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J Environ Manage. 2013 Oct 15;128:822-7. doi: 10.1016/j.jenvman.2013.06.044. Epub 2013 Jul 15.

Chromium removal using resin supported nanoscale zero-valent iron.

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  • 1School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. fufenglian2006@163.com

Abstract

Resin supported nanoscale zero-valent iron (R-nZVI) was synthesized by the borohydride reduction method. Batch experiments were conducted to evaluate the factors affecting Cr(VI) removal. It was found that nZVI loads, resin dose, pH value and initial concentration of Cr(VI) were all important factors. Scanning electron microscopy showed that the nZVI particles in R-nZVI became sphere after reacting with Cr(VI). This phenomenon was attributed to the co-precipitation of Cr(III) and Fe(III) on the surface of resin. X-ray diffraction pattern confirmed that Fe(0) diminished after the reaction. At optimum conditions, the Cr(VI) removal efficiency was 84.4% when the initial concentration of Cr(VI) was 20.0 mg/L. Regeneration of R-nZVI and resin was possible. R-nZVI can also remove Cr(III) efficiently. However, the removal mechanisms of Cr(VI) (anion) and Cr(III) (cation) are different. The former is chemical reduction, while the latter is ion exchange at pH below 6.3 and precipitation at pH above 6.3. This study demonstrates that R-nZVI has the potential to become an effective agent for treating wastewater containing Cr(VI) and Cr(III).

Crown Copyright © 2013. Published by Elsevier Ltd. All rights reserved.

KEYWORDS:

Chromium removal; Cr(VI) wastewater; Nanoscale zero-valent iron (nZVI); Resin; Support

PMID:
23867839
[PubMed - indexed for MEDLINE]
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