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Articoli di riviste sul tema "Tempkin"

Autore: Grafiati
Pubblicato: 7 settembre 2021
Ultima modifica: 29 luglio 2025

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1

Nguyen, Thu Hang. "Study on synthesis of magnetic aerogel material graphene-based for application in removing 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) in water." Vietnam Journal of Catalysis and Adsorption 14, no. 2 (2025): 27–32. https://doi.org/10.62239/jca.2025.020.

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A Fe3O4/Graphene aerogel (Fe3O4/GA) material was prepared successfully by a hydrothermal method. The material was characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FESEM/EDX), vibration sample magnetization (VSM) and Brunauer-Emmett-Teller (BET). The effects of initial 2,4,5-T acid concentrations, contact time, and pH values on the 2,4,5-T adsorption were investigated from batch tests. The experimental data were analyzed by four adsorption isotherm models: Freundlich, La
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2

Adolphe, Kouoh Sone Paul-Michel, Tagne Guy Merlain, Lekene Ngouateu René Blaise, et al. "Kinetics and equilibrium studies of the adsorption of nickel (II) ions from aqueous solution onto modified natural and synthetic iron oxide." International Journal of Basic and Applied Sciences 4, no. 3 (2015): 277. http://dx.doi.org/10.14419/ijbas.v4i3.4721.

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<p>The present paper reports on the kinetic and equilibrium studies of the adsorption of Nickel(II) ions from aqueous solution onto modified natural iron oxide (NAT) from Mbalam (East Region of Cameroon) and synthetic iron oxide (SYNTH). The parameters investigated using batch techniques include, the contact time, adsorbent mass, pH and initial metal ion concentration. The experimental results obtained showed that, the optimum pH of 6 for bothadsorbents with an equilibrium time of 30 minutes was sufficient. The kinetic data correlated well with the pseudo-first-order and pseudo-second-or
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3

Maguie, Kammegne Adelaide, Ndi Julius Nsami, Kouotou Daouda, Che Nangah Randy, and Ketcha Joseph Mbadcam. "Adsorption Study of the Removal of Copper (II) Ions using Activated Carbon Based Canarium Schweinfurthii Shells Impregnated with ZnCl2." IRA-International Journal of Applied Sciences (ISSN 2455-4499) 8, no. 1 (2017): 18. http://dx.doi.org/10.21013/jas.v8.n1.p2.

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<p>The adsorption of Cu2+ions on activated carbon based canarium schweinfurthii impregnated with ZnCl2 was studied. The shells of canarium schweinfurthii were impregnated with ZnCl2 at varying ZnCl2 concentrations, temperature, residence time while keeping the heating rate fixed at 10 °C / min and the ratio of impregnation of 1:1. The activated carbon with the highest surface area in term of iodine number of 860,817 mg/g, the highest methylene blue of 741,6 mg/g and 74,66 % of yield of carbon was obtained at 650 °C, 60 % ZnCl 2 and 30min. From the batch adsorption studies, the equilibriu
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4

Zazouli, Mohammad Ali, Ali Azari, Samaneh Dehghan, and Razieh Salmani Malekkolae. "Adsorption of methylene blue from aqueous solution onto activated carbons developed from eucalyptus bark and Crataegus oxyacantha core." Water Science and Technology 74, no. 9 (2016): 2021–35. http://dx.doi.org/10.2166/wst.2016.287.

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In this study, eucalyptus bark and Crataegus oxyacantha core-based activated carbon were synthesized and their morphological features characterized by scanning electron microscopy and Fourier transform infrared spectroscopy techniques. The efficiency of synthesized adsorbents in removal of methylene blue (MB) from aqueous solution was investigated in a series of batch experiments. Furthermore, the influences of various experimental factors involving the contact time, the initial dye concentration, the adsorbent dosage, and the pH of the dye solution were investigated. The point of zero charge
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5

Ruthiraan, M., E. C. Abdullah, N. M. Mubarak, and Sabzoi Nizamuddin. "Adsorptive Removal of Methylene Blue Using Magnetic Biochar Derived from Agricultural Waste Biomass: Equilibrium, Isotherm, Kinetic Study." International Journal of Nanoscience 17, no. 05 (2018): 1850002. http://dx.doi.org/10.1142/s0219581x18500023.

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Wastewater discharge from textile industries contribute much to water pollution and threaten the aqua ecosystem balance. Synthesis of agriculture waste based adsorbent is a smart move toward overcoming the critical environmental issues as well as a good waste management process implied. This research work describes the adsorption of methylene blue dye from aqueous solution on nickel oxide attached magnetic biochar derived from mangosteen peel. A series of characterization methods was employed such as FTIR, FESEM analysis and BET surface area analyzer to understand the adsorbent behavior produc
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6

Ankoro, Naphtali Odogu*, Daouda Kouotou, Belibi Placide Desiré Belibi, Julius Nsami Ndi, and Joseph Mbadcam Ketcha. "REMOVAL OF INDIGO CARMINE DYE (IC) BY BATCH ADSORPTION METHOD ONTO DRIED COLA NUT SHELLS AND ITS ACTIVE CARBON FROM AQUEOUS MEDIUM." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 3 (2016): 874–87. https://doi.org/10.5281/zenodo.48382.

