Ce^(3+)掺杂对溴氧化铋的改性研究

Study on Modification of Bismuth Bromide Photocatalyst by Ce^(3+) Doping

由于环境污染与科技发展相矛盾的问题日益突显,溴氧化铋(BiOBr)作为光催化剂的一种,以其高催化活性和绿色环保的特性表现出广泛的应用前景。以Bi(NO_(3))_(3)·5H_(2)O与NH_4Br为原料,不同温度下通过溶液燃烧法制备BiOBr粉体及加入Ce^(3+)掺杂改性,采用XRD、激光粒度仪、UV-Vis DRS、UV-Vis等对样品进行表征,以对次甲基蓝的去除效率研究光催化活性。结果表明:选择450℃制备BiOBr为最佳温度;当Ce^(3+)的掺入量为4%时,BiOBr的禁带宽度明显减小,在氙灯下对次甲基蓝的去除率达到99%。向BiOBr引入掺杂能级,可有效提高其光催化性能。

Because the contradiction between environmental pollution and technological development has become increas⁃ingly prominent,BiOBr as a kind of photocatalyst,shows a wide range of application prospects due to its high catalytic ac⁃tivity and environmental protection characteristics.This task uses Bi(NO_(3))_(3)·5H_(2)O and NH4Br as materials,prepares BiOBr powder by solution combustion method at different temperatures and adds Ce^(3+)doping modification,characterizing the sam⁃ples to analysis the photocatalytic activity of the removal efficiency of C16H18N3ClS by using XRD,laser size analysis,UVVis DRS,UV-Vis et al.The results show that the optimum temperature for preparing BiOBr is 450℃.When the doping amounts of Ce^(3+)is 4%,the band gap of BiOBr is importantly reduced,and the removal rate of C16H18N3ClS under xenon lamp is respectively reach 99%.Doping introduces doping energy levels into BiOBr,which can effectively improve its pho⁃tocatalytic performance.