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Journal articles on the topic 'Zinc – Absorption and adsorption'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Zhang, Dong, and Yan Li Zhang. "Study on the Adsorption Capability of Nano-Barium-Strontium Titanate Immobilized on Aluminum Oxide for Zinc Ion." Advanced Materials Research 279 (July 2011): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.279.147.

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Zinc ion was adsorbed and enriched by nano-barium-strontium titanate immobilized on aluminum oxide(ABST). The adsorption and elution conditions were investigated. The results showed that ABST had strong adsorption ability for zinc ion in water in the medium at pH more than 4.0. The maximum adsorption capability was up to 16.38 mg/g. The adsorbed zinc on ABST could be eluted and reclaimed with 0.5 mol/L of HNO3. Zinc was determined by flame atomic absorption spectrophotometry (FAAS). The detection limit of this method for zinc ion was 2.5 μg/L. The method had been applied to the determination o

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2

Bahrizal and Rahadian Z. "STUDI SERAPAN ION SENG(II) OLEH BIOMASSA MIKROALGA (Tetraselmis chuii)." Jurnal Riset Kimia 2, no. 2 (2015): 107. http://dx.doi.org/10.25077/jrk.v2i2.146.

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ABSTRACT In the present work, the process of zinc-ion adsorption by T. chuii biomass have been investigated. This investigation intend to determinate capacity of adsorption the biomass for zinc-ion in water. A weight of 100 mg biomass was put into 6 ppm of the metal-ion solution whose pH varied from 5.0 to 7.0. Then, these solutions were stirred for 30 minutes. After filtering, the metal-ion concentration in the filtrate was determined by atomic absorption spectrometry. The amount of ion adsorbed by the biomass was taken as the difference between the initial and final concentration of the solu

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3

Mendes, Elton, Elidio Angioletto, Erlon Mendes, et al. "Kinetics Modelling of the Adsorption Process of Zinc Ions by Glass Microparticles." Materials Science Forum 930 (September 2018): 556–61. http://dx.doi.org/10.4028/www.scientific.net/msf.930.556.

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The oligodynamic property is a lethal effect which some atoms exert over bacteria, fungi and other microorganisms. The oligodynamic property can be promoted by glass microparticles doped by zinc ionic specimens utilizing the ionic exchange processes. This study is aimed at modelling the behavior of adsorption mechanisms of the zinc ions on glass microparticles absorbent, with potential use as antimicrobial material. Aqueous solutions of zinc nitrate were used as the ionic supplying of zinc ions. The amount of zinc adsorbed on the glass was determined by spectroscopy of atomic absorption and wi

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4

Lee, Shu Chin, Hendrik O. Lintang, and Yuliati Leny. "Synthesis and Characterization of Zinc Phthalocyanine/Mesoporous Carbon Nitride Nanocomposites." Advanced Materials Research 364 (October 2011): 363–67. http://dx.doi.org/10.4028/www.scientific.net/amr.364.363.

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In this work, zinc phthalocyanine (ZnPc) was impregnated onto mesoporous carbon nitride (m-C3N4) to expand its absorption to longer wavelength. Nitrogen adsorption-desorption isotherm confirmed that the m-C3N4 showed type IV of adsorption-desorption isotherm. Transmission electron microscopy (TEM) revealed the presence of both nanosphere and nanoworm structure in the m-C3N4. Thermogravimetric analysis (TGA) showed that the synthesized m-C3N4 was thermally stable until 723 K. The presence of ZnPc on the m-C3N4 was confirmed from the X-ray diffraction (XRD) patterns and diffuse reflectance ultra

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5

Petrushka, Ihor, Oksana Bratus, and Kateryna Petrushka. "Features of adsorption processes for wastewater treatment from zinc ions." Environmental Problems 6, no. 2 (2021): 64–68. http://dx.doi.org/10.23939/ep2021.02.064.

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The results of adsorption properties of complex natural sorbents in relation to the neutralization of zinc ions from wastewater are presented. The adsorption isotherm of Zn2+ ions on complex sorbents (clinoptilolite-shungite) (1:1) according to Langmuir and Freundlich models is constructed, the type of adsorption isotherms according to S. Brunauer classification is established. The value of the maximum sorption capacity of Gmax complex sorbents for Zn2+ ions is calculated. The peculiarities of the sorption process of zinc ions with the formation of a monomolecular layer based on the calculated

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6

Journal, Baghdad Science. "The Removal of Zinc from Aqueous Solutions Using Malvaparviflora." Baghdad Science Journal 13, no. 3 (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,wh

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7

Pilbáth, A., É. Pfeifer, F. H. Kármán, Ilona Felhősi, J. Mink, and Erika Kálmán. "Environmentally Acceptable Pre-Treatment of Zinc with Alkyl Diphosphonates for Corrosion Protection." Materials Science Forum 589 (June 2008): 37–42. http://dx.doi.org/10.4028/www.scientific.net/msf.589.37.

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The objective of our studies was to investigate the layer formation of 1, 5-diphosphonopentane (DPP) on zinc surface from aqueous solution. For surface treatment, water based solutions of 1, 5-diphosphono-pentane was applied with different treatment times. Evidence of the adsorption of the diphosphonic acid on the zinc surface was obtained using the Infrared Reflection Absorption Spectroscopy (IRRAS).

