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Hexavalent chromium removal from aqueous solution by adsorbents synthesized from groundwater treatment residuals

Hexavalent chromium removal from aqueous solution by adsorbents synthesized from groundwater treatment residuals

Authors :
Chi-Chuan Kan
Aldwin H. Ibe
Kim Katrina P. Rivera
Renato O. Arazo
Mark Daniel G. de Luna
Source :
Sustainable Environment Research, Vol 27, Iss 4, Pp 163-171 (2017)
Publication Year :
2017
Publisher :
BMC, 2017.

Abstract

In this study, silica sand coated with groundwater treatment residuals was used as adsorbents for the removal of hexavalent chromium from synthetic wastewater. Batch adsorption experiments were conducted to evaluate the effects of initial Cr(VI) concentration, solution pH, adsorbent dosage, solution temperature, contact time, as well as ionic strength on Cr(VI) removal. Results show that low solution pH and high ionic strength improve Cr(VI) adsorption onto the residual coated sand. At pH 4, the highest adsorption capacity was computed at 0.27 mg g−1. The Freundlich isotherm model best described the adsorption process. From 298 to 318 K, the high correlation of the kinetic data with the pseudo-second order model (R2 > 0.981) and a highly positive activation energy value (22.7 kJ mol−1) indicate that chemisorption is the rate-controlling step of the adsorption process.

Details

Language :
English
ISSN :
24682039
Volume :
27
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Sustainable Environment Research
Publication Type :
Academic Journal
Accession number :
edsdoj.230e29deadc4ade97fce56fd60e40c2
Document Type :
article
Full Text :
https://doi.org/10.1016/j.serj.2017.04.001