions is well fitted by the pseudo second-order kinetic model.
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Agustiani, Tia, Asep Saefumillah y Hanies Ambarsari. "Studi Pemanfaatan Limbah Biomassa sebagai Raw Material Adsorben SiC dalam Penurunan Konsentrasi Amonia sebagai Parameter Bau dalam Air Limbah". Jurnal Teknologi Lingkungan 22, n.º 2 (31 de julio de 2021): 190–98. http://dx.doi.org/10.29122/jtl.v22i2.4838.

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ABSTRACT Biomass as raw material is one solution that can be developed in the management of agricultural, plantation, and industrial waste. The utilization of biomass-derived from waste can help reduce pollution and environmental pollution. This research was conducted to make Silicon Carbide (SiC) adsorbent from wood biomass using Sengon sawdust as a source of carbon and non-wood biomass, namely coconut husk, as a source of silica. SiC adsorbent is applied for ammonium adsorption, which has implications on reducing ammonia gas from wastewater, reducing odor. The research methods included isolation of silica and carbon, the production of SiC adsorbent by magnesiothermic reduction, and the characterization of SiC adsorbents with XRD and SEM-EDX. Adsorption capacities of SiC to ammonium were determined according to SiO2:C adsorbent ratios (1:3 and 5:3), adsorbent mass variations, and ammonium concentrations in simulated wastewater using the spectrophotometric method. The results showed that SiC could be used as an adsorbent because there are pores on the surface structure. The optimum SiO2:C adsorbent ratio in adsorbing ammonium was 1:3 (SiC 136) with 45% adsorbed ammonium and an adsorption capacity of 0.47 mg/g. The optimum adsorbent mass in adsorbing ammonium was 0.1 g with 41.77% adsorbed ammonium. The optimum concentration of ammonium in simulated wastewater for ammonium adsorption was 20 mg/L with 46.25% adsorbed ammonium. The adsorption isotherm pattern during the ammonium adsorption process follows the Freundlich isotherm, which means that the adsorption process occurs physically. Keywords: adsorbent, adsorption, ammonia, biomass, coconut husk, SiC ABSTRAK Biomassa sebagai raw material merupakan salah satu solusi yang dapat dikembangkan dalam pengelolaan limbah hasil pertanian, perkebunan, dan industri. Pemanfaatan biomassa yang berasal dari limbah dapat membantu mengurangi tingkat polusi dan pencemaran lingkungan. Penelitian ini dilakukan untuk membuat adsorben Silikon Carbida (SiC) dari biomassa kayu yaitu memanfaatkan serbuk gergaji kayu Sengon sebagai sumber karbon dan biomassa non kayu yaitu sabut kelapa sebagai sumber silika. Adsorben SiC diaplikasikan dalam penjerapan amonium yang berimplikasi pada potensi penurunan gas amonia dari air limbah sehingga adsorben SiC berpotensi mengurangi bau dalam air limbah. Metode penelitian meliputi isolasi silika, isolasi karbon, pembuatan adsorben SiC secara reduksi magnesiotermik dan karakterisasi adsorben SiC dengan XRD dan SEM-EDX. Penentuan daya adsorpsi SiC sebagai adsorben terhadap variasi rasio adsorben SiO2:C (1:3 dan 5:3), variasi massa adsorben, variasi konsentrasi limbah simulasi menggunakan metode spektrofotometri. Hasil penelitian menunjukkan bahwa SiC dapat digunakan sebagai adsorben karena terdapat pori-pori pada struktur permukaan. Variasi rasio adsorben SiO2:C optimum dalam mengadsorpsi amonium ialah SiC 136 dengan amonium teradsorpsi sebanyak 45% dan kapasitas adsorpsi sebesar 0,47 mg/g. Massa adsorben optimum dalam mengadsorpsi amonium ialah 0,1 g dengan amonium teradsorpsi 41,77%. Konsentrasi optimum limbah simulasi dalam adsorpsi amonium 20 mg/L dengan amonium teradsorpsi 46,25%. Pola isoterm adsorpsi selama proses adsorpsi amonium mengikuti isoterm Freundlich, yang berarti proses adsorpsi cenderung terjadi secara fisika. Kata kunci: adsorben, adsorpsi, amonia, biomassa, sabut kelapa, SiC
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Lamesch, P., U. Jost, D. Schreiter, L. Scheibner, O. Beier, J. Fangmann y J. Hauss. "Molecular adsorbant recirculating system in patients with liver failure". Transplantation Proceedings 33, n.º 7-8 (noviembre de 2001): 3480–82. http://dx.doi.org/10.1016/s0041-1345(01)02499-x.

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Sihombing, Rony Pasonang, Keryanti Keryanti, Fitria Yulistiani y Ayu Ratna Permanasari. "Studi Literatur Pengaruh Pirolisis, Jenis Adsorban serta Aktivator dalam Karakterisasi Asap Cair". Fullerene Journal of Chemistry 6, n.º 1 (30 de abril de 2021): 54. http://dx.doi.org/10.37033/fjc.v6i2.234.

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Liquid smoke is a preservative solution that can be used safely. This grade 1 product can be also used as food preservative. The aim of this article is to discuss and examine the previous experiment’s results by literature review. The outcome of this article is expected to be regenerated by other research using the existing variable which is discussed on this article or using new variable. Based on the result. There are some variables that effect the final quality of liquid smoke. Some of them are pyrolisys temperature, pyrolisys time, adsorbant type and activator type. Pyrolisys temperature used was arround 250 °C – 300 °C with resulted pH 1.41 to 2.25. While for pyrolisys temperature was arround 4 – 5 hours with phenol content arround 3.04% to 4.08%. The type of adsorbant used was zeoilte and quartz sand, which the acid total having both increment and decrement phenomenon. Activator type used were salt activator such as NaCl , NaHCO, CaCl2, Na2SO4 and base activator (NaOH) which producing the most percent acid total.
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Rasoulifard, Mohammad Hossein, Soghra Khanmohammadi y Azam Heidari. "Adsorption of cefixime from aqueous solutions using modified hardened paste of Portland cement by perlite; optimization by Taguchi method". Water Science and Technology 74, n.º 5 (14 de junio de 2016): 1069–78. http://dx.doi.org/10.2166/wst.2016.230.