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8

Bairwa, Rajendra, Mamta ., Nintu Mandal, Nilanjan Chattopadhyaya, and Neeraj Bagoria. "Adsorption and Desorption of zinc in soil and its implication." International Journal of Agricultural Invention 3, no. 02 (2018): 191–202. http://dx.doi.org/10.46492/ijai/2018.3.2.17.

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Zn availability mostly regulated through adsorption-desorption on soil (or adsorbent). Fly ash (FA) application influence on zinc adsorption-desorption in recommended chemical fertilizer (RDF) and farmyard manure (FYM) treatments of acidic Inceptisols of Assam. Zinc adsorption was better explained by Freundlich over the Langmuir adsorption equation. Adsorption was greatest in the treatment receiving FA only at 15 t ha−1 and least in the treatment receiving RDF 50 percent + FYM 5 t ha−1 + FA 5 t ha−1. Ni and Zn co-sorption to aluminium oxides (γ-Al2O3) in binary-sorbate systems were compared to

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9

Rogova, O., and Yu Vodyanitsky. "ZINC AND COPPER SORPTION IN THE AFFECTED SOILS OF THE CHEREPOVETS METALLURGICAL COMPLEX." Dokuchaev Soil Bulletin, no. 65 (June 30, 2010): 65–74. http://dx.doi.org/10.19047/0136-1694-2010-65-65-74.

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The laws of zinc and copper absorption by agrarian and carbonate soils in the area of Cherepovets Steel Mill are described. Sorption isotherms demonstrate high affinity of PPK of the studied soils to zinc and copper. Approximation of experimentally obtained isotherms by three methods: Freindlich, Lengmyur, Dabinin-Radushkevich. It is shown that Langmur's model cannot to be applied to most isotherms. The Dibininin model -Raduskevich well approximates the obtained data and enables thermodynamic characteristics of the adsorption process. According to the obtained indicators, the most significant

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10

Shabany, M., Ali Mohammad Haji Shabani, Shayessteh Dadfarnia, Alireza Gorji, and S. H. Ahmadi. "Solid phase extraction of zinc with octadecyl silica membrane disks modified by N,N’-disalicylidene-1,2-phenylendiamine and determination by flame atomic absorption spectrometry." Eclética Química Journal 33, no. 2 (2018): 61. http://dx.doi.org/10.26850/1678-4618eqj.v33.2.2008.p61-66.

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A procedure for separation and preconcentration of trace amounts of Zn(II) from aqueous media is proposed. The procedure is based on the adsorption of Zn2+ on octadecyl bonded silica membrane disk modified with N,N’-disalicylidene-1,2-phenylendiamine at pH 7. The retained zinc ions were then stripped from the disk with a minimal amount of 1.5 mol L-1 hydrochloric acid solution as eluent, and determined by flame atomic absorption spectrometry. Maximum capacity of the membrane disk modified with 5 mg of the ligand was found to be 226 μg Zn2+. The relative standard deviation of zinc for ten repli

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11

Ayad, Nadia Mohammed Elmassalami, Daniel Navarro da Rocha, Andrea Machado Costa, and Marcelo Henrique Prado da Silva. "Chlorhexidine Adsorption in Hydroxyapatite and Alginate Microspheres by Extrusion in Zinc and Calcium Chloride." Key Engineering Materials 720 (November 2016): 25–30. http://dx.doi.org/10.4028/www.scientific.net/kem.720.25.

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In this work, the adsorption of a low-concentration solution of chlorhexidine (CHX), an antimicrobial drug, in hydroxyapatite (HA) and alginate microspheres was studied. The microspheres were formed by extrusion of a 1:10 mixture of alginate and HA in two different divalent solutions: CaCl2 and ZnCl2. UV-Vis spectroscopy showed that the microspheres adsorbed approximately half of the chlorhexidine in solution, which was initially at 0.2%. XRD patterns obtained prior adsorption confirmed the presence of HA as the only crystalline phase. Scanning electron microscopy (SEM) with energy dispersive

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12

Hajialigol, Saeed, Mohammad Ali Taher, and Akbar Malekpour. "Determination of Trace Amounts of Zinc by Flame Atomic Absorption Spectrometry After Preconcentration with Modified Clinoptilolite Zeolite." Journal of AOAC INTERNATIONAL 91, no. 6 (2008): 1446–52. http://dx.doi.org/10.1093/jaoac/91.6.1446.

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Abstract Natural clinoptilolite was used as a sorbent material for solid-phase extraction and preconcentration of zinc. Clinoptilolite was first saturated with cadmium (II) and then modified with benzyldimethyltetradecylammonium chloride for increasing adsorption of 3-(2-arsenophenylazo)-4,5-dihydroxy-2,7-naphthalene disulfonic acid (neothorin). Zinc was quantitatively retained on the adsorbent by the column method in the pH range of 3.84.2 at a flow rate of 1 mL/min. It was eluted from the column with 5.0 mL 2 M nitric acid solution at a flow rate of 1 mL/min and determined by flame atomic ab

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13

Albiss, Borhan, and Muna Abu-Dalo. "Photocatalytic Degradation of Methylene Blue Using Zinc Oxide Nanorods Grown on Activated Carbon Fibers." Sustainability 13, no. 9 (2021): 4729. http://dx.doi.org/10.3390/su13094729.

