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Vol. 27 No. 5 (2015): Vol 27 Issue 5

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Comparison of Cationic Surfactants for Activated Carbon Modification for Cr(VI) Removal

https://doi.org/10.14233/ajchem.2015.17903
W.F. Chen
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
J.H. Zhang
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
W.Y. Wang
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
X.M. Zhang
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China

Corresponding Author(s) : W.F. Chen

chenzjzj@gmail.com

Asian Journal of Chemistry, Vol. 27 No. 5 (2015): Vol 27 Issue 5

Abstract

The study investigated the effect of cationic surfactants [e.g., cetyltrimethylammonium chloride (CTAC), myristyltrimethylammonium bromide (MTAB) and decyltrimethylammonium bromide (DTAB)] loading on activated carbon and application of these modified carbons for Cr(VI) removal from aqueous phase. Adsorption isotherm tests indicate that the surfactant modification method was effective in improving activated carbon's adsorption capacity. At best, CTAC-modified carbon was able to adsorb 64.10 mg Cr(VI)/g at pH 6 as compared to that of 5.53 mg/g for virgin GAC. Langmuir isotherm and pseudo-second-order kinetics models were found to describe well the Cr(VI) adsorption behaviour on activated carbon. Also, adsorption of Cr(VI) decreased slightly with the increase of pH from 2 to 8 while adsorption was highly dependent on pH at pH 8-11. In addition, surfactant's attachment to carbon surface was strong and less than 5 % of the surfactant desorbed during Cr(VI) adsorption.

Keywords

Activated carbon Cationic surfactant Cr(VI) Adsorption
Chen, W., Zhang, J., Wang, W., & Zhang, X. (2015). Comparison of Cationic Surfactants for Activated Carbon Modification for Cr(VI) Removal. Asian Journal of Chemistry, 27(5), 1791–1797. https://doi.org/10.14233/ajchem.2015.17903
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