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In the present study, we have used a simple and cost-effective removal technique by a commercially available Fe-Al-SiO2 containing complex material (hardened paste of Portland cement (HPPC)). The adsorbing performance of HPPC and modified HPPC with perlite for removal of cefixime from aqueous solutions was investigated comparatively by using batch adsorption studies. HPPC has been selected because of the main advantages such as high efficiency, simple separation of sludge, low-cost and abundant availability. A Taguchi orthogonal array experimental design with an OA16 (45) matrix was employed to optimize the affecting factors of adsorbate concentration, adsorbent dosage, type of adsorbent, contact time and pH. On the basis of equilibrium adsorption data, Langmuir, Freundlich and Temkin adsorption isotherm models were also confirmed. The results showed that HPPC and modified HPPC were both efficient adsorbents for cefixime removal.
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Kurniawati, Shofi y Nurma Yunita Indriyanti. "Adsorption of Anionic and Cationic Dyes in Batik Wastewater Using Biomass Adsorbents: Literature Review". JKPK (Jurnal Kimia dan Pendidikan Kimia) 6, n.º 3 (25 de diciembre de 2021): 274. http://dx.doi.org/10.20961/jkpk.v6i3.55409.

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<p>This literature review aims to determine: 1. the content of chemical compounds in biomass waste, 2. the modification methods of biomass waste to be used as an adsorbent, 3. the suitable parameters for adsorbing anionic and cationic dyes. This literature review was conducted by Seven Steps Comprehensive Literature Review and reviewed 41 articles with the filtration processes. First, the search results using certain keywords in the Google Scholar database obtained 449 articles. Selection by year of publication (2016-2020), becomes 295 articles. Selection by duplicate and irrelevant articles, becomes 56 articles. Selection by publication type, becomes 47 articles. Lastly, full-text article screening becomes 41 articles. The results of this literature review show that: 1. Sources of biomass adsorbents include tea waste, peanut shells, cassava dregs, cassava peels, oil palm empty bunches, coffee grounds, corn cobs and coconut shavings. The content of chemical compounds in biomass waste include cellulose, hemicellulose and lignin. The highest content of cellulose was found in peanut shells at 63,5%; hemicellulose was in coffee grounds at 40,55%; and lignin was in wood shavings at 17-35%. The content of cellulose in the adsorbent source affects the adsorption ability of the adsorbent produced. 2. The modification methods of biomass adsorbent include carbonization, physical and chemical activation, and nanocomposites. The adsorption capacity of the adsorbents made by the carbonization-activation, chemical activation, and nanocomposite manufacturing method are 102,77 – 332,6 mg/g; 26,67 – 236,6 mg/g; and 12,42 mg/g, respectively. 3. Parameters that affect the adsorption of anionic and cationic dyes are pH, contact time, adsorbent mass, and initial concentration of the adsorbate solution. The optimum conditions for anionic dyes adsorption by biomass adsorbents occurred at pH 2-4, contact time 30 – 40 minutes, 0,1 – 0,2 g of adsorbent mass, and initial concentration 80 – 100 mg/L. While the optimum conditions for cationic dyes adsorption occurred at pH 5-9, contact time 60 – 90 minutes, 0,2 – 0,3 g of adsorbent mass, and initial concentration 100 – 120 mg/L.</p>
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Zahro, Septi Fatimatus y Sandyanto Adityosulindro. "Literature Review: Penggunaan Bahan Berbasis Limbah Sebagai Adsorben untuk Degradasi Zat Warna pada Air Limbah". Jurnal Kesehatan Lingkungan Indonesia 22, n.º 3 (15 de agosto de 2023): 359–68. http://dx.doi.org/10.14710/jkli.22.3.359-368.

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Latar belakang: Penggunaan adsorben bahan limbah dari limbah pertanian, industri maupun bahan alam menjadi alternatif baru dalam pengolahan air limbah yang mengandung zat warna. Limbah ini dapat menyebabkan berbagai masalah kesehatan bagi makhluk hidup mulai dari alergi, cidera permanen, asma, bahkan kanker. Tujuan review artikel ini adalah untuk memberikan informasi tren penelitian penggunaan adsorben dari bahan limbah dalam penyisihan zat warna serta informasi mengenai komposisi bahan, dan pengaplikasiannya sebagai potensi alternatif baru bahan adsorben dalam pengolahan limbah.Metode: Metode dalam penulisan review artikel ini dengan metode PRISMA 2020 menggunakan PRISMA checklist melalui 27 identifikator yang telah disediakan. Seleksi artikel dilakukan dengan beberapa kriteria dari tahun publikasi, kata kunci, klasifikasi bahan adsorben, serta artikel tentang adsorpsi secara umum sebagai pendukung. Artikel jurnal terpilih dan sesuai dengan kebutuhan sebanyak 28 artikel kemudian dilakukan pengkajian serta pembahasan lebih lanjut.Hasil: Hasil review artikel yang dikaji sebanyak 50% artikel yang memanfaatkan limbah pertanian sebagai adsorben, 18% artikel memanfaatkan limbah industri, dan 32% artikel memanfaatkan bahan alam. Pengkajian dilakukan menyeluruh mengenai metode pembuatan adsorben, komposisi bahan adsorben, kemampuan adsorpsi, studi kinetika dan studi isotherm adsorpsi. Hasil kajian menunjukkan kemampuan adsorben bahan limbah sangat baik dengan efisiensi tertinggi hingga 99,95%. Metode pembuatan adsorben yang paling umum digunakan dengan aktivasi fisika. Model isotherm yang digunakan sebagian besar adalah Langmuir dengan kinetika adsorpsi pseudo orde kedua.Simpulan: Potensi pemanfaatan adsorben dari bahan limbah sangat besar, ditinjau dari persentase efisiensinya dan kelimpahan bahan baku. Dalam proses adsorpsinya dipengaruhi oleh kandungan bahan, luas permukaan, dan metode pembuatan adsorben. ABSTRACT Title: Literature Review: The Use of Waste Materials as Adsorbent for Degradation Dyes in WastewaterBackground: Industrial, agricultural, and natural dyes can now be treated with adsorbents. This wastewater can cause allergies, serious wounds, asthma, and cancer. This article review discusses current research trends in using waste materials as dye removal adsorbents and their composition and possible usage as new, alternative adsorbents in the waste treatment sector.Method: This article review used PRISMA 2020 with 27 identifiers and the checklist. Articles were selected by year, keywords, adsorbent material categorization, and adsorption in general. Following 28 article requirements, selected journal articles were researched and discussed.Result: The analysis of the articles found that 32% of the articles used natural materials, 18% of the articles used industrial waste, and 50% of the articles used agricultural waste as an adsorbent. The process for creating adsorbents, the make-up of adsorbent materials, adsorption capacity, kinetic studies, and adsorption isotherm studies were all thoroughly evaluated. The study's findings demonstrate that waste materials have excellent adsorbent properties, with the highest efficiency reaching up to 99.95%. Physical activation is the most widely used adsorbent preparation technique. Most of the isotherm models in use have pseudo-second order adsorption kinetics and are Langmuir.Conclusion: Given the percentage of efficiency and the abundance of raw materials, there is a very large potential for using adsorbents made from waste materials. The adsorbent's surface area, material composition, and manufacturing process all have an impact on the adsorption process.
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Furtado, Shirley y Ana M. B. Cantera. "BIOCATALYST-ADSORBANT SYSTEMS: A VIABLE ALTERNATIVE TO PROTEOLYTIC PROCESSES IN SOLUTION". Preparative Biochemistry & Biotechnology 32, n.º 3 (1 de enero de 2002): 217–37. http://dx.doi.org/10.1081/pb-120013470.

