Adsorption of Cr(VI) onto cationic surfactant-modified activated carbon

Title
Adsorption of Cr(VI) onto cationic surfactant-modified activated carbon
Authors
최현덕정우성조정민류병곤양중석백기태
Keywords
Cr(VI); Hexadecyltrimethylammonium bromide; Cetylpyridinium chloride; Surface-modification; Surfactant
Issue Date
2009-07
Publisher
Journal of hazardous materials
Citation
VOL 166, NO 2-3, 642-646
Abstract
Highly toxic oxyanions, such as hexavalent chromium (Cr(VI)), have caused adverse effects on human health. This study evaluated the feasibility of using cationic surfactant-modified activated carbon (AC) to remove Cr(VI). To modify activated carbon using a cationic surfactant, AC was mixed with a surfactant solution of 0.5 critical micelle concentration (CMC), at which concentration the surfactant molecules exist as mono-molecules. Adsorption kinetics and an isotherm model were used to study the adsorption characteristics of Cr(VI) onto MAC. The adsorption capacity of MAC for Cr(V) was enhanced compared to that of AC. MAC modified by hexadecyltrimethylammonium had a higher adsorption capacity for the removal of Cr(VI) than that modified by cetylpyridinium. The modification of AC by a cationic surfactant enhanced both its Cr(VI) adsorption rate and its Cr(VI) adsorption capacity. The breakthrough point of MAC for Cr(VI) was 100 times greater than for the raw AC. As a result, MAC is a promising adsorbent to treat Cr(VI) in an aqueous stream.
URI
http://pubs.kist.re.kr/handle/201004/36762
ISSN
0304-3894
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KIST Publication > Article
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