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Natural cola nut shells and its active carbons were used to remove indigo carmine dye from aqueous solution using batch adsorption test. The effect of pH, contact time (t), adsorbent dose (m) and initial concentrations (Co) were investigated. The equilibrium adsorption data were analyzed by Langmuir, Freundlich, Tempkin and Dubin-Kaganer-Raduskushkevich classical isotherm models. This equilibrium data best fits with all the four isotherm models for cola nut shells. Langmuir and Freundlich equations correlated well with data obtained using activated carbon based H3PO4 while Freundlich and Tempk
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7

Abul, Hossain Mohammad, Tanim-al Hassan, and Lokman Hossain. "Adsorption of Crystal Violet on Used Black Tea Leaves from Acidic Solution: Equilibrium, Thermodynamic and Mechanism Studies." International Journal of Sciences Volume 4, no. 2015-10 (2015): 31–39. https://doi.org/10.5281/zenodo.3349023.

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The present study investigates the potential use of used black tea leaves (UBTL) for the removal of Crystal Violet (CV) from acidic solution in batch process. The influences of different adsorption parameters such as contact time, concentration, processing temperatures and ionic strength were investigated. UV-visible spectrophotometer was used to analysis CV at a specific pH (6.0) of solution. Several model isotherms were depicted at different processing temperatures using acidic solution of pH 2.0. Langmuir, Freundlich, Tempkin, Dubinin-Radushkevich (D-R) and Florry-Huggins model equation wer
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8

Mousa, Souad Abd. "A Comparative Study of the Adsorption of Crystal Violet Dye from Aqueous Solution on Rice Husk and Charcoal." Baghdad Science Journal 17, no. 1(Suppl.) (2020): 0295. http://dx.doi.org/10.21123/bsj.2020.17.1(suppl.).0295.

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In this work, the adsorption of crystal violet dye from aqueous solution on charcoal and rice husk has been investigated, where the impact of variable factors (contact time; the dosage of adsorbent, pH, temperature, and ionic strength) have been studied. It has been found that charcoal and rice husk have an appropriate adsorption limit with regards to the expulsion of crystal violet dye from fluid arrangements. The harmony adsorption is for all intents and purposes accomplished in 45 min for charcoal and 60 min for rice husk. The amount of crystal violet dye adsorbed (0.4 g of charcoal and 0.5
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9

Tg. Mohd Zamri, Tengku Khamanur Azma, Mimi Sakinah Abd Munaim, and Zularisam Ab Wahid. "ADSORPTION AND KINETIC STUDIES OF A NATURAL DYE FROM CURCUMA LONGA L., ONTO BAMBOO YARN." Journal of Chemical Engineering and Industrial Biotechnology 2, no. 1 (2017): 13–26. http://dx.doi.org/10.15282/jceib.v2i1.3802.

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Natural dye extracted from the rhizome of Curcuma longa L. were applied to bamboo yarns using exhaustion dyeing process. This study investigates the dyeing behaviour of Curcumin; the major color component isolated from rhizomes of Curcuma longa L.on bamboo yarn. Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to test the adsorption process of curcumin on bamboo yarn. Comparison of regression coefficient value indicated that the Freundlich isotherm most fitted to the adsorption of curcumin onto bamboo yarn. Furthermore, the kinetics study on this research fitted
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10

Nasri, Noor Shawal, Jibril Mohammed, Muhammad Abbas Ahmad Zaini, Usman Dadum Hamza, Husna Mohd. Zain, and Farid Nasir Ani. "Equilibrium and Kinetic Studies of Benzene and Toluene Adsorption onto Microwave Irradiated-Coconut Shell Activated Carbon." Advanced Materials Research 1043 (October 2014): 219–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1043.219.

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Concern about environmental protection has increased over the years and the presence of volatile organic compounds (VOCs) in water poses a threat to the environment. In this study, coconut shell activated carbon (PHAC) was produced by potassium hydroxide activation via microwave for benzene and toluene removal. Equilibrium data were fitted to Langmuir, Freundlich and Tempkin isotherms with all the models having R2 > 0.94. The equilibrium data were best fitted by Langmuir isotherm, with maximum adsorption capacity of 212 and 238mg/g for benzene and toluene, respectively. The equilibrium para
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11

Priya, C. Geetha, and B. R. Venkatraman. "A STUDY ON THE ADSORPTION OF Ni(II) IONS FROM WASTEWATER USING ACID ACTIVATED ANISOMELES MALABARICA LEAVES." Journal of Advanced Scientific Research 12, no. 03 (2021): 82–88. http://dx.doi.org/10.55218/jasr.202112345.

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In the present investigation, the efficiency of activated carbon prepared from Anisomeles malabarica leaves (AMC) as an adsorbent for the removal of Ni (II) ion was investigated. Anisomeles malabarica leaves were treated with sulphuric acid before adsorption. The influence of various operating conditions such as adsorbent dosage, initial concentration of adsorbate, contact time, pH and temperature were explored in a Batch adsorption technique. The Langmuir, Freundlich and Tempkin isotherm models were used to compute the experimental outcomes. Freundlich Isotherm model were fitted well than tha
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12

Ramasamy, Sharmila, Anbarasu Kaliyaperumal, and Thamilarasu Pommanaickar. "Adsorptive Studies for the Removal of Crystal Violet Dye from Aqueous Solution by Using Cicca Acida L. Stem - Activated Carbon." Current World Environment 16, no. 2 (2021): 436–43. http://dx.doi.org/10.12944/cwe.16.2.10.

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Textile industries discharge wastewater containing various dyes including Crystal Violet dye. These dyes are very harmful for human beings, animals and plants. Therefore, the attempt is made for adsorption framework on elimination of crystal violet dye by using Cicca acida L. stem-activated carbon from aqueous solution carried out under various experimental methods and optimization conditions. Adsorption data modeled with Freundlich, Langmuir and Tempkin adsorption isotherms. Thermodynamic factors like as ∆Ho, ∆So and ∆Go were calculated, which indicated that the adsorption was spontaneo
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13

Ramasamy, Sharmila, Anbarasu Kaliyaperumal, and Thamilarasu Pommanaickar. "Adsorptive Studies for the Removal of Crystal Violet Dye from Aqueous Solution by Using Cicca Acida L. Stem - Activated Carbon." Current World Environment Special Issue, no. 1 (2021): 94–101. http://dx.doi.org/10.12944/cwe.16.special-issue1.09.