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Jung, Cho-long, Jeongmin Lim, Jae-Hyoung Park, Ka-Hyun Kim, Chi-Hwan Han y Yongseok Jun. "High performance dye sensitized solar cells by adding titanate co-adsorbant". RSC Advances 3, n.º 43 (2013): 20488. http://dx.doi.org/10.1039/c3ra42907e.

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Bouchelta, C., M. S. Medjram, S. Boudelaa, F. Ahmed Chekkat, Z. Marsa y N. Ramdane. "Valorisation d’un sous-produit végétal pour la production d’un matériau adsorbant". Matériaux & Techniques 99, n.º 4 (2011): 493–500. http://dx.doi.org/10.1051/mattech/2011045.

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Lamesch, P. "Molecular adsorbant recirculating system (MARS® in patients with liver failure". Journal of Hepatology 34 (abril de 2001): 49. http://dx.doi.org/10.1016/s0168-8278(01)80162-8.

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Lamesch, P. Alfred, U. Jost, I. Geissler, J. Fangmann y J. Hauss. "Molecular adsorbant recirculating system (MARS®) in patients with liver failure". Journal of Hepatology 34 (abril de 2001): 49. http://dx.doi.org/10.1016/s0168-8278(01)81037-0.

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Yuliana, Y., Veronica J. S y Bambang Gunantara. "Penggunaan adsorben untuk mengurangi kadar free fatty acid, peroxide value dan warna minyak goreng bekas". Jurnal Teknik Kimia Indonesia 4, n.º 2 (2 de octubre de 2018): 212. http://dx.doi.org/10.5614/jtki.2005.4.2.4.

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This research was carried out to examine the ability of calcium silicate, magnesium silicate, activated carbon and bentonite as adsorbent to decrease the FFA content, PV and dark color intensitv of used frying oil. Adsorbent treatment may improve the quality and extend the frying life of used frying oil. A mixture of used frying oil and certain adsorbent were agitated at constant temperature 150oC for 1 hour Four adsorbents were used at various concentrations. Subsequently, the oil was filtered by vacuum filtration, The changes in FFA content, PV and color intensity were observed. Calcium silicate, magnesium silicate, activated carbon and bentonite could be used as a good adsorbent to reduce the FFA content, PV and dark color intensity of the usedfryng oil. Calcium silicate was more effective than the other adsorbents in reducing the FFA content and PV of the oil. Activated carbon and magnesium silicate showed about the same ability in removing dark color components, and its ability is better than calcium silicate and bentonite. Keywords: Vegetable Oil,Adsorbents, FFA, PV, Color AbstrakPada penelitian ini dipelajari kemampuan kalsium silikat, magnesium silikat, karbon aktif dan bentonit sebagai adsorben untuk menurunkan kadar asam lemak bebas (FFA), bilangan peroksida (PV), dan warna gelap minyak goreng bekas. Pengolahan dengan adsorben ini diharapkan dapat meningkatkan kualitas minyak goreng bekas sehingga umur pemakaian minyak goreng dapat diperpanjang. Minyak goreng bekas dan adsorben diaduk pada suhu konstan I50oC selama 1 jam dengan variasi konsentrasi dan jenis adsorben. Setelah itu minyak goreng disaring dengan vakum dan diamati perubahan kadar FFA, P, V, dan warna yang terjadi. Kalsium silikat, magnesium silikat, karbon aktif dan bentonit dapat berfingsi sebagai adsorben yang baik untuk mengurangi kadar FFA, PV dan warna minyak goreng bekas. Kalsium silikat lebih efektifuntuk penurunan kadar FFA dan PV dari pada ketiga adsorben yang lain. Karbon aktif dan magnesium silikat menunjukkan kemampuan mereduksi warna gelap minyak yang relatif hampir sama, tetapi lebih baik daripada kalsium silikat dan bentonit. Kata Kunci: Minyak Goreng, Adsorben, FFA, PV, Warna
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Schwantes, Daniel, Affonso Celso Gonçalves, Gustavo Ferreira Coelho, Marcelo Angelo Campagnolo, Douglas Cardoso Dragunski, César Ricardo Teixeira Tarley, Alisson Junior Miola y Eduardo Ariel Völz Leismann. "Chemical Modifications of Cassava Peel as Adsorbent Material for Metals Ions from Wastewater". Journal of Chemistry 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/3694174.

