Preparation of Ag doped BiVO4 film and its enhanced photoelectrocatalytic (PEC) ability of phenol degradation under visible light.
Preparation of Ag doped BiVO4 film and its enhanced photoelectrocatalytic (PEC) ability of phenol degradation under visible light.
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DOI：
10.1016/j.jhazmat.2009.01.074
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发表时间：
2009-08
影响因子：
13.6
通讯作者：
Xiufang Zhang;Yaobin Zhang;X. Quan;Shuo Chen
中科院分区：
文献类型：
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作者：
Xiufang Zhang;Yaobin Zhang;X. Quan;Shuo Chen
采用光还原技术在bivo4薄膜上掺杂银粒子。XRD分析表明，银颗粒的化学态为金属银。透射电镜观察证实，银颗粒尺寸在10 ~ 20nm之间。对苯酚的降解研究表明，与掺杂银的bivo4膜相比，光催化（PC）法和光电催化（PEC）法对苯酚的降解率分别提高了1.61倍和42.7倍。在Ag和bivo4之间形成的肖特基势垒驱动下，电子从bivo4向Ag输运，增加了载流子的分离，从而提高了PC的性能。PEC过程中PC能力的增强可以归因于光生电子同时向外电路移动，光生空穴同时向沉积在bivo4薄膜上的Ag粒子移动。在4h的PEC过程中，掺银bivo4膜对苯酚的去除率和TOC去除率分别为94.1%和61.0%。
Ag particles were doped on BiVO4film 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 BiVO4film was enhanced by 1.61 times in PC process and by 42.7 times in photoelectrocatalytic (PEC) process compared with that of the BiVO4film. The transportation of the electrons from the BiVO4to Ag driven by the schottky barrier formed between Ag and BiVO4can 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 BiVO4film. In 4h, the elimination efficiency and the TOC removal efficiency of phenol on the Ag doped BiVO4film in PEC process were 94.1% and 61.0%, respectively.