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In this work, the synthesis, characterization, and photocatalytic performance of zinc oxide/activated carbon fiber nanocomposites prepared by hydrothermal method were investigated. Zinc oxide nanoparticles (ZnO-NP) were deposited as seeds on porous activated carbon fiber (ACF) substrates. Then, zinc oxide nanorods (ZnO-NR) were successfully grown on the seeds and assembled on the fibers’ surface in various patterns to form ZnO-NR/ACF nanocomposites. The nanocomposites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectromet

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14

Nang An, Vu, Tran T. T. Van, Ha T. C. Nhan, and Le Van Hieu. "Investigating Methylene Blue Adsorption and Photocatalytic Activity of ZnO/CNC Nanohybrids." Journal of Nanomaterials 2020 (March 17, 2020): 1–10. http://dx.doi.org/10.1155/2020/6185976.

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Nanohybrids of zinc oxide/cellulose nanocrystals (ZnO/CNCs) were successfully prepared by using a low cost and green method for adsorption and photocatalytic degradation of methylene blue (MB). CNCs have been derived through the hydrolysis reaction by citric/hydrochloric acid from the pure cellulose isolated from Vietnamese Nypa fruticans trunk. The influence of the Zn2+ ion concentration on the morphology, microstructure, and thermal properties as well as the photocatalytic activity of the ZnO/CNC nanohybrids was investigated in detail. Analyses of FTIR spectra, XRD, and SEM indicated that th

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15

Lu, Min, Xu Zhang, and Nuo Chen. "The Application of Self-Assembled of Meso-2,3-Dimercaptosuccinic Acid-Polydopamine-Zinc Oxide for Trace Cadmium Analysis." Applied Sciences 10, no. 7 (2020): 2462. http://dx.doi.org/10.3390/app10072462.

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Nanomaterials have been applied in the analysis of trace contaminants in aquatic samples; however, the adsorption affinity of heavy metal ions to metallic oxide nanoparticles is low. Meso-2,3-dimercaptosuccinic acid-polydopamine-zinc oxide (DMSA/PDA/ZnO) was synthesized through a facile self-assembly process for enhancing the adsorption capacity of ZnO to cadmium cation (Cd(II)). A method for the analysis of trace Cd(II) in water samples was developed while using dimercaptosuccinic acid/Polydopamine/zinc oxide (DMSA/PDA/ZnO) as an adsorbent and atomic absorption spectrometry (AAS) as a means o

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16

Victor M., Stevano, Bayu Andhika, and Isna Syauqiah. "PEMANFAATAN KITOSAN DARI LIMBAH CANGKANG BEKICOT (Achatina fulica) SEBAGAI ADSORBEN LOGAM BERAT SENG (Zn)." Konversi 5, no. 1 (2018): 22. http://dx.doi.org/10.20527/k.v5i1.4775.

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Abstrak- Telah dilakukan pemanfaatan cangkang bekicot (Achatina fulica) sebagai adsorben logam berat seng (Zn). Penelitian ini bertujuan untuk mengetahui jumlah kitosan yang didapat dari cangkang bekicot, dan mengetahui kemampuan adsorben kitosan dalam uji adsorpsi yang menggunakan sampel air yang tercemar seng (Zn). Pembuatan kitosan dari cangkang bekicot dilakukan dengan dua tahap yaitu tahap pembuatan kitosan dengan variasi ukuran kitosan 250 micron dan 355 micron. Tahap pembuatan kitosan terdiri dari pembuatan serbuk cangkang bekicot, deproteinasi, demineralisasi, depigmentasi dan deasetil

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17

Nourbakhsh, Shirin, Majid Montazer, and Zoha khandaghabadi. "Zinc oxide nano particles coating on polyester fabric functionalized through alkali treatment." Journal of Industrial Textiles 47, no. 6 (2016): 1006–23. http://dx.doi.org/10.1177/1528083716657819.

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In recent years, zinc oxide nano particles coating on textiles such as polyester is considered because of UV blocking and self-cleaning properties. Alkaline hydrolysis of polyester is a method in textile industry for surface treatment in large scale to enhance wettability. In the present work, polyester fabric was treated with sodium hydroxide, then was coated with ZnO nano particles, and also polyester fabric was treated with sodium hydroxide and ZnO nano particles at the same time. The bending length, water adsorption time, bactericidal properties, atomic absorption spectroscopy, and self-cl

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18

Noer Hidayat, Djama’an, Maming Maming, and Syarifuddin Liong. "Utilization of Chicken Feather Biomass As Metal Zinc Adsorbent (Zn2+)." Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) 10, no. 2 (2019): 11. http://dx.doi.org/10.20956/ica.v10i2.6651.