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Residues from the processing of cassava roots (Manihot esculentaCrantz), or cassava peels, are evaluated as chemically modified adsorbents with H2O2, H2SO4, and NaOH, in the removal of metal ions Cd(II), Pb(II), and Cr(III) from contaminated water. Modified adsorbents were chemically characterized for their chemical composition andpHPZC(point of zero charge), while adsorption tests determined the best conditions of pH, adsorbent mass, and contact time between adsorbent and adsorbate in the process of removal of the metal ions. Isotherms obtained from the preliminary results were linearized by Langmuir’s and Freudlich’s models. The thermodynamic parameters, such asΔH,ΔG, andΔS, were also evaluated. The modifying solutions proposed were effective in the modification of adsorbents and resulted in high capacity sorption materials. Equilibrium time between adsorbent and adsorbate for the solutions contaminated with metals is about 40 minutes. The Langmuir model adjusted to most results, indicating monolayers adsorption of Cd(II), Pb(II), and Cr(III). The values obtained for LangmuirQmshow a higher adsorption capacity caused by chemical modifications, with values such as 19.54 mg Cd(II) per g of M. NaOH, 42.46 mg of Pb(II) per g of M. NaOH, and 43.97 mg of Cr(III) per g of M H2O2. Results showed that modified cassava peels are excellent adsorbent, renewable, high availability, and low-cost materials and a feasible alternative in the removal of metals in industries.
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Aghdam, Ehsan, Majid Baghdadi y Mohammad Alizadeh Fard. "Removal of BTEX from aqueous solutions by paper mill sludge-based activated carbon". JOURNAL OF ADVANCES IN CHEMISTRY 11, n.º 1 (9 de enero de 2015): 3416–32. http://dx.doi.org/10.24297/jac.v11i1.6688.

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The removal of BTEX (benzene, toluene, ethyl-benzene and p-xylene) from contaminated groundwater was evaluated by paper mill sludge-based activated carbon, prepared by chemical activation and pyrolysis.The effects of pH, time, adsorbent dosage and adsorbate concentration were studied through batch adsorption experiments. Selected physical and chemical characteristics of the adsorbents, such as specific surface area (613m2/g), pore volume distribution (micropore: 277cm3/g, mesopore: 365cm3/g) and surface functional groups (carboxylic, alkyl and aliphatic groups) were determined by N2 adsorption-desorption diagram and FTIR, respectively. The removal efficiency of the four target compounds would be more than 92 %, which the initial concentrations of BTEX and the adsorbent dosage were 40 mg/l and 1000 mg/l, respectively. It was proved that pH and ionic strength have insignificant effects on the adsorption efficiency. The order of adsorption amount in all experiments was > ethyl-benzene > toluene > benzene. The kinetic data proved a closer fit to the pseudo-first-order model. The isotherm experimental data showed a better fit to either Freundlich or Langmuir model. In addition, a series of experiments was conducted to evaluate the capacity of the adsorbent in adsorbing the BTEX from a groundwater sample contaminated with gasoline.
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Grajek, Henryk. "Regeneration of Adsorbents by the Use of Liquid, Subcritical and Supercritical Carbon Dioxide". Adsorption Science & Technology 18, n.º 4 (mayo de 2000): 347–71. http://dx.doi.org/10.1260/0263617001493486.

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The literature concerning the adsorption and desorption of environmental impurities from adsorbents by means of liquid, subcritical and supercritical carbon dioxide and the author's work on the subject have been reviewed. The influence of the adsorption and desorption temperature, the pressure and the density of the extraction solvent, the solubility of the adsorbate in the extraction solvent, the activation energy for adsorbate desorption and the particle size of the adsorbent on the adsorbate desorption efficiency by this method were discussed.
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Putra, Rakha Handika, Bayu Satiyawira, Havidh Pramadika, Samsol y Sigit Rahmawan. "ADSORPSI PADA AMPAS TEBU DAN BENTONITE DALAM EMULSI MINYAK DALAM AIR DI LIMBAH AIR TERPRODUKSI". PETRO:Jurnal Ilmiah Teknik Perminyakan 11, n.º 1 (30 de junio de 2022): 12–17. http://dx.doi.org/10.25105/petro.v11i1.10232.

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Pada Air Formasi atau Air yang terproduksi sangat banyak terjadi hal yang membuat pencemaran lingkungan terjadi. Maka dari ini dapat diatasi salah satunya melalui proses adsorpsi. Tujuan dari penelitian ini adalah untuk menguji penghilangan minyak emulsi minyak dalam air dengan menggunakan Adsorben berupa karbon aktif. Adsorbsi ini menggunakan Ampas Tebu dan Bentonit, sehingga dapat menjadi langkah optimasi untuk penyerapan minyak. Beberapa tahapan yang telah dilakukan dalam penelitian ini adalah pembuatan karbon aktif yang terdiri dari proses dehidrasi, karbonisasi, dan aktivasi menggunakan variasi konsentrasi Aktivator. Hasil Penelitian memberikan bukti bahwa kemampuan daya serap adsorben untuk menyerap minyak telah dipengaruhi oleh beberapa faktor yaitu Pengaruh waktu kontak, berat adsorben, dan konsentrasi adsorbat pada adsorpsi minyak. Dari hasil ini persentase pada penghilangan minyak yang teradsorpsi dengan bertambahnya waktu kontak dan berat adsorben, serta kemampuan serapan pada adsorban terhadap adsorbat. Pada Studi ini menunjukan bahwa Isoterm Freundlich dan Langmuir adalah isoterm yang cocok untuk menghilangkan minyak dalam Air dengan proses Adsorpsi menggunakan Ampas Tebu dan Bentonit.
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OLUFEMI, BABATOPE y EMEKA NNANNA. "ADSORPTION OF NICKEL (II) IONS FROM SOLUTION USING SAWDUST AND MODIFIED SAWDUST". Journal of Engineering Studies and Research 28, n.º 2 (1 de septiembre de 2022): 62–72. http://dx.doi.org/10.29081/jesr.v28i2.007.

