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Citation: YAN Jian-Hui, HUANG Ke-Long, LIU Su-Qin, ZHANG Qiao-Yun. Preparation and Photocatalytic Activity of Silver Deposited Nano TiO₂[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 132-137. shu

Preparation and Photocatalytic Activity of Silver Deposited Nano TiO₂

1.
a Institute of Functional Materials and Chemistry, Central South University, Changsha 410083;
2.
b Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang

Corresponding author: HUANG Ke-Long,
Received Date: 29 April 2004
Available Online: 16 July 2004
Fund Project: 国家"八六三"计划资助项目(2001AA2180041) (2001AA2180041)

Ag was deposited by H₂ reduction on the surface of TiO₂ nanoparticles. The results of SEM, XRD and UV-vis show that Ag distributes uniformly on the TiO₂ surface and the Einstein shift can be observed clearly in the UV-vis adsorption spectrum. UV and sunlight were used as light sources to investigate the photocatalytic activity of the Ag/TiO₂ composite catalyst for the degradation of methyl orange. The results show that the optimized amount of deposited Ag is 0.25%(molar ratio of Ag to TiO₂) and the calcination temperature influences slightly the photocatalytic activity when it is lower than 300℃. For the UV light degradation reation, the optimum photocatalyst concentration was determined to be 1.25 g/L. Both weakly acidic condition and the presence of peroxide are of great advantage to the light degradation reaction. The photocatalytic activity increases with the decrease of the total volume of the solution or the increase of the illumination intensity in unit volume. The degradation of methyl orange follows first-order reaction kinetics for different catalysts. Compared with pure TiO₂, Ag/TiO₂ shows higher photocatalytic activity when it is used to degrade methyl orange under sunlight.
- nano TiO₂,
- silver deposition,
- photocatalysis,
- methyl orange
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Preparation and Photocatalytic Activity of Silver Deposited Nano TiO2

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通讯作者: 陈斌, bchen63@163.com

Preparation and Photocatalytic Activity of Silver Deposited Nano TiO₂