作　　者： ; ; ; ; ; ;

机构地区： 广西师范大学环境与资源学院

出　　处： 《纳米科技》 2013年第3期42-46,共5页

摘　　要： 以XBiCl3和AgNO3为原料，采用水解法成功地制备了BiOCl／AgCl复合催化剂，利用XRD、SEM、uV～VisDRS对样品进行了表征，以RhB为目标污染物，研究了不同初始nBi^3＋／nAg＋比、光源对光催化性能的影响，并探讨了样品的重复使用效率及光催化降解RhB的动力学行为，结果表明，初＋=anBi2＋／nAg＋比为100：1合成的样品具有最佳的光催化性能，在太阳光下仅照射15min其pH=6．5的20mg／LRhB溶液的脱色率即可达98．81％，而在卤素灯和紫外灯照射30min条件下，其脱色率分别为95．89％和11．63％。样品重复使用19次后，溶液脱色率仍高达95％，具有较好的稳定性。动力学研究表明，RhB光催化降解属表观一级动力学，反应符合Langmuir—Hinshelwood动力学方程，速控步为吸附反应。 Using BiCl3 and AgNO3 as the main raw material, a novel high efficient multiphase catalysts BiOCl/AgCl re- sponse to visible light were successfully synthesized by simple hydrolyze method. The as-prepared samples were charac- terized by XRD, SEM and UV-Vis DRS. The effects of different initial nBi3＋/nAg＋, light source on photocatalytic efficien- cy were studied by use of RhB as a target pollutant. Reuse efficiency of the as-prepared samples and kineitc behavior of photocatalytic degradation RhB were investigated. The results showed that the samples prepared at the initial nBi3＋/nAg＋ of 100：1 show the best photocatalytic property, The decolorization efficiency of RhB is up to 98.81% under the conditions of pH=6.5, RhB of 20mg/L and sunlight irradiation for 15 minutes, while using 250W halogen lamp and 12W ultraviolet lamp as light source for 30 minutes, the decolorization rates were 95.89% and 11.63%, respectively. The samples were used 19ths, the deeolorization rate was still up to 95%, showing a high stability. Kinetic research showed that the photo- catalytic degradation reaction of RhB can be well expressed by an appearance first order equation and consist with the Langmuir-Hinshelwood kinetic equation, the overall reaction rate was assumed to be controlled by the adsorption step.

关 键 词： 可见光响应 水解法 降解动力学

领　　域： [化学工程]