Zhang Xiufang, Zhang Yaobin, Quan Xie, Chen Shuo
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, China.
J Hazard Mater. 2009 Aug 15;167(1-3):911-4. doi: 10.1016/j.jhazmat.2009.01.074. Epub 2009 Jan 30.
Ag particles were doped on BiVO(4) film by photoreduction technique. XRD analysis indicated that the chemical state of the Ag particles was metallic Ag. TEM observation confirmed that the sizes of the Ag particles were 10-20nm. The investigation of the phenol degradation demonstrated that the photocatalytic (PC) degradation rate of the phenol on the Ag doped BiVO(4) film was enhanced by 1.61 times in PC process and by 42.7 times in photoelectrocatalytic (PEC) process compared with that of the BiVO(4) film. The transportation of the electrons from the BiVO(4) to Ag driven by the schottky barrier formed between Ag and BiVO(4) can increase the charge carrier separation, and consequently enhance the PC performance. The enhancement of the PC ability in PEC process could be attributed to the simultaneous movements of the photogenerated electrons to external circuit and the photogenerated holes to the Ag particles deposited on the BiVO(4) film. In 4h, the elimination efficiency and the TOC removal efficiency of phenol on the Ag doped BiVO(4) film in PEC process were 94.1% and 61.0%, respectively.
通过光还原技术将银颗粒掺杂在钒酸铋（BiVO₄）薄膜上。X射线衍射（XRD）分析表明，银颗粒的化学状态为金属银。透射电子显微镜（TEM）观察证实，银颗粒的尺寸为10 - 20纳米。苯酚降解研究表明，与钒酸铋薄膜相比，在光催化（PC）过程中，银掺杂钒酸铋薄膜上苯酚的光催化降解速率提高了1.61倍，在光电催化（PEC）过程中提高了42.7倍。由银与钒酸铋之间形成的肖特基势垒驱动的电子从钒酸铋向银的传输可以增加电荷载流子的分离，从而提高光催化性能。光电催化过程中光催化能力的增强可归因于光生电子向外部电路的同时移动以及光生空穴向沉积在钒酸铋薄膜上的银颗粒的移动。在4小时内，光电催化过程中银掺杂钒酸铋薄膜上苯酚的去除效率和总有机碳（TOC）去除效率分别为94.1%和61.0%。
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