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By varying adsorbate concentration, temperature, contact time, pH, and adsorbent weight, the capacity of non-modified (NM) and modified (M) sawdust adsorbents to adsorb Ni2+ ions were studied in this work. The adsorption of Ni (II) ions rose as the adsorbent weight increased but reduced as the adsorbate concentration increased. Adsorption was greatest at pH 6, with the NM and M adsorbents removing 95.09 and 96.95% of Ni2+ ions, respectively. The highly dependent nature of the percent removal on operational variables was established by employing Analysis of Variance (ANOVA) as well as the Bonferroni-Holm Posthoc statistical test relationship significance. It was discovered that the NM and M sawdust are adequate adsorbents in removing Ni2+ cations from its solution. Freundlich, Langmuir, Temkin and Dubinin Raduschkevich (DR) isotherms were applied to match the sorption data. The adsorption of the two biosorbents was best characterized by the Freundlich isotherm model. Chemisorption was suspected based on the energy values obtained from the Temkin and DR isotherms. The second order kinetics best fit both the NM and M adsorption activities. The ability to absorb Ni (II) ions is impressive.
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Borghol, Yasser,, Mohamed Y. El-Kady, Mostafa H. Khalil, Mohamed El-Malky y Amar A. Abd Elatif. "USING OF DATE PALM LEAF MIDRIB BIOCHAR AS AN ADSORBANT IN WATER TREATMENT". Journal of Environmental Science 48, n.º 3 (1 de diciembre de 2019): 1–20. http://dx.doi.org/10.21608/jes.2019.160146.

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., S. V. Maruti Prasad. "A NOTE ON NATURAL ADSORBANT (MORINGA OLEIFERA) AS ANTIMICROBIAL AGENT IN WATER PURIFICATION". International Journal of Research in Engineering and Technology 03, n.º 07 (25 de julio de 2014): 57–60. http://dx.doi.org/10.15623/ijret.2014.0307011.

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Fu, Yong. "The Forming Mechanism of a New Oil-Mineral Aggregate". Advanced Materials Research 211-212 (febrero de 2011): 1176–81. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.1176.

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A new Oil-Mineral Aggregate with bentonite and calsium hydroxide and sawdust has been done. Through several dozens of experiments, the coagulation efficiency with bentonite and Ca(OH)2 and sawdust is 94.53%. The functions of bentonite are coagulation, adsorption and emulsification. Calsium hydroxide is a good coagulant-mate, and strengthen the coagulating function of bentonite. It can be used as the source of calcium ions, which can strongly adsorb on both bentonite and oil droplets, and is helpful for the coagulation between bentonite and oil droplets. Sawdust is also very important in the OMA, its fouctions are buoyant, bridge-made and adsorbant.
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Hadnadjev-Kostic, Milica, Tatjana Vulic, Djurdjica Karanovic y Marija Milanovic. "Advanced dye removal by multifunctional layered double hydroxide based materials: Adsorption and kinetic studies". Journal of the Serbian Chemical Society, n.º 00 (2022): 34. http://dx.doi.org/10.2298/jsc220228034h.

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Due to favourable properties layered double hydroxides (LDHs) have been widely investigated for organic dye removal processes. In order to study the adsorption of Methyl orange, bimetal (ZnAl and MgAl) and trimetal (ZnCuAl and MgCuAl) adsorbents were synthesized and thermally treated. The influence of adsorbent metal nature and content on structural (XRD, Raman analysis), textural (low temperature nitrogen adsorption) and adsorption properties was investigated. Adsorption behaviour, mechanisms, and stability of synthesized LDHs and their calcined mixed oxides were studied with the aim to elucidate the adsorbent-dye interactions, enabling optimization of experimental design. All LDH adsorbents and LDH derived mixed oxide adsorbents had high removal efficiency rate, especially Zn-containing mixed oxides where complete decolourization (100 % of dye removal) was achieved almost instantly due to super-fast adsorbent-adsorbate interaction. Two possible adsorption mechanisms initiated by interfacial phenomena were in correlation with the structural and textural properties, as well as with the ?memory effect? reconstruction phenomenon. These results present a solid base for further investigation and design of LDH-based adsorbents for the Methyl orange removal, considering their favourable structural and textural properties and excellent adsorption capacities.
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Firmansyah, Dodiy. "Perbandingan Metode Adsorpsi Ion Au3+ Menggunakan Serat Daun Nanas Termodifikasi Natrium Hidroksida Dan Asam Asetat Di Desa Prabu Kecamatan Pujut Kabupaten Lombok Tengah". SainsTech Innovation Journal 1, n.º 1 (30 de septiembre de 2018): 20–23. http://dx.doi.org/10.37824/sij.v1i1.2018.19.

