微波诱导催化降解水中孔雀石绿研究  

Microwave induced catalytic degradation of malachite green in water

作　　者：杨绍贵[1] 孟令君[1] 李东方[1] 何欢[1] 孙成[1] Yang Shaogui Meng Lingjun Li Dongfang He Huan Sun Cheng(State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanj ing University, Nanjing, 210023, China)

机构地区：[1]污染控制与资源化研究国家重点实验室南京大学环境学院,南京210023

出　　处：《南京大学学报（自然科学版）》2017年第2期292-300,共9页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(51278242);江苏省产学研前瞻性联合研究项目(BY2016116)

摘　　要：以纳米级铁酸锌(ZnFe_2O_4)粉体为微波诱导催化剂,构建了微波-ZnFe_2O_4催化反应体系.微波-ZnFe_2O_4反应体系下孔雀石绿(MG)的降解结果表明:20mg·L^(-1)的目标化合物在2 min内基本上被完全去除.利用LC/MS与GC/MS鉴定了孔雀石绿的主要降解产物,并推断其降解途径:逐步脱甲基、共轭生色团的破坏、开环和矿化.对比研究了添加H_2O_2进入微波-ZnFe_2O_4催化反应体系前后降解产物的变化,结果表明:H_2O_2等的加入能大幅提高孔雀石绿降解效率,有助于共轭生色团的破坏,这归因于H_2O_2与催化剂之间发生了Fenton反应.研究为三苯甲烷染料类废水处理提供了新的有效方法.Microwave induced catalytic degradation of malachite green（MG）was investigated in this study,where Nano-sized zinc ferrite powder synthesized via coprecipitation process was used as a microwave induced catalyst.The phase structure and size of the catalyst were characterized by XRD and TEM.The results indicated that the catalyst was a pure ZnFe2O4 and its grain was spherical;and grain size rose with the calcination temperature.The degradation results showed that the target compounds of 20 mg·L-1 were completely removed in 2 minutes.Main intermediate products were identified by LC/MS and GC/MS.the possible degradation mechanisms contains four processes：N-demethylation,chromophore cleavage,ring opening and mineralization.Comparison on the differences of intermediates products before and after H2O2 addition,indicated its possible degradation mechanisms were different.Chromophore cleavage process played a more important role in the presence of H2O2.Microwave induced catalysis could be recommended as a promising method for wastewater treatment.

关 键 词：微波诱导催化 铁酸锌 孔雀石绿 降解机理 

分 类 号：X131[环境科学与工程—环境科学]