Journal
CHEMICAL ENGINEERING JOURNAL
Volume 288, Issue -, Pages 789-797Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.12.022
Keywords
Nanoscale zerovalent iron; Graphene; Removal; Reduction; Chromium
Categories
Funding
- National Natural Science Foundation of China [21207108, 51572227]
- Sichuan Youth Science and Technology Foundation [2013JQ0012]
- Research Foundation of CWNU [12B018, 14E016]
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Chemical reduction technology based on nanoscale zerovalent iron (NZVI) is an effective method for in situ remediation of Cr(VI)-polluted water. However, it is difficult to overcome the associated surface passivation during the reaction process, thus losing the reduction reactivity. In this study, a novel system based on the NZVI/graphene nanosheets (NZVI/GNS) is constructed for the effective removal of Cr(VI) in water. Immobilization of NZVI onto graphene improves the stability of the NZVI, while graphene coupling facilitates the electron transfer in the NZVI and retards the surface passivation of the NZVI, thus enhancing the performance of the NZVI toward Cr(VI) removal. The NZVI/GNS exhibits significantly higher activity toward Cr(VI) removal than that of bare NZVI. The Cr(VI) removal efficiency is closely correlated to the graphene amounts in the NZVI/GNS. Based on X-ray photoelectron spectroscopy (XPS) and steady-state polarization measurements, the mechanism of Cr(VI) reduction reaction with the NZVI/GNS has been unraveled as well. (C) 2015 Elsevier B.V. All rights reserved.
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