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Abstract (sommario):
Textile industries discharge wastewater containing various dyes including Crystal Violet dye. These dyes are very harmful for human beings, animals and plants. Therefore, the attempt is made for adsorption framework on elimination of crystal violet dye by using Cicca acida L. stem-activated carbon from aqueous solution carried out under various experimental methods and optimization conditions. Adsorption data modeled with Freundlich, Langmuir and Tempkin adsorption isotherms. Thermodynamic factors like as ∆Ho, ∆So and ∆Go were calculated, which indicated that the adsorption was spontaneo
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14

Lahreche, Saadia, Imane Moulefera, Abdelkader El Kebir, Lilia Sabantina, M’hamed Kaid, and Abdelghani Benyoucef. "Application of Activated Carbon Adsorbents Prepared from Prickly Pear Fruit Seeds and a Conductive Polymer Matrix to Remove Congo Red from Aqueous Solutions." Fibers 10, no. 1 (2022): 7. http://dx.doi.org/10.3390/fib10010007.

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The present work was aimed to evaluate the adsorption properties of activated carbons based on prickly pear seeds (PPS) and conductive polymer matrix based on polyaniline (PANI) for the removal of anionic Congo red (CR) dye from aqueous solutions. The adsorbent was prepared by polymerization of aniline in the presence of activated PPS by phosphoric acid and sodium hydroxide. The samples were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA)
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15

Kováčová, Zdenka, Štefan Demčák, and Magdaléna Bálintová. "Equilibrium isotherm studies of copper and zinc removal from model solutions using natural and alkaline treated hornbeam sawdust." Selected Scientific Papers - Journal of Civil Engineering 15, no. 2 (2020): 37–47. http://dx.doi.org/10.1515/sspjce-2020-0016.

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Abstract In the present study, sawdust an industrial by-product available in large quantities as sorbent material was studied. The removal adsorption capacity of Cu(II) and Zn(II) from aquatic solutions was obtained. The batch experiments were carried out to determine the effect of initial concentration of copper/zinc solution at pH=4.0 onto natural hornbeam and hornbeam modified with NaOH and KOH. The Fourier transform infrared spectroscopy (FTIR) determined the changes in functional groups after the modification of sawdust. The equilibrium data were fitted with four isotherm models - Langmui
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16

Theivarasu, C., and S. Mylsamy. "Removal of Malachite Green from Aqueous Solution by Activated Carbon Developed from Cocoa (Theobroma Cacao) Shell - A Kinetic and Equilibrium Studies." E-Journal of Chemistry 8, s1 (2011): S363—S371. http://dx.doi.org/10.1155/2011/714808.

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The removal of malachite green (MG) by cocoa (Theobroma cacao) shell activated carbon (CSAC) was investigated in present study. Adsorption studies were performed by batch experiments as a function of process parameters such as initial pH, contact time, initial concentration and adsorbent dose. A comparison of kinetic models applied to the adsorption of MG on CSAC was evaluated for the pseudo-first order and pseudo-second order kinetic models. Results showed that the pseudo-second order kinetic model was found to correlate the experimental data well. The experimental equilibrium adsorption data
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17

Rajeshkannan, R., M. Rajasimman, and N. Rajamohan. "Decolourization of malachite green using tamarind seed: Optimization, isotherm and kinetic studies." Chemical Industry and Chemical Engineering Quarterly 17, no. 1 (2011): 67–79. http://dx.doi.org/10.2298/ciceq100716056r.

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In this work, removal of malachite green (MG) from aqueous solution using a low cost adsorbent, tamarind seed, was investigated. The adsorbent was characterized using SEM, BET surface area analyzer, and FT-IR. Decolorization of malachite green was studied as a function of different adsorption parameters such as temperature, adsorbent dose, contact time, adsorbent size and agitation speed. These parameters were optimized using response surface methodology (RSM). The significance of different adsorption parameters along with their combined effect on the adsorption process has been established th
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18

Paz, Diego S., Alexandre Baiotto, Marcio Schwaab, et al. "Use of papaya seeds as a biosorbent of methylene blue from aqueous solution." Water Science and Technology 68, no. 2 (2013): 441–47. http://dx.doi.org/10.2166/wst.2013.185.

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In this study papaya seeds were used to remove methylene blue dye from aqueous solution. Papaya seeds were characterized as possessing a macro/mesoporous texture and large pore size. Studies were carried out in batches to evaluate the effect of contact time and pH (2–12) on the removal of dye. It was observed that the adsorption of dye was better in the basic region (pH 12). The equilibrium data were analyzed using Langmuir, Freundlich, Dubinin–Raduschkevich, Tempkin, Jovanovich, Redlich–Peterson, Sips, Toth and Radke–Prausnitz isotherms. The equilibrium data were best described by the Langmui
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19

Parimalam, R., V. Raj, and P. Sivakumar. "Removal of Acid Green 25 from Aqueous Solution by Adsorption." E-Journal of Chemistry 9, no. 4 (2012): 1683–98. http://dx.doi.org/10.1155/2012/197235.

