Photo-catalytic degradation of methyl orange and formaldehyde by Ag/InVO4–TiO2 thin films under visible-light irradiation
Photo-catalytic degradation of methyl orange and formaldehyde by Ag/InVO4–TiO2 thin films under visible-light irradiation
复制标题
DOI：
10.1016/j.molcata.2006.05.026
复制
发表时间：
2006-10
影响因子：
--
通讯作者：
L. Ge;Ming-xia Xu;Haibo Fang
中科院分区：
文献类型：
--
作者：
L. Ge;Ming-xia Xu;Haibo Fang
采用溶胶-凝胶法合成了新型Ag/ invo4 - tio2复合薄膜，以阐明其可见光驱动光催化性能。采用x射线衍射（XRD）、场发射扫描电镜（FE-SEM）、x射线光电子能谱（XPS）、紫外-可见吸收光谱（UV-vis）和电子自旋共振（ESR）等技术对制备的复合薄膜进行了表征。结果表明，Ag/ invo4 - tio2薄膜的光吸收光谱向可见光区扩展。研究了在Ag和invo4共掺杂tio2薄膜上可见光诱导光催化降解水中甲基橙（MO）和气态甲醛。在甲醛和甲基橙的产物中分别检测到co2和SO42−，表明在可见光下，甲醛和甲基橙在Ag/ invo4 - tio2薄膜上矿化。本文还讨论了贵金属Ag作为电子陷阱和invo4作为窄带隙敏化剂在Ag/ invo4 - tio2薄膜中的作用。本研究为利用可见光处理有机污染物提供了一种途径。
Novel Ag/InVO4–TiO2composite thin films were synthesized via a sol–gel method in order to elucidate their visible-light-driven photo-catalytic performance. A wide range of techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photo-electron spectroscopy (XPS), UV–vis absorption spectroscopy (UV–vis) and electron spin resonance (ESR) were applied to characterize the obtained composite thin films. The results revealed that the Ag/InVO4–TiO2thin films extended the light absorption spectrum toward the visible region. Visible-light-induced photo-catalytic degradation of aqueous methyl orange (MO) and gaseous formaldehyde over Ag and InVO4co-doped TiO2thin films was observed. CO2and SO42−were detected in the products of formaldehyde and methyl orange, respectively, indicating that formaldehyde and methyl orange were mineralized over the Ag/InVO4–TiO2films under visible light. The effects of doped noble metal Ag by acting as electron traps and InVO4as a narrow band gap sensitizer in the Ag/InVO4–TiO2films were also discussed. This study may provide an approach to treatment of organic pollutants by using visible light.