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Open AccessArticle

Reduction and Removal of Chromium VI in Water by Powdered Activated Carbon

by Yanan Chen 1,2, Dong An 1,2,*, Sainan Sun 1,2, Jiayi Gao 1 and Linping Qian 3
1
Department of Environmental Science & Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China
2
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
3
Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(2), 269; https://doi.org/10.3390/ma11020269
Received: 18 January 2018 / Revised: 31 January 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
(This article belongs to the Special Issue Green Activated Carbons)
Cr adsorption on wood-based powdered activated carbon (WPAC) was characterized by scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The highest Cr(VI) adsorption (40.04%) was obtained under acidic conditions (pH 3), whereas Cr removal at pH 10 was only 0.34%. The mechanism of Cr(VI) removal from aqueous solutions by WPAC was based on the reduction of Cr(VI) to Cr(III) with the concomitant oxidation of C-H and C-OH to C-OH and C=O, respectively, on the surface of WPAC, followed by Cr(III) adsorption. Raman spectroscopy revealed a change in the WPAC structure in terms of the D/G band intensity ratio after Cr(VI) adsorption. SEM-EDS analysis showed that the oxygen/carbon ratio on the WPAC surface increased from 9.85% to 17.74%. This result was confirmed by XPS measurements, which showed that 78.8% of Cr adsorbed on the WPAC surface was in the trivalent state. The amount of oxygen-containing functional groups on the surface increased due to the oxidation of graphitic carbons to C-OH and C=O groups. View Full-Text
Keywords: chromium; activated carbon; wastewater; adsorption chromium; activated carbon; wastewater; adsorption
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Chen, Y.; An, D.; Sun, S.; Gao, J.; Qian, L. Reduction and Removal of Chromium VI in Water by Powdered Activated Carbon. Materials 2018, 11, 269.

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