溶剂对BiOBr结构和光催化降解RhB的影响

以水热法合成了不同形貌的BiOBr样品.采用X射线衍射(XRD)、扫描电子显微镜(SEM)、氮气吸附脱附曲线和紫外可见漫反射光谱(UV-Vis DRS)研究溶剂对BiOBr样品的晶形、形貌、孔径分布和比表面积、光学性质的影响;以罗丹明B(RhB)为目标降解物,研究溶剂对BiOBr的可见光催化性能的影响.实验结果表明,采用EG为溶剂的BiOBr在可见光降解RhB中表现出最佳的降解效果,因其较采用HNO_3、GL和PVP为溶剂的样品具有更高I_((001))/I_((102)),更小的禁带宽度和更均一的纳米片形貌.此外,阐述了溶剂对光催化降解RhB的影响机理.

Effect of Solvents on structural performance and photocatalytic degradation of RhB over BiOBr samples

The BiOBr samples with various morphologies were prepared by hydrothermal method.The influences of solvents on their crystalline phase,morphology,pore distribution and BET,and optical property were studied by XRD,SEM,N2 adsorption-desorption and DRS.And the influences of solvents on photocatalytic efficiency were measured by RhB photo-degradation under visible-light irradiation.It was found that the BiOBr samples prepared with EG showed higher RhB photo-degradation activity than the samples prepared with HNO3 ,GL and PVP,which was mainly attributed to its higher ratio of I(001)/I(102),less bandgap and more uniform nanosheet morphology.Mo-reover,the mechanism of effect of solvents on RhB degradation was discussed in this paper.