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Abstract Pineapple leaves have high cellulose content so they can be used as adsorbents. Modification of adsorbent was carried out to increase adsorption ability of pineapple leaf fiber. The research that has been carried out aims to compare the adsorption ability of adsorbent modified sodium hydroxide pineapple leaf fiber with citric acid modified pineapple leaf fiber. Tests using adsorption were carried out using BET and SEM tools to determine the surface area and pore size of the adsorbent for pineapple leaf fibers. The results showed that the addition of citric acid 0.6 mol / L and modification temperature of 80 ° C resulted in citric acid modified cellulose adsorbents having a larger surface area and pore size of 733.725 m2 / g and 162.17 Å compared to the addition of sodium hydroxide with pore size equal to 157.04 Å and a small surface area of ??695.419. Keywords: Peneapple leaves, Natrium hydroxide, ctric acid, ion Au3+ Abstrak Daun nanas memiliki kandungan selulosa yang tinggi sehingga dapat dimanfaatkan sebagai adsorben. Modifikasi adsorben dilakukan untuk meningkatkan kemampuan adsorpsi adsorben dari serat daun nanas. Penelitian yang telah dilakukan bertujuan untuk membandingkan kemampuan adsorpsi adsorben serat daun nanas termodifikasi natrium hidroksida dengan serat daun nanas termodifikasi asam sitrat. Uji menggunakan adsorpsi dilakukan dengan menggunakan alat BET dan SEM untuk menentukan luas permukaan dan ukuran pori adsorben serat daun nanas. Hasil penelitian menunjukkan penambahan asam sitrat 0,6 mol/L dan temperatur modifikasi 80°C menghasilkan adsorben selulosa termodifikasi asam sitrat memiliki luas permukaan dan ukuran pori yang lebih besar yaitu 733,725 m2/g dan 162,17 Å dibandingkan penambahan natrium hidroksida dengan ukuran pori sebesar 157,04 Å dan luas permukaan yang kecil yaitu 695,419. Kata Kunci: Serat daun Nanas, Natrium Hidroksida, Asam Sitrat, Ion Au3+
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Ugale, Vinayak D. y Amol D. Pitale. "A Review on Working Pair Used in Adsorption Cooling System". International Journal of Air-Conditioning and Refrigeration 23, n.º 02 (27 de mayo de 2015): 1530001. http://dx.doi.org/10.1142/s2010132515300013.

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Adsorption cooling system find its application in refrigeration, air conditioning, chiller, Ice making, etc. It uses thermal energy as driving force. Adsorption systems are environmental friendly (zero global warming potential and ozone depleting potential) and also eliminates use of compressor and minimize vibration problem. So it can be used as substitute for conventional vapor compression refrigeration system or vapor absorption system. The adsorption generally classified in two types as physical adsorption (due to weak van der waal forces) and chemical adsorption (chemical reaction between adsorbent and adsorbate form new molecules). The working pair of adsorber and adsorbate play vital role in the performance of adsorption system. Activated carbon, zeolite, silica gel are commonly used adsorber and water, ammonia, methanol and ethanol can be used as adsorbate. The poor heat and mass transfer performance of adsorption is major challenge for researchers. The heat transfer performance of adsorption system can be increased by increasing heat transfer area of adsorber bed i.e., design of new adsorber bed, while mass transfer performance is improved by use of new adsorbent with higher sorption rate. Composite adsorber solve the problem of heat and mass transfer performance of chemical adsorbents and adsorption quantity of physical adsorbents by combination of chemical and physical adsorbent but it can add some limitation with it. In this paper, various adsorption pair, their selection, design of adsorber bed, methods to improve thermal performance of adsorber bed is reviewed with their properties, advantages and limitations.
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Priyanto, Ade, Malik F, Muhdarina Muhdarina y Awaluddin A. "Adsorption and Characterization of Activated Sugarcane Bagasse Using Natrium Hydroxide". Indo. J Chem. Res. 8, n.º 3 (31 de enero de 2021): 202–9. http://dx.doi.org/10.30598//ijcr.2021.7-ade.

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Sugarcane Bagasse can be used as an adsorbent both under natural conditions and modified by chemical activation using sodium hydroxide (NaOH). Activation of sugarcane bagasse with NaOH was carried out at variations of 5:1, 10:1, and 20:1 (w/w). The absorption ability of bagasse adsorbent to methylene blue solution was carried out with the parameters of variation of contact time (60, 90, 120, 150, and 180 minutes), adsorbate concentration (20, 30, 40, 50, and 60 ppm) and temperature (30, 40, 50, and 60 oC). The adsorbent's characterization included determining the functional groups using FTIR, morphology, and mass of elements using SEM-EDX, and determining the surface area and volume of adsorbent pores using the BET methods. The highest adsorption percentage results were found in the NASB10:1 adsorbent at 99.50%. The optimum conditions for the NASB10:1 adsorbent are with a contact time of 120 minutes, an adsorbate concentration of 50 ppm, and a temperature of 30 oC or 303 K. The NASB10:1 adsorbent has the highest surface area compared to other adsorbents, namely 2.803 m2/g so that it can perform the maximum absorption of methylene blue.
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El Bouaidi, Widad, Ghizlane Enaime, Mohammed Loudiki, Abdelrani Yaacoubi, Mountasser Douma, Abdelaziz Ounas y Manfred Lübken. "Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects". Processes 10, n.º 7 (21 de junio de 2022): 1235. http://dx.doi.org/10.3390/pr10071235.

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The increasing occurrence of toxic cyanobacteria in water sources, driven by climate change and eutrophication, is of great concern worldwide today. Cyanobacterial blooms can negatively affect water bodies and generate harmful secondary metabolites, namely microcystins (MCs), which significantly impair water quality. Various adsorbents used for MC removal from water sources were assessed in this investigation. Activated carbon constitutes the most widely used adsorbent for treating contaminated waters due to its high affinity for adsorbing MCs. Alternative adsorbents have also been proposed and reported to provide higher efficiency, but the studies carried out so far in this regard are still insufficient. The mechanisms implicated in MC adsorption upon different adsorbents should be further detailed for a better optimization of the adsorption process. Certainly, adsorbent characteristics, water pH and temperature are the main factors influencing the adsorption of MCs. In this context, optimization studies must be performed considering the effectiveness, economic aspects associated with each adsorbent. This review provides guidelines for more practical field applications of the adsorption in the treatment of waters actually contaminated with MCs.
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Fabre, B., J. Ayele, M. Mazet y P. Lafrance. "Adsorption du pentachlorophenol sur divers matériaux : Influence de co-adsorbats organiques (Substances humiques et lindane)". Revue des sciences de l'eau 3, n.º 3 (12 de abril de 2005): 277–92. http://dx.doi.org/10.7202/705075ar.

