Enhancement of the photocatalytic performance of Ag-modified TiO₂ photocatalyst under visible light

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• 作者：Cheewita Suwanchawalit^a ; ^{cheewita@su.ac.th} ; ^{cheewita_31@hotmail.com} ; Sumpun Wongnawa^b ; Pimpaporn Sriprang^b ; Pachara Meanha^a
• 关键词：A. Sol&ndash ; gel process ; Titanium dioxide ; Mesoporous titanium dioxide ; Ag-modified TiO2 ; Indigo camine ; Dye decolorization
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：5201-5207
• 文件大小：1028 K

摘要

A highly visible-light photocatalytic active Ag-modified TiO₂ (Ag-TiO₂) was prepared by a simple sol-gel process using TiOSO₄ as the starting material, AgNO₃ as a silver doping source, and hydrazine as a reducing agent. The prepared Ag-TiO₂ samples were characterized by several techniques such as X-ray powder diffraction (XRD), BET surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), energy dispersive X-ray spectrometry (EDX), X-ray absorption spectroscopy (XAS) and UV-vis diffuse reflectance spectroscopy (DRS). The Ag-TiO₂ photocatalyst, a mixture of amorphous and anatase phases, has a high surface area. The silver contents in the Ag-TiO₂ samples were determined by ICP measurements. The diffused reflectance UV-vis spectra indicated that the Ag-TiO₂ samples exhibited higher red shifts compared with the undoped TiO₂ sample. Indigo carmine degradation under visible irradiation indicated that the Ag-TiO₂ catalyst gave higher photocatalytic efficiency than those of commercial P25-TiO₂ and undoped-TiO₂ samples. The Ag-TiO₂ catalyst can be reused many times without any additional treatment.