阴阳极成对耦合紫外光辅助电催化降解毒死蜱

Anode-cathode paired system of coupling UV-assisted electrocatalytic degradation of chlorpyrifos

以空气扩散阴极、纯铂阳极和紫外灯构建了阴阳极成对耦合紫外光辅助电催化的体系,并系统地研究了电流密度、阳极SO42-浓度以及毒死蜱初始浓度对毒死蜱降解效果的影响.结果表明,当阴极/阳极的电流密度为45/450 mA·cm^(-2),阳极SO42-浓度为1.0 mol·L^(-1),毒死蜱初始浓度为25 mg·L^(-1)时,反应60 min后毒死蜱降解率可达99%.对阴极产物的红外分析结果表明,毒死蜱降解后结构中的吡啶环和PS被破坏,产生亚硝氮和正磷酸盐,毒性得到减弱.通过对比阴阳极成对耦合紫外光复合体系与阴极耦合紫外光复合体系、阳极耦合紫外光复合体系的电流效率,发现阴阳极成对耦合紫外光复合体系的电流效率是阴极耦合紫外光复合体系的2倍,是阳极耦合紫外光复合体系的4倍.

In this work,the anode-cathode paired system of coupling UV-assisted electrocatalysis was constructed using air diffusion cathode,pure platinum anode and UV lamp.The effects of current density,anode SO42-concentration and initial concentration of chlorpyrifos on the degradation of chlorpyrifos were studied systematically.The results showed that when the current density of the cathode/anode was 45/450 mA·cm^(-2),the concentration of the anode SO42-was 1.0 mol·L^(-1),and the initial concentration of chlorpyrifos was 25 mg·L^(-1),the degradation ratio of chlorpyrifos could reach 99%after reacting 60 min.Furthermore,the infrared analysis of the cathode product was carried out and the results showed that the pyridine ring and PS double bond in the structure of chlorpyrifos were destroyed,nitrous oxide and orthophosphate were produced,and the toxicity was reduced.In addition,after comparing the current efficiency of the paired system with the unipolar system,it could be found that the current efficiency of anode-cathode paired system was 2 times that of the single cathode system,and it was 4 times that of the single anode system.