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Lee, Changha
Advanced Redox Technology (ART) Lab
Research Interests
  • Water Treatment, Advanced Oxidation/Reduction, Water Chemistry, Environmental Catalyst

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Distinctive green recovery of silver species from modified cellulose: Mechanism and spectroscopic studies

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Title
Distinctive green recovery of silver species from modified cellulose: Mechanism and spectroscopic studies
Author
Dwivedi, Amarendra DharDubey, Shashi PrabhaSillanpaa, MikaLiimatainen, HenrikkiSuopajarvi, TerhiNiinimaki, JoukoKwon, Young-NamLee, Changha
Issue Date
2015-05
Publisher
ELSEVIER SCIENCE BV
Citation
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, v.76, pp.109 - 118
Abstract
The present study aimed to recover precious silver in order to identify the adsorption coupled reduction pathways that determine this process. A combination technique of adsorption and nanocrystallization was used to investigate the recovery of silver species from taurine-cellulose (T-DAC) samples. The non-synthetic route of nanocrystallization yielded spherical zero-valent silver sized ~18. nm. Rate-controlling steps were modeled by adsorption parameters by the best fit of Langmuir capacity (55. mg/g), pseudo-second order curves, and exothermic chemical reactions. The T-DAC was an excellent sorbing phase for the treatment of silver-polluted waters over a broad range of pH (2.1-10.1) and varying ionic strengths (8.5-850. mM, as NaCl), which are the conditions often encountered in industrial and mining effluents. A good recovery of silver (40-65%) was also obtained in the presence of Cd(II), Co(II), Cr(VI), Ni(II), and As(V) at lower or equivalent concentrations with Ag(I), either from individually added metals or from all metal ions mixed together. Desorption was compared with a series of five eluents including complexing agents. In these experiments acidified thiourea yielded 86% desorption of Ag(I). Aqueous silver reduced to metallic silver on the surface of the T-DAC samples, which was confirmed by X-ray photo electron spectroscopy. © 2015 Elsevier B.V
URI
https://scholarworks.unist.ac.kr/handle/201301/11047
URL
http://www.sciencedirect.com/science/article/pii/S014181301500118X
DOI
10.1016/j.ijbiomac.2015.02.032
ISSN
0141-8130
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