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The adsorptive removal of Acid Green 25 byAnanas Comosus(L) Activated carbon was investigated in this study. The effects of initial dye concentration, contact time, pH and temperature were studied for the adsorption of Acid Green 25 in batch mode. At 100 mg/L of initial dye concentration the adsorbent removes 182.6 mg/g of dye from solution; it further increases on increasing the temperature. The calculated values of ∆G° indicate that the adsorption process is spontaneous, negative ∆H° indicate that the adsorption process is exothermic and the positive value of ∆S° indicates the increase in ra
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20

RAMAN, M. K., and G. MUTHURAMAN. "Temperature Effect in Adsorption of Blue HE-3R on Calendula officinalis: Isotherm, Kinetics and Thermodynamics." Asian Journal of Chemistry 31, no. 6 (2019): 1255–59. http://dx.doi.org/10.14233/ajchem.2019.21772.

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Adsorption of a textile reactive dye blue HE-3R was carried out with a low-cost adsorbent material i.e., Calendula officinalis. The batch adsorption experiment was done with respect to the effect of pH, concentration of dyes, adsorbent dose and contact time. All the experimental results were analyzed for the suitability of Isotherm models (Freundlich, Langmuir, Redlich-Peterson and Tempkin) and kinetic models (pseudo-first-order, pseudo-second-order, intra-particle diffusion and Elovich). Adsorption process follows Redlich-Peterson isotherm and Pseudo-second order kinetics. The maximum adsorpt
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21

Li, Fang, and Chunmei Ding. "Adsorption of Reactive Black M-2R on Different Deacetylation Degree Chitosan." Journal of Engineered Fibers and Fabrics 6, no. 3 (2011): 155892501100600. http://dx.doi.org/10.1177/155892501100600303.

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Different degree of deacetylation (DD) chitosan was prepared and used for the removal of a Reactive black M-2R (RBM) from aqueous solution. The effects of temperature (298 K~323 K), chitosan dosage, degree of deacetylation on RBM removal were investigated. The adsorption equilibrium was reached within one hour. In order to determine the adsorption capacity, the sorption data were analyzed by using linear form of Langmuir, Freundlich and Tempkin isotherm equation. Langmuir equation shows higher conformity than the other two equations. From the kinetic experiment data, it was found that the sorp
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22

Abdi, Sara, and Masoud Nasiri. "Removal of Fast Green FCF dye from aqueous solutions using Flower Gel as a low-cost adsorbent." Water Science and Technology 77, no. 5 (2017): 1213–21. http://dx.doi.org/10.2166/wst.2017.633.

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Abstract The purpose of this study was to investigate the removal of Fast Green FCF dye from aqueous solutions using Flower Gel in a batch adsorption process. The effect of different parameters such as pH, contact time, adsorbent dosage, stirrer speed and temperature were studied, and various isotherms including Langmuir, Freundlich and Tempkin were applied. The adsorbent characteristics were determined by microscopic analysis, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction and ultraviolet-visible (UV-vis) spectrophotometry. The results showed that the equilibrium experiment
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23

Jangra, Arti, Jaiveer Singh, Radhika Khanna, Parvin Kumar, Suresh Kumar, and Ramesh Kumar. "Comparative Studies of Dye Removal Efficiency of Surface Functionalized Nanoparticles with Other Adsorbents: Isotherm and Kinetic Study." Asian Journal of Chemistry 33, no. 12 (2021): 3031–38. http://dx.doi.org/10.14233/ajchem.2021.23471.

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In present work, the synthesis of the humic acid functionalized iron oxide nanoparticles and their application in water treatment are reported. The bare and humic acid functionalized iron oxide nanoparticles were characterized using different techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. The synthesized magnetite nanoparticles coated with humic acid showed efficient removal of crystal violet dye from the aqueous solution. The functionalized magnetite nanoparti
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24

Can, Mustafa. "Equilibrium, kinetics and process design of acid yellow 132 adsorption onto red pine sawdust." Water Science and Technology 71, no. 12 (2015): 1901–11. http://dx.doi.org/10.2166/wst.2015.164.

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Linear and non-linear regression procedures have been applied to the Langmuir, Freundlich, Tempkin, Dubinin–Radushkevich, and Redlich–Peterson isotherms for adsorption of acid yellow 132 (AY132) dye onto red pine (Pinus resinosa) sawdust. The effects of parameters such as particle size, stirring rate, contact time, dye concentration, adsorption dose, pH, and temperature were investigated, and interaction was characterized by Fourier transform infrared spectroscopy and field emission scanning electron microscope. The non-linear method of the Langmuir isotherm equation was found to be the best f
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25

Thiraviyam, P., K. Kannan, and P. Premkumar. "A Characteristic Investigation of Aminocyclohexane-N′-methylurea as a Corrosion Inhibitor for Mild Steel in 1 N H2SO4." Journal of Chemistry 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/370821.

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The newly synthesized aminocyclohexane-N′-methylurea Mannich base was characterised using FT-IR, H1NMR, and C13NMR spectra and also it was tested as corrosion inhibitor for the mild steel in 1 N sulphuric acid. Inhibitive study of this compound was carried out by weight loss method over the temperature range of 303–333 K, potentiodynamic polarisation, and AC impedance methods. The inhibition efficiency was increased with increasing concentration of inhibitor whereas it was decreased with increasing temperature. Potentiodynamic polarisation study showed that ACMU is a mixed type inhibitor. AC I
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Mardiah, Rif’an Fathoni, Pratiwi Pudyaningtyas, Hamdania Gamu, and Rinaldy. "Reuse of Newspaper As An Adsorbent For Cu (II) Removal By Citric Acid Modification." MATEC Web of Conferences 156 (2018): 02012. http://dx.doi.org/10.1051/matecconf/201815602012.

