Nanoscale zerovalent iron decorated on graphene nanosheets for Cr(VI) removal from aqueous solution: Surface corrosion retard induced the enhanced performance

被引：228
作者：
Li, Xingyue [1 ]
Ai, Lunhong [1 ]
Jiang, Jing [1 ]
机构：
[1] China West Normal Univ, Coll Chem & Chem Engn, Chem Synth & Pollut Control Key Lab Sichuan Prov, Nanchong 637002, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2016年 / 288卷
基金：
中国国家自然科学基金;
关键词：
Nanoscale zerovalent iron; Graphene; Removal; Reduction; Chromium; ZERO-VALENT IRON; COPPER(II) IONS; WASTE-WATER; FE-AT-FE2O3; NANOWIRES; CONJUGATE ADSORBENT; GRAPHITE OXIDE; TAILOR-MADE; CHROMIUM VI; LIGAND; NANOPARTICLES;
D O I：
10.1016/j.cej.2015.12.022
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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.
引用
收藏
页码：789 / 797
页数：9
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