TiO_2与Cu_2O光催化降解对硝基苯酚比较研究  

COMPARISON STUDY ON PHOTOCATALYTIC DEGRADATION OF p-NITROPHENOL ASSISTED BY TITANIUM DIOXIDE AND CUPROUS OXIDE

作　　者：孟楠[1] 张爱茜[1] 吴海锁[2] 黄智[1] 王连生[1] 

机构地区：[1]南京大学环境学院 [2]江苏省环境科学研究院,南京210008

出　　处：《环境化学》2005年第6期659-661,共3页Environmental Chemistry

基　　金：国家自然科学基金(20477017);863项目(2002AA649130);江苏环境工程重点实验室开放课题资助.

摘　　要：分别采用自制的纳米TiO2和Cu2O研究对硝基苯酚的光催化降解.结果表明,模拟阳光条件下,100mg·l-1对硝基苯酚水溶液的氧化亚铜催化反应半衰期为20.0min,而二氧化钛不具备可见光催化能力;在SGY-1多功能光化学反应器中,TiO2催化降解对硝基苯酚的半衰期是48.1min.产物分析表明,n-型半导体二氧化钛的光催化反应存在两种降解历程,生成二羟基硝基苯或脱除硝基.而p-型半导体氧化亚铜催化的光降解反应未检出脱硝基产物,仅检出1,2-二羟基-4-硝基苯.Fine particles of cuprous oxide （Cu2 O） catalysts in the heterogeneous photocatalytic and titanium dioxide （TiO2） were prepared and applied as photodegradation of p-nitrophenol. Under the irradiation of artificial solar devices, the degradation halflives of p-nitrophenol solutions of 100mg · l^-1 proved to be 20.0min for Cu2O, while TiO2 showed no photocatalysis activity under visible light irradiation. Moreover, the GC-MS analysis identified p-benzoquinone, hydroquinone and 4-nitrocatechol as major intermediates of TiO2-catalysis reaction, which indicating the existence of two degradation pathways, formation of dihydroxynitrobenzene and removal of nitro-group. In the contrast, only 4-nitrocatechol was detected in the solution of Cu2 O-catalysis reaction in the experimental condition.

关 键 词：光催化降解 二氧化钛 氧化亚铜 对硝基苯酚. 

分 类 号：X132[环境科学与工程—环境科学]