| Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension |
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| 作者姓名： | 阎建辉 黄可龙 刘素琴 曾恒志 |
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| 作者单位： | [1]SchoolofChemistryandChemicalEngineering,CentralSouthUniversity,Changsha410083,China [2]DepartmentofChemistryandChemicalEngineering,HunanInstituteofScienceandTechnology,Yueyang414000,China [3]SchoolofChemistryandChemicalEngineering,CentralSouthUniversity,Changsha410083,China／／DepartmentofChemistryandChemicalEngineering,HunanInstituteofScienceandTechnology,Yueyang414000,China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 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.
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| 关 键 词： | 光催化降解 纳米材料 二氧化钛 银沉积 废水治理 |
Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension |
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| YAN Jian-hui,HUANG Ke-long,LIU Su-Qin,ZENG Heng-zhi.Photocatalytic degradation of dimethomorph on nanometer titanium dioxide by silver depositing in aqueous suspension[J].Transactions of Nonferrous Metals Society of China,2005,15(3):680-685. |
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| Authors: | YAN Jian-hui HUANG Ke-long LIU Su-Qin ZENG Heng-zhi |
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| 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 1.25 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. |
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| Keywords: | dimethomorph photocatalytic degradation nanometer TiO2 silver deposition |
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