Enhancing the Photocatalytic Performance of Commercial TiO2 Crystals by Coupling with Trace Narrow-Band-Gap Ag2CO3

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• 作者：Changlin Yu ; Longfu Wei ; Jianchai Chen ; Yu Xie ; Wanqin Zhou ; Qizhe Fan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：5759-5766
• 全文大小：455K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

Trace Ag₂CO₃ (0.5%, 1%, 2%, and 4%) was loaded on commercial TiO₂ crystals by a facile precipitation method. The obtained Ag₂CO₃/TiO₂ composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), photolimunescence (PL) spectroscopy, and UV鈥搗is diffuse reflectance spectroscopy (DRS). Under UV light (位 = 254 nm) or visible light irradiation, the photocatalytic performance of the samples was tested in degradation of methyl orange (MO). Results showed that loading of 1 wt % Ag₂CO₃ results in the best photocatalytic activity. Under UV or visible light irradiation, the degradation activity of 1%Ag₂CO₃/TiO₂ composite is 6 times that of TiO₂ and 4 times that of Ag₂CO₃ or 3.4 times that of TiO₂ and 1.7 times that of Ag₂CO₃. Reasons for enhanced activity were found that the coupling of Ag₂CO₃ promoted the visible light absorption and suppressed the recombination rate of e^{鈥?/sup>/h+ pairs. Moreover, more surface OH groups over the Ag₂CO₃/TiO₂ composite can react with the photogenerated h+ and produce 鈥?/sup>OH radicals to decompose the dye.}