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High Consumption of paper, bring the impact of the waste paper itself. And the utilization of the paper is limited to recycled products and crafts, whereas paper such as newspaper still contains cellulose that can be potential to be used as a heavy metal adsorbent. In this study, newspaper was dissolved in sodium bicarbonate to reduce various impurities and then was reacted with citric acid (CA). The modified adsorbent was characterized by FTIR and was tested for adsorb Cu(II) in artificial solution. After adsorption process, the solution was filtered and analysed using Atomic Absorption Spect
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27

Rubinos, D., M. T. Barral, B. Ruiz, et al. "Phosphate and arsenate retention in sediments of the Anllóns river (northwest Spain)." Water Science and Technology 48, no. 10 (2003): 159–66. http://dx.doi.org/10.2166/wst.2003.0564.

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We have studied the distribution and sorption behavior of phosphate and arsenate in bed-sediments of the Anllóns river (NW Spain). As a consequence of the intense gold-mining activity in the past, substantial amounts of arsenic were found in the river sediments. For phosphorus, higher concentrations were found near two sources of P pollution. Sorption isotherms were described by the Freundlich, Langmuir and Tempkin equations. In general, the sediments sorbed more P than As. The equilibrium P concentration (EPC) reveals that sediments act as a scavenger for soluble P; by contrast, equilibrium A
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28

Muhammad, Amir, Anwar ul Haq Ali Shah, and Salma Bilal. "Effective Adsorption of Hexavalent Chromium and Divalent Nickel Ions from Water through Polyaniline, Iron Oxide, and Their Composites." Applied Sciences 10, no. 8 (2020): 2882. http://dx.doi.org/10.3390/app10082882.

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Water pollution caused by industrial wastes containing heavy metals and dyes is a major environmental problem. This study reports on the synthesis, characterization, and utilizations of Polyaniline (PANI) and its composites with Fe3O4 for the removal of hexavalent chromium Cr(VI) and divalent nickel Ni(II) ions from water. The adsorption data were fitted in Freudlich, Langmuir, Tempkin, Dubbanin–Ruddishkawich (D–R), and Elovich adsorption isotherms. The Freundlich isotherm fits more closely to the adsorption data with R2 values of 0.9472, 0.9890, and 0.9684 for adsorption of Cr(VI) on Fe3O4, P
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Mahmoodi, Niyaz Mohammad, Zahra Mokhtari-Shourijeh, and Asieh Ghane-Karade. "Synthesis of the modified nanofiber as a nanoadsorbent and its dye removal ability from water: isotherm, kinetic and thermodynamic." Water Science and Technology 75, no. 10 (2017): 2475–87. http://dx.doi.org/10.2166/wst.2017.022.

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In this paper, poly(vinyl alcohol) (PVA) nanofiber was prepared and modified by diethylenetriamine (DETA) and ethylenediamine (EDA) in the presence of glutaraldehyde (GA). Dye removal ability of the modified nanofiber (PVA/DETA/EDA/GA) as a nanoadsorbent from water was studied. Fourier transform Infrared (FTIR) and scanning electron microscopy (SEM) were used to investigate the characteristics of the modified nanofiber. Direct Red 23 (DR23) and Direct Blue (DB78) were used. The effect of operational parameters such as pH, initial dye concentration, contact time, temperature and adsorbent dosag
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Ikram, Muhammad, Afrasiab Ur Rehman, Sharafat Ali, Sher Ali, Syed Ul Hasnain Bakhtiar, and Sultan Alam. "The adsorptive potential of chicken egg shells for the removal of oxalic acid from wastewater." Journal of Biomedical Engineering and Informatics 2, no. 2 (2016): 118. http://dx.doi.org/10.5430/jbei.v2n2p118.

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Chicken egg shells were grinded and sieved to an exact particle size of 125 micron and treated with excess aqua regia and n-hexane to remove inorganic and organic impurities. Adsorption of oxalic acid from waste water was studied on treated powder egg shells by kinetics and batch adsorption techniques at different temperatures, 20ºC, 30ºC and 40ºC. The samples were characterized by BET surface area, scanning electron microscopy (SEM), and Fourier Transform Infra-red Spectroscopy (FTIR) and energy dispersive spectroscopy (EDS) techniques. The amount of acid adsorbed was determined with respect
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31

Tran, Quoc Toan, Tra Huong Do, Xuan Linh Ha, et al. "Study of the Ciprofloxacin Adsorption of Activated Carbon Prepared from Mangosteen Peel." Applied Sciences 12, no. 17 (2022): 8770. http://dx.doi.org/10.3390/app12178770.

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In this study, activated carbon derived from mangosteen peel (abbreviated as ACMP) was successfully fabricated. This as-prepared ACMP possessed graphite and had a porous structure with a specific surface area of 419.8554 m2/g. Investigations of the influencing factors on the ciprofloxacin (CIP) adsorption capability of the ACMP based on the static adsorption method showed that: adsorption equilibrium can be achieved in 60 min, the optimal pH for CIP adsorption was a pH of 6, and the optimal ratio between the material mass and solution volume was 3 g/L. The CIP adsorption process of the ACMP fo
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32

Zainal, Israa G. "Biosorption of Cr(VI) from AqueousSolution Using New Adsorbent: Equilibrium and Thermodynamic Study." E-Journal of Chemistry 7, s1 (2010): S488—S494. http://dx.doi.org/10.1155/2010/713197.

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Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from polluted water. In the present study cinnamon was utilized for Cr(VI) removal from aqueous solutions.It was found that a time of two hours was sufficient for sorption to attain equilibrium. The optimum pH was 2 for Cr(VI) removal. Temprature has little influence on the biosorption process. The Cr(VI) removal decreased with increase in temperature. The biosorption data was well fitted to Dubinin - Radushkevich (D-R), Freundlich and Tempkin adsorption isotherm models, alt
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33

Kaur, Rajvir, and Harpreet Kaur. "Adsorptive Removal of Amido Black 10B from Aqueous Solution using Stem Carbon of Ricinus communis as Adsorbent." Asian Journal of Chemistry 31, no. 5 (2019): 1071–76. http://dx.doi.org/10.14233/ajchem.2019.21813.