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Nous avons réalisé, pour de faibles concentrations, l'étude de l'adsoprtion d'un pesticide le pentachlorophénol, sur plusieurs matériaux adsorbants : le charbon actif, la kaolinite et la bentone. Les résultats montrent que l'adsorption du pentachlorophénol sur la kaolinite reste négligeable tandis que la bentone SD-3 (argile traitée) permet d'obtenir des résultats intéressants avec toutefois une capacité maximale d'adsorption 10 à 100 fois plus faible que celle du charbon actif. Le charbon actif reste le meilleur matériau adsorbant pour le pentachlorophénol. La solubilité de ce composé étant très variable en fonction du pH du milieu on constate que l'adsorption du pentachlorophénol-pentachlorophénate (5 mg.l-1) diminue pour des valeurs de pH supérieures au pKa du couple acide-base que nous avons déterminé expérimentalement, égal à 5,9 ± 0,1. L'adsorption du pentachlorophénol n'est pas affectée par la présence d'acides humiques (obtenus à partir de substances commerciales) utilisés comme coadsorbats (10 mg.l-1) alors que les acides fulviques (20 mg.l-1) extraits de sols semblent provoquer une promotion de l'adsorption. On observe d'autre part que le pentachlorophénol n'affecte pas l'adsorption des acides humiques mais augmente légèrement celle des acides fulviques. Ces remarques suggèrent la possible formation d'un complexe acides fulviques-pentachlorophénol. Lorsqu'on utilise le lindane, pesticide hydrophobe comme coadsorbat (165 mg.l-1), on observe encore d'une façon systématique pour tous les nombreux essais une légère promotion de l'adsorption.
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41

Ngernyen, Yuvarat, Atip Laungphairojana, Thitima Nikronsangkhaphinit y Sinsupa Kaewketkam. "The Utilization of Boiler Fly Ash for Treatment of Wastewater Color by Adsorption Process: Case Study for Pulp and Paper Industry". Key Engineering Materials 718 (noviembre de 2016): 87–94. http://dx.doi.org/10.4028/www.scientific.net/kem.718.87.

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This research aimed to investigate the possibility of utilizing coal fly ash and eucalyptus fly ash from boilers in pulp and paper industry as adsorbents for color removal of biological treated wastewater. The physical properties of fly ash such as pore properties (surface area, pore volume and average pore size), thermal degradation and functional group were analyzed. The results showed that both types of fly ash were mesopore adsorbents. The percentage of color removal increased with the increasing of amount of adsorbent. The maximum percentage of color removal for amount of adsorbent at 0.5, 1, 1.5 and 2 g are 76%, 86%, 90% and 94%, respectively. The adsorption reaches equilibrium at 48 hours for all experiments. The adsorbents were reused and the experiments showed that the adsorbent can be reused twice without any regeneration before the percentage of color removal went below the target number of industry at 58%. The scale up of adsorption process was also studied. The experimental results showed that increasing amount of adsorbent and adsorbate 2 to 10 times do not have any significant effect on the percentage of color removal. The coal fly ash yielded higher percentage of color removal (90%) than eucalyptus fly ash (82%).
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42

Shkolin, Andrey, Il’ya Men’shchikov, Elena Khozina y Anatolii Fomkin. "In Situ Dilatometry Measurements of Deformation of Microporous Carbon Induced by Temperature and Carbon Dioxide Adsorption under High Pressures". Colloids and Interfaces 7, n.º 2 (13 de junio de 2023): 46. http://dx.doi.org/10.3390/colloids7020046.

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Adsorption-based carbon dioxide capture, utilization, and storage technologies aim to mitigate the accumulation of anthropogenic greenhouse gases that cause climate change. It is assumed that porous carbons as adsorbents are able to demonstrate the effectiveness of these technologies over a wide range of temperatures and pressures. The present study aimed to investigate the temperature-induced changes in the dimensions of the microporous carbon adsorbent Sorbonorit 4, as well as the carbon dioxide adsorption, by using in situ dilatometry. The nonmonotonic changes in the dimensions of Sorbonorit 4 under vacuum were found with increasing temperature from 213 to 573 K. At T > 300 K, the thermal linear expansion coefficient of Sorbonorit 4 exceeded that of a graphite crystal, reaching 5 × 10−5 K at 573 K. The CO2 adsorption onto Sorbonorit 4 gave rise to its contraction at low temperatures and pressures or to its expansion at high temperatures over the entire pressure range. An inversion of the temperature dependence of the adsorption-induced deformation (AID) of Sorbonorit-4 was observed. The AID of Sorbonorit-4 and differential isosteric heat of CO2 adsorption plotted as a function of carbon dioxide uptake varied within the same intervals of adsorption values, reflecting the changes in the state of adsorbed molecules caused by contributions from adsorbate–adsorbent and adsorbate–adsorbate interactions. A simple model of nanoporous carbon adsorbents as randomly oriented nanocrystallites interconnected by a disordered carbon phase is proposed to represent the adsorption- and temperature-induced deformation of nanocrystallites with the macroscopic deformation of the adsorbent granules.
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43

Sankar, Subhashini y E. Kowsalya. "Reduction of Dye component level by using the waste based materials- Groundnut shell powder and Neem seed powder". IOP Conference Series: Earth and Environmental Science 1125, n.º 1 (1 de diciembre de 2022): 012006. http://dx.doi.org/10.1088/1755-1315/1125/1/012006.

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Abstract Methylene blue dye discharged from the textile industries is a thiazine dye which is toxic and non-degradable chemical. Activated carbon is mostly used adsorbent to effectively remove Methylene blue from industrial waste waters. Low-cost adsorbents like groundnut shell powder and neem powder were used for the dye component level present in a solution as batchmode treatment for the Methylene blue concentration of 200mg/litre and fixed adsorbent concentration of 0.5 grams Adsorbent I (Neem seed powder) have an excellent adsorption capacity of 85% where as for the same process condition, Adsorbent II (Groundnut shell powder) showed only 15% adsorption. The Effect of contact time on Adsorbate (Methylene blue) concentration removal data obtained for the both adsorbent I & II shows linear increase of percent removal capacity. For adsorbent I it shows maximum of 95% in 100min for adsorbent II 80 % is the maximum Percent removal.
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44

Idongesit O Ekpenyong, Effiong J Okon, Kufre E Essien y Okon E Okon. "Adsorption of Pb2+ from waste water using modified and unmodified plantain pseudo stem waste as adsorbent". International Journal of Science and Research Archive 3, n.º 1 (30 de agosto de 2021): 093–96. http://dx.doi.org/10.30574/ijsra.2021.3.1.0020.

