电化学
过滤(数学)
阳极
膜
化学
金属
阴极
电池电压
螯合作用
微生物燃料电池
无机化学
电极
有机化学
生物化学
统计
物理化学
数学
作者
Jiayi Li,Jinxing Ma,Ruobin Dai,Xueye Wang,Mei Chen,T. David Waite,Zhiwei Wang
标识
DOI:10.1021/acs.est.0c05554
摘要
Heavy metals in industrial wastewaters are typically present as stable metal–organic complexes with their cost-effective treatment remaining a significant challenge. Herein, a self-enhanced decomplexation scenario is developed using an electrochemical membrane filtration (EMF) system for efficient decomplexation and Cu recovery. Using Cu-EDTA as a model pollutant, the EMF system achieved 81.5% decomplexation of the Cu-EDTA complex and 72.4% recovery of Cu at a cell voltage of 3 V. The •OH produced at the anode first attacked Cu-EDTA to produce intermediate Cu-organic complexes that reacted catalytically with the H2O2 generated from the reduction of dissolved oxygen at the cathode to initiate chainlike self-enhanced decomplexation in the EMF system. The decomplexed Cu products were further reduced or precipitated at the cathodic membrane surface thereby achieving efficient Cu recovery. By scavenging H2O2 (excluding self-enhanced decomplexation), the rate of decomplexation decreased from 8.8 × 10–1 to 4.1 × 10–1 h–1, confirming the important role of self-enhanced decomplexation in this system. The energy efficiency of this system is 93.5 g kWh–1 for Cu-EDTA decomplexation and 15.0 g kWh–1 for Cu recovery, which is much higher than that reported in the previous literature (i.e., 7.5 g kWh–1 for decomplexation and 1.2 g kWh–1 for recovery). Our results highlight the potential of using EMF for the cost-effective treatment of industrial wastewaters containing heavy metals.
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