Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms

被引：84
作者：
Guan, Xiaohong [1 ]
Jiang, Xiao [1 ]
Qiao, Junlian [1 ]
Zhou, Gongming [1 ]
机构：
[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2015年 / 300卷
基金：
中国国家自然科学基金;
关键词：
Cu-II-EDTA; Fe-0/WMF; Decomplexation; Reduction; Magnetic propeller agitator; PHOTOCATALYTIC OXIDATION; AQUEOUS-SOLUTIONS; CU(II)-EDTA; ADSORPTION; WASTEWATERS; DEGRADATION; EDTA-CU(II); RECOVERY; COPPER; WASTE;
D O I：
10.1016/j.jhazmat.2015.07.070
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The feasibility of EDTA-chelated Cu-II (Cu-II-EDTA) removal by zero-valent iron (Fe-0) in the presence of a weak magnetic field (WMF) and the involved mechanisms were systematically investigated. Fe-0 combined with WMF (Fe-0/WMF) was very effective for removing Cu-II-EDTA at pH 4.0-6.0 with the rate constants ranging from 0.1190 min(-1) to 0.0704 min(-1). Little passivation of Fe-0 was observed during Cu-II-EDTA removal by Fe-0/WMF in 8 consecutive runs when 10.0 mg L-1 Cu-II-EDTA was dosed before the initiation of each run. The evidences presented in this study verified that Cu-II-EDTA was removed by decomplexation followed by reduction/adsorption. In brief, Fe-II released from Fe-0 corrosion was rapidly oxidized by oxygen to Fe-II to chelate with EDTA and release free Cu-II, and the detached Cu-II ions were subsequently reduced/removed by Fe-0/Fe-II and co-precipitated by the generated iron (hydr)oxides. To advance the application of Fe-0/WMF technology in real practice, a magnetic propeller agitator was designed to offer WMF inside the reactor, which could greatly improve Cu-II-EDTA removal by Fe-0 and be easily amplified. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：688 / 694
页数：7
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