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Abstract (sommario):
In the present work the efficiency of activated carbon made from stems of Ricinus communis (CRC) has been studied for removal of anionic dye- Amido black 10B from aqueous solution. The adsorbent has been characterized with scanning electron microscopy (SEM) and Fourier transformer infrared (FT-IR). The effects of various experimental parameters such as contact time, adsorbent dose, initial dye concentrations, pH, concentration of salt and temperature have been studied. Langmuir, Freundlich and Tempkin isotherm models have been used for describing the adsorption process. Of these, Langmuir isot
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34

Dinh, Van Phuc, Ngoc Chung Le, Thi Phuong Tu Nguyen, Thi Dong Thuong Hoang, Van Dong Nguyen, and Ngoc Tuan Nguyen. "Zinc Adsorption Property of Gamma-MnO2 Nanostructure: Equilibrium and Kinetic Studies." Key Engineering Materials 708 (September 2016): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.708.3.

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In this work, gamma–MnO2 nanostructure was used as a sorbent to remove Zn (II) ion from aqueous solution. The influence of pH, sorption time and Zn (II) ion initial concentration were examined. The results showed that equilibrium adsorption was obtained after 60 minutes with 240 rpm of shaking speed at pH = 4.0. The experimental data were analyzed using five non-linear isotherm models: Langmuir, Freundlich, Sips, Tempkin and Dubinin – Radushkevich. The adsorption capacity (qm) from the Langmuir isotherm model for Zn (II) is founded as 55.23 mg/g. The heat of sorption process and the mean free
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35

Bartczak, Przemysław, Monika Wawrzkiewicz, Sławomir Borysiak, and Teofil Jesionowski. "Cladium mariscus Saw-Sedge versus Sawdust—Efficient Biosorbents for Removal of Hazardous Textile Dye C.I. Basic Blue 3 from Aqueous Solutions." Processes 10, no. 3 (2022): 586. http://dx.doi.org/10.3390/pr10030586.

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Abstract (sommario):
Bio-based waste materials are more often used as effective and cheap adsorbents to remove toxic organic compounds such dyes. Batch adsorption of C.I. Basic Blue 3 (BB3) onto Cladium mariscus saw-sedge was studied in comparison with sawdust obtained from various species of wood in order to explore their potential application as low-cost sorbents for basic dye removal from wastewaters. The effect of phase contact time (1–240 min), initial dye concentration (50–200 mg/L), and the auxiliaries presence (10–60 g/L NaCl and 0.1–0.75 g/L anionic surfactant) on BB3 uptake was investigated. The adsorpti
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36

Bach, Long Giang, Dai Viet Nguyen Vo, Nguyen Duy Trinh, Van Thi Thanh Ho, and Van Thuan Tran. "Removal of Cu2+ from Aqueous Water by Adsorption onto the Efficient and Recyclable Durian Shell-Derived Activated Carbon." Applied Mechanics and Materials 876 (February 2018): 46–51. http://dx.doi.org/10.4028/www.scientific.net/amm.876.46.

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Abstract (sommario):
We investigated the use of durian shell-derived activated carbon (DSAC) for the removal of Cu2+. To determine the optimal condition for Cu2+ removal, the response surface methodology (RSM) was used to establish a second-order polynomial model with variables such as Cu2+ concentration (Ci), adsorbent dosage (dDSAC) and pH. With R2 = 0.9847 and P-value < 0.0001, the model was proved to be statistically significant. The RSM based confirmation test revealed that the removal of Cu2+ was maximum (99.6%) at optimal conditions: Ci = 61.6 mg/L, dDSAC = 5.0 g/L and pH = 5.2. Based on calculated R2, d
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37

Alsehli, Bandar R. M. "A Simple Approach for Determining the Maximum Sorption Capacity of Chlorpropham from Aqueous Solution onto Granular Activated Charcoal." Processes 8, no. 4 (2020): 398. http://dx.doi.org/10.3390/pr8040398.

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Abstract (sommario):
UV-Vis spectrophotometer was used to determine chlorpropham (CIPC) concentration in aqueous solution. The method was validated in term of linearity, precision and limit of detection and limit of quantitation. The correlation coefficient of standards calibration curve of (1.0–10.0 µg/mL CIPC) was R2 = 1 with a precision (RSD%, n=10) ranged from (0.87–0.53%). The limit of detection (LOD) and limit of quantitation (LOQ) based on the regression statistics of the calibration curve data of (1.0–10.0 µg/mL CIPC) were 0.04 µg/mL and 0.11 µg/mL respectively. The activated carbon adsorbent was found to
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38

Luo, Lu, Xi Wu, Zeliang Li, et al. "Synthesis of activated carbon from biowaste of fir bark for methylene blue removal." Royal Society Open Science 6, no. 9 (2019): 190523. http://dx.doi.org/10.1098/rsos.190523.

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Abstract (sommario):
Activated carbon (AC) was successfully prepared from low-cost forestry fir bark (FB) waste using KOH activation method. Morphology and texture properties of ACFB were studied by scanning and high-resolution transmission electron microscopies (SEM and HRTEM), respectively. The resulting fir bark-based activated carbon (ACFB) demonstrated high surface area (1552 m 2 g −1 ) and pore volume (0.84 cm 3 g −1 ), both of which reflect excellent potential adsorption properties of ACFB towards methylene blue (MB). The effect of various factors, such as pH, initial concentration, adsorbent content as wel
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39

Kusuma Jayasree Komali, Kaza, Lingam Anjali, Balam Krishna Sri Pragnya, Satti Amrutha, and Meena V. "Synthesis, Characterization and Sustainability by Utilisation of Psidium Guajava-Iron Nano particles (PG-FeNPs) for the removal of Methylene blue Dye." E3S Web of Conferences 552 (2024): 01065. http://dx.doi.org/10.1051/e3sconf/202455201065.

