Adsorption of nitrate and Cr(VI) by cationic polymer-modified granular activated carbon

Title
Adsorption of nitrate and Cr(VI) by cationic polymer-modified granular activated carbon
Author
전병훈
Keywords
Nitrate; Chromium; Cationic polymer; Granular activated carbon; Adsorption; Trimethlyammonium chloride
Issue Date
2011-09
Publisher
ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Citation
Chemical Engineering Journal, Vol.75, No.1 [2011], p298-305
Abstract
Modified granular activated carbon was prepared by coating quaternary ammonium-containing polymer [3-(methacryloylamino)propyl]-trimethylammonium chloride, onto granular activated carbon (GAC) to remove nitrate and Cr(VI) from aqueous solution. The removal efficiencies for nitrate and Cr(VI) increased as the concentration of the cationic polymer used for modification increased to 0.25%, but those decreased slightly when the polymer concentration further increased to 2.5%. Kinetics experiments indicated the adsorption was a fast process, reaching equilibrium in 90 and 120 min for nitrate and Cr(VI) adsorption, and the maximum equilibrium uptake of nitrate and Cr(VI) were about 26 and 81 mg g(-1), respectively. The adsorption of both anions was well described by pseudo-second-order kinetics model and Langmuir isotherm model. There was a linear relationship between the amounts of desorbed chloride and adsorbed nitrate and Cr(VI), suggesting the main effect of modification was enhancement of ion exchange capacity of GAC. The thermodynamic data showed that adsorption process would be thermodynamically favorable, spontaneous, and exothermic nature. The adsorption capacity for Cr(VI) decreased continuously with an increase in initial solution pH from 3 to 8 but such an effect was less significant for nitrate. The nitrate and Cr(VI) adsorption decreased the most in the presence of sulfate, followed by chloride and phosphate. The overall results demonstrated the potential utility of a cationic polymer for enhancement of performances of GAC-based materials for anions removal from aqueous solutions.
URI
https://www.sciencedirect.com/science/article/pii/S1385894711011818?via%3Dihub
ISSN
1385-8947
DOI
10.1016/j.cej.2011.09.108
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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