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An effective electrochemical destruction of non-ionic surfactants on bismuth-modified lead dioxide anodes for wastewater pretreatment
Journal of Solid State Electrochemistry ( IF 2.6 ) Pub Date : 2020-01-02 , DOI: 10.1007/s10008-019-04483-3
V. V. Kuznetsov , E. S. Kapustin , A. V. Pirogov , K. A. Kurdin , E. A. Filatova , V. A. Kolesnikov

Non-ionic surfactants are permanent components of wastewater of various origins, and their removal is necessary for sewage treatment. A new method of electrochemical treatment of wastewater for non-ionic surfactant destruction has been proposed. Effective destruction of both alkoxylated and phenoxylated non-ionic surfactants was performed using β-Pb1–xBixO2–0.5x anodes prepared by electrodeposition. The method proposed is based on the generation of active oxygen-containing species (e.g., OH, HO2) at the anode followed by chemical interaction between these radicals and organic molecules, which results in the destruction of pollutants. Oxide materials obtained by electrodeposition contained ~ 4.5 % of bismuth and have the β–PbO2 lattice. The insertion of bismuth into the composition of lead dioxide prepared by electrodeposition resulted in an increase in their specific surface area from 0.66 to 2.5 m2 g−1. Modification of β–PbO2 by bismuth led to the shift of oxygen evolution potentials toward more positive values. Effective electrooxidation of non-ionic surfactants was achieved in the solutions exposed to electrochemical treatment. There were no accumulations of metabolites in the solutions during electrolysis. Chemical oxygen demand decreased from 80 to 5 mg O2 dm−3, and total organic carbon (TOC) decreased from 24 to 1.5 ppm during 1 h of the electrochemical treatment. The electrode material was stable under electrolysis conditions. No accumulation of both lead and bismuth species in the solution under electrochemical treatment was found.



中文翻译:

铋改性的二氧化铅阳极上非离子表面活性剂的有效电化学破坏,用于废水预处理

非离子表面活性剂是各种来源的废水中的永久性成分,必须去除它们才能进行污水处理。提出了一种电化学处理废水以去除非离子表面活性剂的新方法。两个烷氧基化和phenoxylated非离子表面活性剂的有效破坏,使用β -铅执行-1- X的Bi X ø 2-0.5 X阳极通过电沉积来制备。建议的方法基于活性含氧物质(例如OH ,HO 2 ),然后在这些自由基与有机分子之间发生化学相互作用,从而导致污染物的破坏。通过电沉积得到的氧化物材料含有铋的〜4.5%,并具有β-PBO 2晶格中。将铋插入通过电沉积制备的二氧化铅组合物中导致其比表面积从0.66增加到2.5 m 2  g -1。β–PbO 2的修饰铋引起的析氧势向更正值的转移。在暴露于电化学处理的溶液中实现了非离子表面活性剂的有效电氧化。在电解过程中,溶液中没有代谢产物的积累。在电化学处理的1小时内,化学需氧量从80 mg O 2  dm -3降低至5 mg O 2 dm -3,总有机碳(TOC)从24 ppm降低至1.5 ppm。电极材料在电解条件下是稳定的。在电化学处理下,没有发现铅和铋物质在溶液中积累。

更新日期:2020-01-02
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