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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension
YAN Jian-hui(阎建辉)1, 2,  HUANG Ke-long(黄可龙)1
LIU Su-qin(刘素琴)1, ZENG Heng-zhi(曾恒志)2

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

Abstract: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 1.25g/L and the concentration of DMM is 100mg/L under the conditions of solution pH of 7, the air flow of  1.5L/min and shining for 5h 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.

 

Key words: dimethomorph; photocatalytic degradation; nanometer TiO2; silver deposition

ISSN 1672-7029
CN 43-1423/U

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