摘要
利用微波光催化实验装置研究了水溶液中兽药环丙氨嗪的光催化降解,探讨了添加微波无电极灯(EDL)对降解反应的促进作用.结果表明,环丙氨嗪在微波辅助1.0g/L TiO2光催化体系中反应20min降解率可达99.6%,检测到的主要降解产物为三聚氰胺.环丙氨嗪在pH3.0～9.0范围内的微波辅助光催化降解率都高于99%;增加TiO2用量和EDL数量均显著提高其降解率.外源添加NO3-离子明显降低了环丙氨嗪的降解率,主要由于NO3-对紫外光的强吸收和在TiO2表面带正电的空穴位的吸附作用.
Photocatalytic degradation of cyromazine in TiO2 aqueous suspensions assisted with microwave was investigated with a microwave apparatus.The enhancement of the degradation by electrodeless discharge lamp（EDL） was examined.Results showed that the degradation efficiency of cyromazine in 1.0 g/L TiO2 suspension reached 99.6% after 20 min reaction by the microwave assisted photocatalysis.The primary degradation product melamine was detected.The degradation efficiencies of cyromazine were all over 99% in the pH range from 3.0 to 9.0 and increased with the increasing dosage of TiO2 and the number of EDL.Addition of nitrate ions considerably inhibited the degradation of cyromazine,which was mainly caused by the high UV absorption of nitrate at the short wavelength and the adsorption of nitrate in positive holes on TiO2 surface.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2012年第4期603-608,共6页
China Environmental Science
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-Q10-3)
关键词
微波辅助
光催化
降解
环丙氨嗪
microwave assistance
photocatalysis
degradation
cyromazine