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This study was carried out to evaluate the potentials of plantain pseudo stem waste as adsorbent in the removal of Pb2+ from aqueous solution. Filament obtained from Plantain pseudo stem were dried, cut into chips and ground using electric grinder. The powdered sample obtained was soaked in ethanol for 24 hours and wash with water several times to remove the extractive component. It was then dried in the oven. Modification reaction was carried out on the powdered sample using Fenton reagent (Fe2+/H2O2). Both the modified and unmodified adsorbents were used for the adsorption of Pb2+ from aqueous solution. Factors considered were effect of contact time and effect of adsorbate (Pb2+) concentrations. The results revealed that in all the adsorption studies, the adsorption capacity of modified adsorbent was higher than that of the unmodified adsorbent. However, adsorption capacities increase with increase in contact time and decreases with increase in the adsorbate concentration.
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45

Abu Tahari, Maratun Najiha, Azizul Hakim, Wan Nor Roslam Wan Isahak, Wan Zurina Samad y Mohd Ambar Yarmo. "Adsorption of CO2 on Octadecylamine-Impregnated on SiO2: Physical and Chemical Interaction Studies". Advanced Materials Research 1087 (febrero de 2015): 137–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.137.

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Silica dioxide (SiO2) can be modified by impregnating amine-containing compound to improve CO2 adsorption capacity. Octadecylamine (ODA) was supported on silica dioxide particles. The amine-modified samples were characterized using FTIR, BET and XRD. Carbamate ion pair formation on surface of adsorbents was analyzed by XPS. Reactivity of solid sorbents towards CO2 was evaluated using isothermal CO2 adsorption by BET. This study shows 25 wt % ODA/SiO2 can adsorb 2.45 wt % CO2/adsorbent is slightly higher in adsorbing CO2 compared to pure SiO2 which only adsorb 1.85 wt % CO2/adsorbent.
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46

Njewa, Joel Brian, Timothy Tiwonge Biswick, Ephraim Vunain, Cheruiyot Silas Lagat y Solomon Omwoma Lugasi. "Synthesis and Characterization of Activated Carbon from Agrowastes for the Removal of Acetic Acid from an Aqueous Solution". Adsorption Science & Technology 2022 (6 de junio de 2022): 1–13. http://dx.doi.org/10.1155/2022/7701128.

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In this study, activated carbons prepared from agrowastes by chemical activation were used to remove acetic acid from an aqueous solution through a batch process. The prepared adsorbents were characterized by SEM, XRD, FT-IR, and point of zero charge (pHpzc). The effects of adsorbent dosage, initial concentration, and contact time were considered. Equilibrium data was tested using Langmuir, Freundlich, Temkin, and Frenkel–Halsey–Hill models. The degree of adsorption of acetic acid increased for both adsorbents as contact time, and adsorbent dosage and initial concentration were increased. The adsorption data were described well by the (Freundlich=Frenkel–Halsey–Hill) models with the highest regression coefficient of R 2 = 0.9961 and R 2 = 0.9951 for Rice Husk Activated Carbon (RH-AC) and Potato Peels Activated Carbon (PP-AC), respectively. This suggests a multilayer through the existence of a heterogeneous pore distribution in the adsorbent surface. Kinetic data agreed well with pseudosecond-order ( R 2 = 0.999 and R 2 = 0.994 ) RH-AC and PP-AC, correspondingly. This indicates that the adsorption process was chemisorption in nature. The regeneration studies showed that the adsorbents prepared could be renewed and reused before losing their adsorbing affinity for acetic acid.
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47

Oumam, M. "Elaboration et caractérisation d'un nouveau matériau adsorbant à partir des schistes bitumineux du Maroc". Annales de Chimie Science des Matériaux 28, n.º 4 (julio de 2003): 59–74. http://dx.doi.org/10.1016/s0151-9107(03)00096-5.

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48

Lalitha, Nagubandi. "Chromatographic Separation of Plant Pigments Using Sand as the Adsorbant: An Inexpensive Chromatographic Technique". Journal of Chemical Education 71, n.º 5 (mayo de 1994): 432. http://dx.doi.org/10.1021/ed071p432.

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49

Ratnayake, SP y H. Wingfors. "Determination of airborne PAHs using passive sampling with 2,6 diphenyl-p-phenylenoxide as adsorbant". Journal of the National Science Foundation of Sri Lanka 45, n.º 1 (24 de marzo de 2017): 83. http://dx.doi.org/10.4038/jnsfsr.v45i1.8043.

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50

Mandake, Manoj B., Santosh Walke, Makarand Naniwadikar, Ganesh Patil y Sandhya D. Jadhav. "Experimental Investigations of the Removal of Methylene Blue from Waste Water using Agricultural Adsorbant". Int. J. of Membrane Science and Technology 10, n.º 1 (20 de enero de 2023): 1–7. http://dx.doi.org/10.15379/2410-1869.2023.10.01.01.

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Abstract: The colored organic or inorganic chemical compounds which can impart colour to other substance are the Dyes which did significant applications in the most industrial sectors like the textile industry, leather industry, paper industry, plastic, foodstuff industry etc, to impart color to their products. Due to the large volume of dye use in these businesses, a significant quantity of wastewater containing colored organics is generated. Because of insufficient dye-fiber fixation, during the dyeing process, half of the dye is lost in the wastewater. Peanut and rice husk are used to absorb MB from water. Initial Methylene Blue concentration, Peanut and Rice Husk dose, and pH were monitored and compared to current adsorbents to identify the optimal removal conditions. The equilibrium amount of MB adsorbed at time t (min) for rice husk and peanut hull are obtained as 5.1 and 5.19 mg/g respectively. As part of the research, an intra-particle diffusion model was implemented to regulate the mass transfer model's rate-controlling step mechanism.
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