Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms
Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms
复制标题
零价铁与弱磁场耦合对 EDTA 螯合 CuII 的解络和随后还原去除：性能和机制
DOI：
10.1016/j.jhazmat.2015.07.070
复制
发表时间：
2015
影响因子：
13.6
通讯作者：
Gongming Zhou
中科院分区：
文献类型：
--
作者：
Xiaohong Guan;Xiao Jiang;Junlian Qiao;Gongming Zhou
The feasibility of EDTA-chelated CuII(CuII-EDTA) removal by zero-valent iron (Fe0) in the presence of a weak magnetic field (WMF) and the involved mechanisms were systematically investigated. Fe0combined with WMF (Fe0/WMF) was very effective for removing CuII-EDTA at pH 4.0–6.0 with the rate constants ranging from 0.1190 min−1to 0.0704 min−1. Little passivation of Fe0was observed during CuII-EDTA removal by Fe0/WMF in 8 consecutive runs when 10.0 mg L−1CuII-EDTA was dosed before the initiation of each run. The evidences presented in this study verified that CuII-EDTA was removed by decomplexation followed by reduction/adsorption. In brief, FeIIreleased from Fe0corrosion was rapidly oxidized by oxygen to FeIIIto chelate with EDTA and release free CuII, and the detached CuIIions were subsequently reduced/removed by Fe0/FeIIand co-precipitated by the generated iron (hydr)-oxides. To advance the application of Fe0/WMF technology in real practice, a magnetic propeller agitator was designed to offer WMF inside the reactor, which could greatly improve CuII-EDTA removal by Fe0and be easily amplified.
