光电催化降解化学镀铜废水中的EDTA

Degrade the EDTA in the waste of PTH by Photoelectron catalysis

PCB制造过程中的化学镀铜废水,由于络合剂EDTA(乙二胺四乙酸二钠)的存在,影响着末端处理使用化学沉淀方法的处理效果。本文采用溶胶-凝胶法,以泡沫镍片为载体,制得负载型纳米TiO_2催化剂。以制备的负载型催化剂为工作电极,以波长为275.3 nm的紫外灯为光源,选择降解物为PCB化学镀铜废水中的EDTA。用自制的光电催化降解反应装置,对光电催化降解PCB化学镀铜废水中的EDTA进行研究;用消解法测定目标物EDTA降解过程的COD变化以计算其降解效率;探讨影响含EDTA废水降解效率的一些因素:如外加电压、溶液PH值、温度等。结果表明,用负载型纳米TiO_2催化剂对化学镀铜废水中的EDTA进行光电催化降解有一定的效果。

Because of the EDTA complex agent in the waste of electrolese copper plating of the PCB manufacturing,it influences the efficiency of the chemical precipitation process.This paper introduces the preparation of nanosized TiO2 on supported activated carbon,an effective PHotocatalyst,using the foamed nickel as raw material by sol-gel method.It degrades the EDTA in the waste of the electrolese copper plating with using the working electrode as the PHotocatayst and UV lamp（λ=275.3nm）.Studying the process of the degradation of EDTA and calculating the COD of the EDTA and the efficiency with digestion method,at the same time discussing other factors：impressed voltage,PH,temperature and so on.It reveals that the effect of the degradation for the EDTA of electrolese copper plating is excellent.