Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension  

作　　者：阎建辉 黄可龙 刘素琴 曾恒志 

机构地区：[1]School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China [2]Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China

出　　处：《中国有色金属学会会刊：英文版》2005年第3期680-685,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2001AA2180041)supportedbyHitechResearchandDevelopmentProgramofChina

摘　　要：A series of catalysts of nanometer TiO2 were prepared by silver depositing. The photocatalytic degradation of dimethomorph in an aqueous suspensions by silver depositing with nanometer titanium dioxide as catalyst was investigated by radiation of UV-light and sunlight. A pseudo-first-order kinetic model was used to describe the results. The effects of the dosage of catalyst, oxidant, pH and radiation source on degradation were examined. The experimental results show that the decomposed rate of DMM is 94% when the dosage of catalyst is 1.25g/L and the concentration of DMM is 100mg/L under the conditions of solution pH of 7, the air flow of 1.5L/min and shining for 5h by UV-light. When it is shined by sun-light under the same condition, the decomposed rate of DMM is 48%. The mechanism of decomposition was discussed based on the data by analysis of LC-MS.A series of catalysts of nanometer TiO_2 were prepared by silver depositing. The photocatalytic degradation of dimethomorph in an aqueous suspensions by silver depositing with nanometer titanium dioxide as ~catalyst was investigated by radiation of UV-light and sunlight. A pseudo-first-order kinetic model was used to ~describe the results. The effects of the dosage of catalyst, oxidant, pH and radiation source on degradation were ~examined. The experimental results show that the decomposed rate of DMM is 94% when the dosage of catalyst is ~1.25g/L and the concentration of DMM is ~100mg/L under the conditions of solution pH of 7, the air flow of ~1.5L/min and shining for 5h by UV-light. When it is shined by sun-light under the same condition, the decomposed rate of DMM is 48%. The mechanism of decomposition was discussed based on the data by ~analysis of LC-MS.

关 键 词：光催化降解 纳米材料 二氧化钛 银沉积 废水治理 

分 类 号：X52[环境科学与工程—环境工程]