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Abstract (sommario):
Water is the only liquid that sustains all life and acts as catalyst to initiate their metabolisms. It is more essential to life than all other nutrients put together. Life becomes impossible without water. In the past few years, one of the most important environmental crisis has been the contamination of water resources. Using Psidium guajava leaves ass adsorbents, the current work aims to extract methylene blue from an aqueous solution. The variables that were examined includes temperature, average particle size of adsorbents, initial dye concentration, contact time, solution pH, adsorbent d
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40

Alharbi, Abdulrahman F., Abdullah A. Alotaibi, Hassan E. M. Gomaa, Abdulaziz A. M. Abahussain, and Sami M. Abdel Azeem. "Magnetic Biochar by One-Step Impregnation Pyrolysis of Peganum harmala L. for Removal of Rhodamine B." Adsorption Science & Technology 2023 (August 16, 2023): 1–17. http://dx.doi.org/10.1155/2023/9993465.

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Abstract (sommario):
A new magnetic P. harmala biochar/Mn-ZnFe2O4 material was prepared by the one-step pyrolysis approach and characterized by FT-IR, SEM, XRD, and BET techniques. The efficacy of removing rhodamine B (RhB) via adsorption and catalytic degradation was examined. Adsorption removal attained 82% of 10 mg·L-1 RhB at pH 4.0, 90 min of agitation, and 3.2 g·L-1 of adsorbent. The adsorption kinetics indicated a diffusion-limited mechanism and matched the second-order model. The equilibrium data are better suited by the Langmuir isotherm, and the maximum monolayer adsorption capacity ( q max ) was 34.5 mg·
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41

Kachhwaha, Vandana, Pooja Kumari, Naresh Giri, and Pallavi Mishra. "Evaluation of Lead Removal by Activated Citrus Sinensis Biochar Impregnated with Calcium Alginate Beads." Oriental Journal Of Chemistry 39, no. 6 (2023): 1547–55. http://dx.doi.org/10.13005/ojc/390615.

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Abstract (sommario):
This study introduces an innovative method of using activated carbon derived from orange peels incorporated into calcium alginate beads to remove lead from synthetic water efficiently. This novel approach demonstrates remarkable effectiveness in addressing lead pollution in water. Established techniques such as SEM and FTIR were employed to characterize the adsorbents created in the laboratories. Batch studies confirmed the lead adsorbed were conducted to evaluate the efficiency of lead removal, with the highest removal efficiencies achieved at pH 6.5 (90.3%), an adsorbent dose of 2 mg (90.3%)
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42

Abdullah, Salah M., Aseel F. Alwan, Atheer M. Majeed, and Enageh T. A. Abdalgader. "Linear and Non-linear Regression Methods to Study the Adsorption of Cr(VI) from an Aqueous Solution Using Pomegranate Peel." Al-Mustansiriyah Journal of Science 34, no. 4 (2023): 58–65. http://dx.doi.org/10.23851/mjs.v34i4.1340.

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Abstract (sommario):
In this study, the previous data of the adsorption of Chromium (VI) ions on the pomegranate peels (MPGP) as adsorbents were used. linear and non-linear equations for Langmuir, Freundlich, Dubinin-Radushkevich, Tempkin, Redlich-Peterson, Sips, and Toth adsorption isotherm models were applied. The five error functions ERRSQ, HYBRD, MPSD, ARE, and EABS were analyzed for non-linear isotherm equations and in each case a set of isotherm parameters were determined. The algorithms for the simulation of linear and non-linear isotherm models using error functions were achieved with the aid of Microsoft
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43

Davoud, Balarak, Kord Mostafapour Ferdos, and Joghtaei Ali. "Thermodynamic Analysis for Adsorption of Amoxicillin onto Magnetic Carbon Nanotubes." British Journal of Pharmaceutical Research 16, no. 6 (2017): 1–11. https://doi.org/10.9734/BJPR/2017/33212.

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Abstract (sommario):
The effect of temperature on the equilibrium adsorption of Amoxicillin (AMO) from aqueous solution using modified magnetic multi-walled carbon nanotubes (MMWCNT<sub>S</sub>) was investigated. The equilibrium adsorption data were analyzed using three widely applied isotherms: Langmuir, Freundlich and Tempkin. The results revealed that Langmuir isotherm fit the experimental results well. Kinetic analyses were conducted using pseudo-first and second-order models and the intraparticle diffusion model. The regression results showed that the adsorption kinetics were more accurately represented by ps
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44

Muhmed, Siti Aishah, and Mohd Ghazali Mohd Nawawi. "Biopolymeric Adsorbent for the Removal of Methylene Blue: Characterizations, Equilibrium Isotherms and Kinetic Studies." Advanced Materials Research 1125 (October 2015): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.1125.281.

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Abstract (sommario):
Crosslinked Sago Starch (CSS) was prepared by crosslinking native starch with Sodium Trimetaphosphate. As a biodegradable adsorbent, CSS was used to remove methylene blue (MB) from the aqueous solution based on its characterization, including the granule morphology, crystalline nature and molecular structure. The adsorption capacity of CSS was evaluated as a function of pH, adsorbent dosage, initial concentration and time. It was favorable for adsorption under condition of neutral and at high initial concentration. The adsorption capacity trend was decreased with increasing the adsorbent dosag
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45

Do, Tra Huong, Van Tu Nguyen, Quoc Dung Nguyen, Manh Nhuong Chu, Thi Cam Quyen Ngo, and Lam Van Tan. "Equilibrium, Kinetic and Thermodynamic Studies for Sorption of Phosphate from Aqueous Solutions Using ZnO Nanoparticles." Processes 8, no. 11 (2020): 1397. http://dx.doi.org/10.3390/pr8111397.