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Chicken feather is a waste that can be used as an alternative to adsorbents that can be used to overcome environmental pollution in waters containing heavy metal pollutants, especially on metal Zn (II) ions, Biomass Chicken Feathers using NaOH and Na2SO3 as adsorbent activation and proven using FTIR spectrophotometer . The metal adsorbent of Zn (II) ion by chicken feather biomass has been influenced to the variation of pH of the solution, mass of adsorbent, contact time, and concentration of chicken feather biomass. The method used is the method of "batch" and the metal concentration of Zn (II

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19

Zhang, Dong, and Yan Li Zhang. "Solid-Phase Extraction Method for Preconcentration/Separation of Zinc Ion in Tap Water and Human Urine Using Organo-Bentonite Modified by Dithizone." Advanced Materials Research 230-232 (May 2011): 892–95. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.892.

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A new method was proposed for the preconcentration/separation of zinc at trace levels using a modified organo-bentonite with dithizone (D-O-bentonite) and determined by flame atomic absorption spectrometry (FAAS). The influences of some experimental parameters including pH of the sample solution, contact time, and volume of eluent have been investigated. The influences of some matrix elements were also examined. The results show that the zinc ion could be adsorbed on the D-O-bentonite. The adsorbed quantitively was affected by the pH value of medium and contact time. In the medium of pH 4-5, t

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20

Liu, Huang, Yanhua Zhang, Hongtao Yang, Wei Xiao, and Lanlan Sun. "Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange." Journal of Chemistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2862567.

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Nanometer-sized zinc oxide (ZnO) has been synthesized through sol-gel method with natural cellulose substance (commercial filter paper) as template. The structure of zinc oxide nanomaterial was characterized by nitrogen adsorption-desorption and XRD. The morphology was observed by SEM and TEM. The results show that the hexagonal wurtzite phase is actually the only crystal phase in the sample and the product faithfully inherits the hierarchical morphology and the complex network structure of the original filter paper, which is composed of many randomly intersecting zinc oxide microfibers and na

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21

Wang, Ya Li, Su Ping Cui, Xi Kui Xu, and Ming Zhang Lan. "Impact of pH Value and Temperature on Cement-Based Materials Adsorbing Heavy Metal Ions." Materials Science Forum 847 (March 2016): 265–71. http://dx.doi.org/10.4028/www.scientific.net/msf.847.265.

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The development of the city traffic and its increasing traffic flux are the signs of the development of the society, but causing a serious pollution on the city's ecological environment. Cement hydration reactions are needed to generate Ca (OH)2, C-S-H gel, and AFt, as well as other hydrated products. Meanwhile, heavy metal ions are contained and fixed in a cement paste under physical encapsulation, absorption, isomorphous replacement, and double decomposition. This paper mainly discusses the impact of hydration environment on the adsorption law of materials adsorbing heavy metal ions and the

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22

Soubane, D., A. Tirbiyine, M. Bellioua, S. Laasri, and A. Hajjaji. "Optical Features of Catalyst-free Zinc Oxide Nanostructures Confined to one Dimension -=SUP=-*-=/SUP=-." Журнал технической физики 127, no. 9 (2019): 468. http://dx.doi.org/10.21883/os.2019.09.48204.35-19.

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AbstractWe successfully fabricated polycrystalline zinc oxide catalyst-free nanorods by a successive ion layer adsorption and reaction process. We measured their optical transmittance, reflectance and thickness in addition to performing X-ray diffraction and probing film microscopic topology. We extracted different optical constants such as absorption coefficient, band gap, complex refractive index and complex dielectric function and inferred the behavior of the optical conductivity and show the supremacy of the obtained ZnO nanostructure over a bulk material. It turns out that it is possible

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23

Jafarian, V., and F. Ghaffari. "A unique metallothionein-engineered in Escherichia coli for biosorption of lead, zinc, and cadmium; absorption or adsorption?" Microbiology 86, no. 1 (2017): 73–81. http://dx.doi.org/10.1134/s0026261717010064.

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24

Baruah, Sunandan, Mohammad Abbas Mahmood, Myo Tay Zar Myint, Tanujjal Bora, and Joydeep Dutta. "Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods." Beilstein Journal of Nanotechnology 1 (November 22, 2010): 14–20. http://dx.doi.org/10.3762/bjnano.1.3.

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Hydrothermally grown ZnO nanorods have inherent crystalline defects primarily due to oxygen vacancies that enhance optical absorption in the visible spectrum, opening up possibilities for visible light photocatalysis. Comparison of photocatalytic activity of ZnO nanorods and nanoparticle films on a test contaminant methylene blue with visible light irradiation at 72 kilolux (klx) showed that ZnO nanorods are 12–24% more active than ZnO nanoparticulate films. This can be directly attributed to the increased effective surface area for adsorption of target contaminant molecules. Defects, in the f

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25

Zargar, R. A., M. Arora, S. Chackrabarti, S. Ahmad, J. Kumar, and A. K. Hafiz. "Alcohol vapor sensing by cadmium-doped zinc oxide thick films based chemical sensor." Modern Physics Letters B 30, no. 12 (2016): 1650244. http://dx.doi.org/10.1142/s0217984916502444.

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Cadmium-doped zinc oxide nanoparticles were derived by simple chemical co-precipitation route using zinc acetate dihydrate and cadmium acetate dihydrate as precursor materials. The thick films were casted from chemical co-precipitation route prepared nanoparticles by economic facile screen printing method. The structural, morphological, optical and electrical properties of the film were characterized relevant to alcohol vapor sensing application by powder XRD, SEM, UV-VIS and DC conductivity techniques. The response and sensitivity of alcohol (ethanol) vapor sensor are obtained from the recove

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Yu, Wu, Zhao, Zhu, and Luo. "Effect of a Small Amount of Iron Impurity in Sphalerite on Xanthate Adsorption and Flotation Behavior." Minerals 9, no. 11 (2019): 687. http://dx.doi.org/10.3390/min9110687.

