Reduction and Removal of Aqueous Cr(VI) by Glow Discharge Plasma at the Gas-Solution Interface

被引：113
作者：
Ke, Zhigang [1 ]
Huang, Qing [1 ]
Zhang, Hong [1 ]
Yu, Zengliang [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Ion Beam Bioengn, Inst Biotechnol & Agr Engn, Hefei Inst Phys Sci, Beijing 100864, Peoples R China
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2011年 / 45卷 / 18期
关键词：
HEXAVALENT CHROMIUM REMOVAL; PHOTOCATALYTIC REDUCTION; WASTE-WATER; QUANTIFICATION; ELECTRODES; CONSTANTS; OXIDATION; SURFACE;
D O I：
10.1021/es201680m
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Aqueous chromium(VI) reduction and removal induced by glow discharge taking place at the gas-solution interface in an argon atmosphere was studied. The effect of initial pH and hydroxyl radical scavenger (ethanol) on the reduction efficiency was examined. High reduction efficiency was obtained when initial pH <= 2.0 or >= 8.0. In particular, addition of ethanol into the solution substantially increased the reduction efficiency and facilitated chromium removal from the solution in the form of sediment after discharge. The optimum pH values for Cr(VI) removal were within 6.0-7.0. Fourier transform-infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis confirmed that the main constituent of the sediment is chromium hydroxide.
引用
收藏
页码：7841 / 7847
页数：7
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