BiOBr/CdS复合微球的制备及其光催化性能研究

The Synthesis,Characterization and Photocatalytic Activities Investigation of BiOBr/CdS Microsphere

以Bi(NO_3)_3、KBr、Na_2S和Cd(NO_3)_2等为原料,依次采用溶剂热法和多次浸渍法,制备了具有可见光活性的BiOBr/CdS复合微球催化剂,并通过X射线衍射仪(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)等表征手段对合成的催化剂进行表征,并以罗丹明B作为目标污染物,在可见光的照射下,考察了复合材料的有机污染物降解能力。结果表明,在光照时间为120min时,罗丹明B染料的降解率可达85%,相对于纯的CdS和BiOBr而言,所制备的BiOBr/CdS异质结催化剂具有良好的光催化活性和良好的可见光响应能力。主要原因可归因于异质结结构能很好地促进光生载流子的分离和迁移。

Using Bi （ NO3 ） 3 kBr, Na2 S and Cd （ NO3 ） 2 as raw materials, the BiOBr/CdS composite catalysts with visible light activity were prepared by the sequential solvothermal and repeated impregnation method. The samples were characterized by X- ray diffraction （ XRD ） , scanning electron microscope （ SEM ）, transmission electron microscopy （TEM）. And with Rhodamine B fuel as the target of pollu- tants, the visible light degradation ability of synthetic material was examined. It was found that 85% of rhodamine B degradedafterl20 rain＇s illumination. Compared with pure CdS and BiOBr, the heterojunction of BiOBr/CdS showed superior photocatalytic activity, which could be attributed to the ability of heterojunc- tion to promote charge separation and transport.