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Through industrial testing at the Huize lead-zinc mine, it was found that the floatability of sphalerite varied greatly with the iron impurity content. Three kinds of Huize sphalerites with iron contents of 2.30 wt.%, 3.20 wt.% and 4.66 wt.%, were used to study the influence of small amounts of iron impurity in the sphalerite on xanthate adsorption and flotation behavior. The flotation experiments showed that the flotation recovery increased with the increase in iron impurity content. Fourier Transform infrared spectroscopy (FTIR) and Ultraviolet–visible (UV-VIS) spectra showed that the adsorb

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27

Nelson, Joey. "XANES reflects coordination change and underlying surface disorder of zinc adsorbed to silica." Journal of Synchrotron Radiation 28, no. 4 (2021): 1119–26. http://dx.doi.org/10.1107/s1600577521004033.

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Zinc K-edge X-ray absorption near-edge structure (XANES) spectroscopy of Zn adsorbed to silica and Zn-bearing minerals, salts and solutions was conducted to explore how XANES spectra reflect coordination environment and disorder in the surface to which a metal ion is sorbed. Specifically, XANES spectra for five distinct Zn adsorption complexes (Znads) on quartz and amorphous silica [SiO2(am)] are presented from the Zn–water–silica surface system: outer-sphere octahedral Znads on quartz, inner-sphere octahedral Znads on quartz, inner-sphere tetrahedral Znads on quartz, inner-sphere octahedral Z

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Ahmad, Majida K., Mais A. Mohammed, and Mahmood M. Barbooti. "Electrocoagulation for the Removal of Copper and Zinc Ions from Water Using Iron Electrodes." Open Chemistry Journal 7, no. 1 (2020): 37–43. http://dx.doi.org/10.2174/1874842202007010037.

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Background: Many methods have been suggested for the removal of heavy metals from water to protect human health and the environment. Methods like precipitation and adsorption were proposed for this purpose. Objective: Electrocoagulation involves the generation of coagulant by the action of electricity on two metal electrodes (iron or aluminium) to aid the process of water decontamination. Methods: Electrodeposition cell was made with iron electrodes and application of voltage from the power supply (5-25 V) dipped in the working solution (Cu and Zn) at various concentrations (10-50 mg.mL-1) for

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Ajala, L. O., and E. E. Ali. "Preparation and characterization of groundnut shell-based activated charcoal." Journal of Applied Sciences and Environmental Management 24, no. 12 (2021): 2139–46. http://dx.doi.org/10.4314/jasem.v24i12.20.

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Groundnut shell, an agricultural waste was used as a precursor for the preparation of activated charcoal using zinc chloride as a chemical activating agent. The results of the optimization studies showed that the activated charcoal had best iodine adsorption capacity at 1.0 mol dm-3 activator’s concentration, 2:1 impregnation ratio, 70 ℃ impregnation temperature, 12 hr impregnation time, 500 ℃ activation temperature, and 2hr activationtime. The surface chemistry of the adsorbent was studied by Fourier transform infra-red spectroscopy and scanning electron microscopy–energy dispersive X-ray spe

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Tse, Geoffrey, and Dapeng Yu. "The bandgap distribution investigated across the strain-induced bending ZnO nanowire." Modern Physics Letters B 30, no. 05 (2016): 1650048. http://dx.doi.org/10.1142/s0217984916500482.

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In this work, the strain dependence of electronic and optical properties in wurtzite zinc oxide (ZnO) lattice were explored. Ab initio density functional theory (DFT) was used in evaluating the energy bandgap and the dielectric tensor, respectively. The influence on the bandgap due to the shear distortion was so small that the reducing linear trends on uniaxial compressive/tensile strain were reported, in which the evolution of the absorption curve with uniaxial strain agrees well with the experimental results across the bending section. This study provides a set of useful data in analyzing th

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MYAKUSH, Oksana, and Leonid SYSA. "FEATURES OF EXTRACTION OF COPPER, ZINC AND NICKEL IONS FROM AQUEOUS SOLUTIONS BY NATURAL SORBENTS, ACTIVATED MICROWAVES." Proceedings of the Shevchenko Scientific Society. Series Сhemical Sciences 2020, no. 60 (2020): 55–67. http://dx.doi.org/10.37827/ntsh.chem.2020.60.055.

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The article is a continuation of a series of scientific works of the authors on the study of the influence of microwave irradiation on the sorption parameters of natural sorbents in the processes of purification of natural and wastewater. Using the atomic absorption method, the sorption ability of the natural sorbent clinoptilolite (zeolite type of structure) to remove Copper, Zinc and Nickel ions from aqueous solutions was studied. It was found that different variants of microwave activation of this mineral (series «Nat», «Stim» and «DIR») lead to a significant increase in the sorption capaci

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Ksandrov, Nikolai V., and Olga R. Ozhogina. "ADSORPTION OF AMMONIA WITH ACTIVATED COAL AG-3." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no. 8 (2018): 53. http://dx.doi.org/10.6060/ivkkt201861008.5726.

