State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China.
J Hazard Mater. 2010 Jan 15;173(1-3):194-9. doi: 10.1016/j.jhazmat.2009.08.068. Epub 2009 Aug 22.
A highly efficient monoclinic BiVO(4) photocatalyst (C-BVO) was synthesized by an aqueous method with the assistance of cetyltrimethylammonium bromide (CTAB). The structure, morphology and photophysical properties of the C-BVO were characterized by XRD, FE-SEM and diffuse reflectance spectroscopy, respectively. The photocatalytic efficiencies were evaluated by the degradation of rhodamine B (RhB) under visible-light irradiation, revealing that the degradation rate over the C-BVO was much higher than that over the reference BiVO(4) prepared by aqueous method and over the one prepared by solid-state reaction. The efficiency of de-ethylation and that of the cleavage of conjugated chromophore structure were investigated, respectively. The chemical oxygen demand (COD) values of the RhB were measured after the photocatalytic degradation over the C-BVO and demonstrated a 53% decrease in COD. The effects of CTAB on the synthesis of C-BVO were investigated, which revealed that CTAB not only changed the reaction process via the formation of BiOBr as an intermediate, but also facilitated the transition from BiOBr to BiVO(4). Comparison experiments were carried out and showed that the existence of impurity level makes significant contribution to the high photocatalytic efficiency of the C-BVO.
一种高效的单斜相 BiVO(4) 光催化剂（C-BVO）通过水相法在十六烷基三甲基溴化铵（CTAB）的辅助下合成。通过 XRD、FE-SEM 和漫反射光谱分别对 C-BVO 的结构、形貌和光物理性质进行了表征。通过在可见光照射下降解罗丹明 B（RhB）来评估光催化效率，结果表明 C-BVO 的降解速率远高于水相法制备的参考 BiVO(4)和固相反应法制备的 BiVO(4)。分别考察了 C-BVO 的脱乙基效率和共轭生色团结构的断裂效率。在 C-BVO 光催化降解后测量 RhB 的化学需氧量（COD）值，表明 COD 降低了 53%。考察了 CTAB 对 C-BVO 合成的影响，结果表明 CTAB 不仅通过形成 BiOBr 作为中间体改变了反应过程，而且还促进了 BiOBr 向 BiVO(4)的转变。进行了对比实验，结果表明杂质能级的存在对 C-BVO 的高光催化效率有重要贡献。
