Bi_2WO_6催化剂的合成及光催化性能的研究  

Study on the preparation and photocatalytic activity of Bi_2WO_6 photocatalyst

作　　者：郭丹[1] 赵彬侠[1] 高美莉 刘雪松[1] 陈蓉[1] 王蒙[1] 

机构地区：[1]西北大学化工学院,西安710069

出　　处：《功能材料》2015年第3期3055-3059,共5页Journal of Functional Materials

基　　金：陕西省科技厅社发攻关资助项目(2013K13-0104);榆林市产学研合作资助项目(2012yk-01-06)

摘　　要：以Bi(NO3)3·5H2O和Na2WO4·2H2O为原料,采用水热法制备Bi2WO6催化剂,在λ>420nm的可见光区降解模拟罗丹明B(RhB)废水,研究前驱物pH值、水热反应温度和时间对Bi2WO6催化性能的影响;通过X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见吸收光谱(UV-Vis)和比表面积(BET)表征,考察前驱物pH值对催化剂晶型、形貌、吸光性和比表面积的影响。结果表明,前驱物pH值为Bi2WO6光催化活性的关键影响因素,且对产物微观结构影响较大。当pH值=4.5时合成的产物光催化活性最佳,反应90 min RhB溶液降解率达到99.90%,经重复使用4次,其光催化效果无明显降低,表明该Bi2WO6是一种有效稳定的可见光催化剂。Bi2WO6 was synthesized by hydrothermal method using Bi(NO3)3??5H2O and Na2WO4??2H2O as raw materials.The photocatalytic activity of prepared materials was tested by the degradation of Rhodamine B (RhB)solution under visible-light irradiation (λ>420 nm).The effects of pH value of precursor suspensions, reaction temperature and time on the catalytic behavior were investigated.Samples prepared by precursor sus-pension with different pH were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),UV-visible diffuse-reflection spectroscopy (UV-Vis)and brunauer-emmet-teller method (BET).The results indicated that pH value of precursor suspension was the crucial factor to the photocatalytic activity of Bi2 WO6 ,and had a strong influence on its microstructure.The sample prepared by precursor suspension with pH=4.5 obtained the optimal photocatalytic activity (the degradation of RhB was up to 99.90% under 90 min irradiation).In addition,the catalytic activity of the catalyst remained constant after 4 runs of the experiment, demonstrating that Bi2 WO6 was an efficient and stable visible-light photocatalyst.

关 键 词：Bi2WO6 前驱物pH值 光催化性能 

分 类 号：O643[理学—物理化学] O644[理学—化学]