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The problem of NH3 extraction from wet gases and returning it to the process may take place in the technologies which use aqueous ammonia solutions. The extraction of non-ferrous metal oxides forming soluble ammoniates from industrial wastes with the solution of ammonium chloride and ammonia in water is an example of such technologies. The oxides of non-ferrous metals are then precipitated, driving the mixture of water vapor and ammonia off the solution. Waste purification reduces the pollution of natural water resources and expands the raw material base of metallurgy of copper and zinc. To re

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Miroshnychenko, N. N., and O. A. Kutz. "Selective absorption of heavy metals by soil and humic acids at different pH levels." Fundamental and Applied Soil Science 17, no. 1-2 (2016): 74–82. http://dx.doi.org/10.15421/041607.

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Studying processes of sorption-desorption of heavy metals from soil and its individual components allow to predict long-term effects under conditions of multielement contamination. Cations of heavy metals are showing competitive relationship due to their specific adsorption by components of the soil absorption complex, in particular humic acids. Interaction of chernozem podzolized heavy loam, isolated preparation of humic acids and soil residue after its removal with the solution which contain sulphates of Zn, Cd, Ni, Co and Cu in equal ratio were simulated at different pH levels. The task of

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Paninho, Ana B., Ana N. Mustapa, Kamran T. Mahmudov, et al. "A Bio-Based Alginate Aerogel as an Ionic Liquid Support for the Efficient Synthesis of Cyclic Carbonates from CO2 and Epoxides." Catalysts 11, no. 8 (2021): 872. http://dx.doi.org/10.3390/catal11080872.

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In this work, the ionic liquid [Aliquat][Cl] was supported into alginate and silica aerogel matrices and applied as a catalyst in the cycloaddition reaction between CO2 and a bio-based epoxide (limonene oxide). The efficiency of the alginate aerogel system is much higher than that of the silica one. The method of wet impregnation was used for the impregnation of the aerogel with [Aliquat][Cl] and a zinc complex. The procedure originated a well-defined thin solvent film on the surface of support materials. Final materials were characterised by Fourier Transform Infrared Spectroscopy, N2 Adsorpt

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Fathy, Alaa, Marie Le Pivert, Young Jai Kim, et al. "Continuous Monitoring of Air Purification: A Study on Volatile Organic Compounds in a Gas Cell." Sensors 20, no. 3 (2020): 934. http://dx.doi.org/10.3390/s20030934.

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Air pollution is one of the major environmental issues that humanity is facing. Considering Indoor Air Quality (IAQ), Volatile Organic Compounds (VOCs) are among the most harmful gases that need to be detected, but also need to be eliminated using air purification technologies. In this work, we tackle both problems simultaneously by introducing an experimental setup enabling continuous measurement of the VOCs by online absorption spectroscopy using a MEMS-based Fourier Transform infrared (FTIR) spectrometer, while those VOCs are continuously eliminated by continuous adsorption and photocatalys

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Shen, Bowen, Bixuan Wang, Liying Zhu, and Ling Jiang. "Properties of Cobalt- and Nickel-Doped Zif-8 Framework Materials and Their Application in Heavy-Metal Removal from Wastewater." Nanomaterials 10, no. 9 (2020): 1636. http://dx.doi.org/10.3390/nano10091636.

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Heterometallic zeolite imidazole framework materials (ZIF) exhibit highly attractive properties and have drawn increased attention. In this study, a petal-like zinc based ZIF-8 crystal and materials doped with cobalt and nickel ions were efficiently prepared in an aqueous solution at room temperature. It was observed that doped cobalt and nickel had obviously different effects on the morphology of ZIF-8. Cobalt ions were beneficial for the formation of ZIF-8, while addition of nickel ions tended to destroy the original configuration. Then we compared the absorption ability for metal ions betwe

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Rath, Himanshu Sekhar, Mira Das, Smita Rath, U. N. Dash, and Alakananda Tripathy. "Applications of Nanoparticles in Heavy Metal Removal for Wastewater Treatment at Brahmani River." Journal of Computational and Theoretical Nanoscience 17, no. 9 (2020): 4666–70. http://dx.doi.org/10.1166/jctn.2020.9296.

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The goal of this research is to determine the current standard of water quality along the Brahmani River stretch in terms of physico-chemical parameters. The River Brahmani receives a substantial amount of industrial waste in the identified study area and is witness to a large amount of human and agricultural activities. Nowadays Ninety percent of Brahmani’s required water is secured with groundwater resources and it is essential to forecast pollutant content in those resources. Hence, this research aimed at using of nanoparticles such as Activated Carbons (ACs) for removal of heavy metal such

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Amao, Yutaka, and Ichiro Okura. "Optical oxygen sensor devices using metalloporphyrins." Journal of Porphyrins and Phthalocyanines 13, no. 11 (2009): 1111–22. http://dx.doi.org/10.1142/s1088424609001455.

