掺硼金刚石膜电极除菌除农药性能及机理探讨

Performance and Mechanism of Boron-doped Diamond Film Electrode for Bacterial and Pesticide Removal

针对家庭中果蔬残留的农药和细菌问题,采用掺硼金刚石(BDD)膜电极降解目标污染物敌草隆、异丙威,并对金黄色葡萄球菌的去除效果进行探索。结果表明:BDD膜电极能有效去除水中的敌草隆、异丙威和金黄色葡萄球菌,降解(或灭活)率分别为99%、87%和99.9%。水中的电解质(氯离子、硫酸根、碳酸氢根)可以通过影响活性成分(臭氧、羟基自由基等)的产率,在不同程度上抑制污染物的降解。通过对降解产物进行分析,推测芳香环羟基化为目标污染物的主要降解路径,且敌草隆和异丙威的急性毒性在BDD体系降解过程中逐渐降低。适用于龙头末端的BDD膜电极装置可以有效保障用户的用水安全。

To solve the problem of residual pesticide and bacteria on fruits and vegetables in households,boron‑doped diamond(BDD)film electrode was used to degrade the target contaminants diuron and isoprocarb,and the removal performance of Staphylococcus aureus was explored.The BDD film electrode was capable of effectively removing diuron,isoprocarb and Staphylococcus aureus from water,and its degradation(or inactivation)rates were 99%,87%and 99.9%,respectively.The electrolytes in water(chloride ions,sulfate and bicarbonate)inhibited the degradation of pollutants to varying degrees by affecting the yield of active ingredients(ozone,hydroxyl radicals,etc.).Based on the analysis of degradation products,it was speculated that the hydroxylation of aromatic ring was the main degradation pathway of the target pollutants,and the acute toxicity of diuron and isoprocarb gradually decreased during the degradation process of the BDD film system.The BDD film electrode device applicable to the end of faucet effectively ensured the drinking water safety for users.