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Abstract (sommario):
In this study, ZnO nanoparticles were fabricated by using the hydrothermal method for adsorption of phosphate from wastewater. The obtained ZnO nanorods were characterized by powder X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), specific surface area (BET) and energy dispersive X-ray spectroscopy (EDS). The ZnO materials were applied for adsorption of phosphate from water using batch experiments. The effects of pH (4–10), adsorption time (30–240 min), the amount of adsorbent (0.1–0.7 g/L) and initial concentration of phosphate (147.637–466.209 mg/L) on the adsorption
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46

Alharbi, Walaa, Khadija Alharbi, Abdullah Alotaibi, and Sami Abdel Azeem. "Catalytic Degradation Performance of Manganese-Zinc Ferrite Nanoparticles Coated With Eggshell-Derived Calcium Oxide For Rhodamine B Removal." Chiang Mai Journal of Science 52, no. 1 (2025): 1–24. https://doi.org/10.12982/cmjs.2025.006.

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Abstract (sommario):
Low-cost natural materials-mediated adsorbents for the removal of dye pollutants from water are gaining popularity over chemical adsorbents due to their eco-friendliness, widespread availability, and ease of manufacture. A CaO-derived from eggshell was used to alter the surface of zinc-manganese-ferrite (Zn0.6Mn0.4Fe2O4) nanoparticles by the post-precipitation method. The CaO/Zn0.6Mn0.4Fe2O4 nanocomposite was studied using FT-IR , XRD and SEM, and utilized for the removal of Rhodamine B dye. The adsorption efficiency of 10 mg L-1 RhB reached 75% at pH 4.0, 60 min of shaking, and 2.0 g L-1 of a
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47

Laib, Radouane, Samira Amokrane-Nibou, Djamel Nibou, and Mohamed Trari. "Recovery of recycled paper in the removal of the textile dye basic yellow 28: characterization and adsorption studies." Nordic Pulp & Paper Research Journal 34, no. 2 (2019): 218–27. http://dx.doi.org/10.1515/npprj-2018-0071.

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Abstract (sommario):
Abstract A recycled newspaper pulp (NPP) was used in the adsorption of a basic textile dye (Sandocryl gold yellow, basic yellow 28: BY28). NPP was deinked and bleached for the homogeneity of the adsorbent and elimination of the anchor. The release of NPP was followed by measuring the absorbance and chemical oxygen demand (COD) in water. The NPP samples were characterized by X-ray diffraction and FT-IR spectroscopy while the morphology was visualized by the SEM technique and the chemical composition determined by the energy dispersive spectroscopy (EDS). The adsorption of BY28 on NPP was invest
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48

Sharma, Arush, Gaurav Sharma, Amit Kumar, Zia Mahmood Siddiqi, and Gaurav Sharma. "Exclusion of Organic Dye Using Neoteric Activated Carbon Prepared from Cornulaca monacantha Stem: Equilibrium and Thermodynamics Studies." Materials Science Forum 875 (October 2016): 1–15. http://dx.doi.org/10.4028/www.scientific.net/msf.875.1.

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Abstract (sommario):
In this study, Cornulacamonacantha stem (CMS) has been used for the preparation of highly competent, ecofriendly and low-cost activated carbon (CMSAC) biosorbent. It was characterized by some instrumental techniques such as Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The biosorbent was evaluated for the eradication of hazardous malachite green (MG) dye from aqueous solution. Batch experiments were conducted to assess the effect of various adsorption parameters such initial dye concentration, sorbent dosage, pH, agitation time and temperature. The resu
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49

Suteu, Daniela, Carmen Zaharia, and Teodor Malutan. "Removal of orange 16 reactive dye from aqueous solutions by waste sunflower seed shells." Journal of the Serbian Chemical Society 76, no. 4 (2011): 607–24. http://dx.doi.org/10.2298/jsc100721051s.

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Abstract (sommario):
In this work, the use of an agro-industrial waste, i.e., sunflower seed shells, was investigated as a sorbent for the removal of Orange 16 reactive dye from aqueous environments. Batch experiments were performed as a function of pH, sorbent dose, dye concentration, temperature and contact time. The percent dye removal increased with increasing sorbent dose and temperature of the aqueous solution, and decreased with increasing dye concentration; the required contact time was five hours. The Freundlich, Langmuir, Dubinin-Radushkevich and Tempkin adsorption isotherms were used to describe the equ
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50

Shah, Bhavna, Ajay Shah, and Piyush Jadav. "Extractive efficacy of microwave synthesized zeolitic material for acephate: Equilibrium and kinetics." Journal of the Serbian Chemical Society 78, no. 7 (2013): 1055–77. http://dx.doi.org/10.2298/jsc120530146s.

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Abstract (sommario):
Present investigation deals with the utilization of Bagasse fly ash (BFA) a sugar industry waste and Zeolitic material (MZBFA), synthesized from BFA by combined conventional and microwave reflux method as adsorbents for the extraction of Acephate (ACP), an organophosphorus pesticide from aqueous solution. The synthesized adsorbents were characterized using various techniques such as FTIR, PXRD and SEM. The effect of various experimental parameters has been investigated using a batch adsorption technique for the extraction of ACP. The extent of removal is increased with decrease in initial ACP
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