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Oxygen-monitoring techniques are applied to various fields, such as chemicals, deep sea environment, fluid dynamics, clinical analysis and environmental monitoring. Recently, a variety of devices and sensors based on phosphorescence or photoexcited state quenching of porphyrin molecules have been developed to measure oxygen concentration on the solid surface. Many optical oxygen sensors are composed of porphyrins (platinum(II), palladium(II), zinc(II), metal-free, etc.) dispersed in oxygen-permeable polymer film or directly immobilized onto solid surface via chemical or physical adsorption. Ox

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Silva, Jaíza Ribeiro Mota e., Luiz Fernando Coutinho de Oliveira, Camila Silva Franco, Juliano Elvis de Oliveira, and Bárbara Belchior Silvério. "Adsorption of metal ions in red marine algae Lithothamnium calcareum in the treatment of industrial effluents." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 5 (2021): 1. http://dx.doi.org/10.4136/ambi-agua.2740.

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This study investigated the adsorption capacity of the elements Chromium (Cr), Manganese (Mn) and Zinc (Zn) to marine algae Lithothamnium calcareum by means of adsorption kinetics and batch adsorption tests, with a view to the development of a simple technique for the treatment of effluents that have a high concentration of metal ions. The algae was sieved, washed and subjected to treatment. In the adsorption kinetics, 0.2 g of algae was weighed, an amount transferred to 125 mL Erlenmeyer flasks, to which was added 15 mL of solution with a concentration of 5 mg L-1 of the metal ion. The flasks

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Wang, Li Qin, Xiang Ni Yang, Xiu Li Zhao, Yang Han, Rui Jun Zhang, and Yu Lin Yang. "Synthesis and Recycle of ZnO Particles for Degradation of Methyl Orange Aqueous Solution." Applied Mechanics and Materials 121-126 (October 2011): 587–91. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.587.

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The ZnO particles with mesoporous and lamellar structure were synthesized in the method of precipitation, using zinc acetate as precursor. The ZnO particles were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and N2 adsorption–desorption measurements. The photoactivity of as-prepared ZnO particles was evaluated by degradation experiment of methyl orange aqueous solution. The results showed the obtained ZnO particles were irregular polygons with lamellar structure, and the particle size was in the range of 50 nm to 300 nm. According to XRD and N

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Andrade-Guel, M., C. A. Ávila-Orta, C. Cabello-Alvarado, et al. "Non-Woven Fabrics Based on Nanocomposite Nylon 6/ZnO Obtained by Ultrasound-Assisted Extrusion for Improved Antimicrobial and Adsorption Methylene Blue Dye Properties." Polymers 13, no. 11 (2021): 1888. http://dx.doi.org/10.3390/polym13111888.

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Approximately 200,000 tons of water contaminated with dyes are discharged into effluents annually, which in addition to infectious diseases constitute problems that afflict the population worldwide. This study evaluated the mechanical properties, surface structure, antimicrobial performance, and methylene blue dye-contaminant adsorption using the non-woven fabrics manufactured by melt-blowing. The non-woven fabrics are composed of nylon 6 (Ny 6) and zinc oxide nanoparticles (ZnO NPs). The polymer nanocomposites were previously fabricated using variable frequency ultrasound assisted-melt-extrus

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Carisma, Nikko Angelo S., Reniza Yvonne E. Gonzales, and Nancy Lazaro-Llanos. "An Investigation on Zinc Biosorption with Agar Extraction Waste from Gracilaria tenuistipitata." KIMIKA 31, no. 2 (2020): 11–26. http://dx.doi.org/10.26534/kimika.v31i2.11-26.

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This study determined the biosorption capacity of algal waste, obtained through agar extraction from Gracilaria tenuistipitata, a common red seaweed in the Philippines and potential biosorbent, on Zn2+ ions. Agar was extracted from the seaweed and characterized through Fourier-transform infrared spectroscopy (FT-IR). The algal waste was then subjected to a biosorption study involving various Zn2+ standards. Atomic absorption spectroscopy (AAS) and FT-IR were employed to evaluate sorption processes. Biosorption data was analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isother

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Qin, YL, WW Zhao, Z. Sun, et al. "Photocatalytic and adsorption property of ZnS–TiO2/RGO ternary composites for methylene blue degradation." Adsorption Science & Technology 37, no. 9-10 (2018): 764–76. http://dx.doi.org/10.1177/0263617418810932.

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The visible light–driven ZnS–TiO2/RGO nanocomposites, with good visible light–driven photocatalytic activity, utilizing graphene oxide as precursor, were successfully synthesized via a facile solvothermal thermal method with graphene oxide as precursor. Ti4+ ions were derived from titanium dioxide powder (TiO2, P25) and tetrabutyl titanate. S2− ions and Zn2+ ions were provided by sodium sulfide and zinc acetate, respectively. The photocatalytic and absorbance activity of the nanocomposites was investigated through the photocatalytic degradation of methylene blue in aqueous solution. The result

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Li, Hongji, Yu Zhang, Jiaqi Diao, Mengmeng Qiang, and Zhe Chen. "Synthesis and Photocatalytic Activity of Hierarchical Zn-ZSM-5 Structures." Catalysts 11, no. 7 (2021): 797. http://dx.doi.org/10.3390/catal11070797.

