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A WO3/PPy/ACF modified electrode in electrochemical system for simultaneous removal of heavy metal ion Cu2+ and organic acid.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.jhazmat.2020.122534
Jiaqi Sun 1 , Lifen Liu 2 , Fenglin Yang 1
Affiliation  

Heavy metal ions and organic acids are common pollutants in electroplating wastewater. Effective and economic treatment of such wastewater needs novel technologies. In this study, WO3/PPy-1/ACF electrode was prepared using a hydrothermal modification method and it has large specific area (788.27 m2 g-1), high areal capacitance (2.58 F cm-2 under 5 mA cm-2 charge and discharge) and excellent conductivity. The modified electrode was used in an electrochemical system with activated carbon fiber felt (ACF) as counter electrode. The system simultaneously and successfully removed 97.8 % Cu2+ and 80.1 % citric acid (CA) from a simulated electroplating wastewater (typically 100 mg L-1 Cu2+ and 800 mg L-1 CA) in five- hour optimized operation. The influence of operating parameters (circulating inflow rate, applied voltage and influent pH) on the treatment performance was compared. There is interplay between Cu2+ reductive deposition and CA oxidation. The synergetic electrochemical treatment mechanism involves formation of hydrogen peroxide, free radicals, and catalytic effect of Cu species was proposed. This electrochemical system which is low-cost, easy to operate and highly efficient, may be applicable in treating acid-wash or electroplating wastewater, containing heavy-metal ions and organic acids.

中文翻译:

电化学系统中的WO3 / PPy / ACF修饰电极,用于同时去除重金属离子Cu2 +和有机酸。

重金属离子和有机酸是电镀废水中的常见污染物。有效和经济地处理此类废水需要新颖的技术。在这项研究中,WO3 / PPy-1 / ACF电极采用水热改性方法制备,具有大的比表面积(788.27 m2 g-1),高的面电容(在5 mA cm-2的电荷下为2.58 F cm-2和放电)和出色的导电性。改性电极用于活性炭纤维毡(ACF)作为反电极的电化学系统中。该系统在五小时的优化运行中,成功地从模拟电镀废水(通常为100 mg L-1 Cu2 +和800 mg L-1 CA)中去除了97.8%的Cu2 +和80.1%的柠檬酸(CA)。操作参数的影响(循环流量,比较施加电压和进水pH)对处理性能的影响。Cu2 +还原沉积与CA氧化之间存在相互作用。协同电化学处理机理涉及过氧化氢,自由基的形成,并提出了Cu物种的催化作用。这种低成本,易于操作和高效的电化学系统可用于处理酸洗或电镀废水,其中含有重金属离子和有机酸。
更新日期:2020-03-12
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