Optimization of electrochemical dechlorination of trichloroethylene in reducing electrolytes.
Optimization of electrochemical dechlorination of trichloroethylene in reducing electrolytes.
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DOI：
10.1016/j.watres.2012.01.002
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发表时间：
2012-04-15
期刊：
影响因子：
12.8
通讯作者：
Alshawabkeh, Akram N.
中科院分区：
文献类型：
--
作者：
Mao, Xuhui;Ciblak, Ali;Baek, Kitae;Amiri, Mohammad;Loch-Caruso, Rita;Alshawabkeh, Akram N.
在密闭的循环液中研究了三氯乙烯（TCE）水溶液的电化学脱氯。铸铁的阳极反应产生亚铁物质，产生化学还原电解质（负ORP值）。在这种还原性电解质中，由于没有电子竞争，阴极表面上的TCE的还原被增强。在铁阳极存在的情况下，在循环电解系统中比较了不同阴极的性能。泡沫铜对三氯乙烯水溶液具有上级脱氯性能。通过多变量实验设计和分析，进一步优化了铸铁阳极和泡沫铜阴极电解。电解质的电导率被确定为TCE的最终消除效率（FEE）和比能耗的重要因素。泡沫铜电极在较宽的TCE初始浓度范围内表现出较高的TCE去除效率。在恒电量条件下，实现最高FEE的最佳条件是9.525 mm厚的泡沫铜电极，40 mA电流和0.042 mol L−1 Na2SO4。这种新型的电解系统被提出来修复被氯化有机溶剂污染的地下水，或者作为一种改进的铁电凝聚工艺能够处理与氯化化合物共污染的废水。
Electrochemical dechlorination of trichloroethylene (TCE) in aqueous solution is investigated in a closed, liquid-recirculation system. The anodic reaction of cast iron generates ferrous species, creating a chemically reducing electrolyte (negative ORP value). The reduction of TCE on the cathode surface is enhanced under this reducing electrolyte because of the absence of electron competition. In the presence of the iron anode, the performances of different cathodes are compared in a recirculated electrolysis system. The copper foam shows superior capability for dechlorination of aqueous TCE. Electrolysis by cast iron anode and copper foam cathode is further optimized though a multivariable experimental design and analysis. The conductivity of the electrolyte is identified as an important factor for both final elimination efficiency (FEE) of TCE and specific energy consumption. The copper foam electrode exhibits high TCE elimination efficiency in a wide range of initial TCE concentration. Under coulostatic conditions, the optimal conditions to achieve the highest FEE are 9.525 mm thick copper foam electrode, 40 mA current and 0.042 mol L−1 Na2SO4. This novel electrolysis system is proposed to remediate groundwater contaminated by chlorinated organic solvents, or as an improved iron electrocoagulation process capable of treating the wastewater co-contaminated with chlorinated compounds.
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影响因子：
3.4
作者：
Aulenta, Federico;Canosa, Andrea;Majone, Mauro
通讯作者：
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影响因子：
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作者：
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通讯作者：
Alshawabkeh, Akram N.
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作者：
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