采用聚乙烯吡咯烷酮(PVP)辅助溶剂热法合成了溴氧化铋(BiOBr)花状微球,并通过X射线衍射(XRD)、扫描电镜(SEM)和紫外可见漫反射光谱(UV-Vis DRS)等技术手段对样品进行了表征和分析,在汞灯辐照下以氯霉素(CAP)为降解底物,探讨了PVP添加量对BiOBr微球光催化性能的影响。结果表明:在表面活性剂PVP的辅助下,样品的尺寸变小,组成微球的纳米片变薄,比表面积增大,吸收带边发生红移,禁带宽度变小。当PVP添加量为0.4g时,制备BiOBr-0.4样品形貌为均匀的花状微球,直径约为2μm,禁带宽度为2.61eV,表现出最佳的光催化活性,对CAP的降解率达到74.5%,约为纯BiOBr的1.5倍。
The BiOBr flower-like microspheres were synthesized by in situ solvothermal method with the assistance of polyvinylpyrrolidone (PVP),and the as-prepared samples were characterized and analyzed by XRD,SEM,UV-Vis DRS techniques.Under the irradiation of mercury lamp,Chloramphenicol (CAP) was used as the substrate for degradation,and the effect of different PVP addition on the photocatalytic activity of BiOBr microspheres was discussed.The results shown that with the aid of the surfactant PVP,the sample size became smaller,the nanosheets that made up the microspheres became thinner,the specific surface area increased,the absorption band edge shifted red,and the forbidden band width became smaller.When the amount of PVP was 0.4g,the BiOBr-0.4 sample was prepared as uniform flower-shaped microspheres with a diameter of about 2μm,and a band gap of 2.61eV,showing the best photocatalytic activity,the degradation rate of CAP reached 74.5%,which was about 1.5 times that of pure BiOBr.
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基金资助
西安市碑林区应用技术研发项目(GX2004);大学生创新创业训练计划项目(S202010709043)
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