Preparation, Modification And Photocatalytic Activity Of BiOX (X=Cl, Br And I) Photocatalysts

In this paper, bismuth oxyhalide semiconductor materials were prepared viaultrasound method, hydrothermal method, and solvent-thermal method. The as-preparedbismuth oxyhalide samples were deposited by noble metals and composited by Ag3PO4semiconductor. Furthermore, the corresponding characterization and the photocatalyticproperties of the samples were investigated. The main details could be divided into threeparts as followings:1.Bismuth oxyhalide semiconductor materials were successfully prepared byultrasound method, hydrothermal method, and solvent-thermal method usingBi(NO3)3·5H2O and KX as raw materials. Their UV-Vis light absorptions properties wereinvestigated. Their abilities of degradation organic contaminants，such as methyl orange(MO), Methylene blue(MB), Rhodamine B were determined.2. Using a simple photo-reduction method, the noble metals of silver particle weredeposited and dispersed the surface of as-prepared BiOX. We obtained the Ag/BiOXphotocatalysts. Further, their photocatalytic properties were also investigated, andcompared with pure BiOX.3. BiOBr, BiOI and Ag3PO4responsed under visible light. Ag3PO4has an advantagein degradation efficiency of BiOBr and BiOI. However, Ag3PO4is unstable. A lightcorrosion will be emerged during the process of degradation. What’s more, the catalysiswill be easy outflow. By composition, heterojunction structure of Ag3PO4/BiOBr andAg3PO4/BiOI were prepared. This composite not only improved the stability of Ag3PO4obviously, but also enhanced the catalytic activities to a certain extent. Base on above, weinvestigated the recycling using of catalysis. Meanwhile, the main activities species werealso confirmed in the process of photo-degradation.