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Hierarchical Zn-ZSM-5 photocatalyst structures were synthesized via a hydrothermal one-pot synthesis route using a double template. Activated attapulgite (Si-ATP) and zinc nitrate (Zn(NO3)2) precursors were used as silicon and zinc sources, respectively. The structural properties, morphology, photocatalytic activity and the texture properties of the synthesized Zn-ZSM-5 photocatalysts were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), diffracted ultraviolet–visible (UV–Vis) spectrometry (DRUV–Vis) and N2 adsorption/desorption, respectively. It was found that t

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Ahmady-Asbchin, Salman, and Naser Jafari. "Removal of nickel and zinc from single and binary metal solutions by Sargassum angustifolium." Water Science and Technology 68, no. 6 (2013): 1384–90. http://dx.doi.org/10.2166/wst.2013.375.

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The capability of Sargassum angustifolium in removing nickel (Ni) (II) and zinc (Zn) (II) from single and binary metal solution was determined. In binary solution the presence of the secondary metal inhibited the sorption of the primary metal by S. angustifolium but the inhibitory effect of Ni during sorption of Zn is stronger than the inhibitory effect of Zn in absorption of Ni. The total metal (Ni + Zn) sorbed from the binary metal solution by S. angustifolium cells always remained lower than the total sorption of individual metals from their respective single metal solutions, thereby sugges

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Singh, Surendra, Anshuman Sahai, S. C. Katyal, and Navendu Goswami. "Structural, optical and vibrational study of zinc copper ferrite nanocomposite prepared by exploding wire technique." Materials Science-Poland 36, no. 4 (2018): 722–32. http://dx.doi.org/10.2478/msp-2018-0084.

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AbstractWe have synthesized zinc-copper ferrite (ZCFO) employing exploding wire technique (EWT). The X-ray diffraction (XRD) data confirm the formation of single phase spinel ZCFO, which is in good agreement with Fourier transform infrared spectroscopy (FT-IR), UV-Vis, and Raman spectroscopic analyses. It is also clearly seen in the SEM micrographs that the grains in ZCFO ferrite are very rough, which allows adsorption of gas like oxygen and therefore, the material can behave as active sensing surface. The size range of the grains in prepared sample is of 200 nm to 500 nm. The FT-IR spectrum o

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Lonzinger, Tatiana M., Vadim A. Skotnikov, and Alexey M. Sukharev. "Study of the Process of Heavy Metals Cations Mineralization by Poly-Component Structures Based on Calcium and Magnesium Silicates." Materials Science Forum 989 (May 2020): 103–9. http://dx.doi.org/10.4028/www.scientific.net/msf.989.103.

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In order to achieve the goal of absorption of environmental pollutants, poly-component materials based on magnesium and calcium silicates - metal cations mineralizers – have been synthesized. The study of the processes of mineralization was carried out using model solutions containing soluble sulphates of copper, zinc, manganese and iron. The studies carried out have shown that the synthesized mineralizer based on calcium and magnesium silicates has a multicomponent structure with active electrochemically inhomogeneous centres on its surface as a result of breaking the Ca-O-Si, Mg-O-Si bonds,

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Yuan, Xiaoya, Zijuan Feng, Jianjun Zhao, et al. "Significantly Enhanced Aqueous Cr(VI) Removal Performance of Bi/ZnO Nanocomposites via Synergistic Effect of Adsorption and SPR-Promoted Visible Light Photoreduction." Catalysts 8, no. 10 (2018): 426. http://dx.doi.org/10.3390/catal8100426.

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Bismuth nanoparticles (BiNPs) and Zinc Oxide photocatalysts (BiNPs/ZnO) with different Bi loadings were successfully prepared via a facile chemical method. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis (Ultraviolet-Visible) diffuse reflectance spectroscopy (DRS), photoluminescence spectra (PL), and electrochemical impedance spectroscopy (EIS). The results showed that a modification of hexagonal wurtzite-ph

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Mohamad Zubir, Hamizah Syahirah, Mohd Haniff Wahid, Irene Ling, Hong Ngee Lim, Sazlinda Kamaruzaman, and Zulkarnain Zainal. "Preparation and characterization of p-sulfonated calix[4]arene functionalized chitosan hydrogel beads and their preliminary adsorption study towards removal of lead(II) and zinc(II) ions." Malaysian Journal of Fundamental and Applied Sciences 16, no. 4 (2020): 429–32. http://dx.doi.org/10.11113/mjfas.v16n4.1765.

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p-sulfonated calix[4]arene functionalized chitosan hydrogel beads have been successfully prepared by mixing p-sulfonated calix[4]arene and chitosan in dilute acetic acid solution (1% v/v), followed by dropping the mixture into sodium hydroxide solution to form beads with diameters of ~0.1 cm. The presence of the active sulfonate groups and the unique structure of calixarene render the material useful as an adsorbent for heavy metal ions. Metal adsorption on p-sulfonated calix[4]arene is possible through a combination of physical and ionic interactions. Atomic Absorption Spectroscopy (AAS) resu

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Stietiya, M. Hashem, Jim J. Wang, and Amitava Roy. "Macroscopic and Extended X-ray Absorption Fine Structure Spectroscopic Investigation of Ligand Effect on Zinc Adsorption to Kaolinite as a Function of pH." Soil Science 176, no. 9 (2011): 464–71. http://dx.doi.org/10.1097/ss.0b013e3182285b46.

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