Sb_2O_3/BiOBr复合物的制备及其对RhB的去污作用

Preparation of novel Sb_2O_3/BiOBr composite and decontamination of RhB

为了进一步提高BiOBr在可见光范围内的光催化性能,通过简单的低温液相法制备了不同质量掺杂比的三氧化二锑/溴氧化铋(Sb_2O_3/BiOBr)复合光催化材料。利用X射线衍射仪(XRD)、扫描电镜形貌分析(SEM)、X射线光电子能谱(XPS)、紫外-可见光漫反射(UV-Vis/DRS)、透射电子显微镜(TEM)等对材料进行了表征,并以罗丹明B(RhB)为目标污染物,在模拟可见光条件下研究了复合物对RhB的光催化降解性能。结果表明,Sb_2O_3的掺杂显著提高了复合物的吸附能力;同时,Sb_2O_3的掺杂促进了BiOBr表面羟基(OH^-)的产生,该基团能够有效捕获空穴(h^+),从而提高光催化活性。当Sb_2O_3掺杂量为3%(质量分数)时降解效果最佳,60min内Rh B的降解率比纯相BiOBr提高了20.03%,达到了95.41%。多次重复实验,复合物的光催化性能并没有发生明显的减弱,表明复合物同时也具有较好的稳定性。

Different doping mass ratio of Sb203/BiOBr composite photocatalytic material were synthesized via a facile low-temperature liquid-phase method to further enhance visible-light photocatalytic activity. The microstructure and properties of Sb203/BiOBr composites were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, UV-Vis/DRS spectrophotometer techniques, transmission electron microscope （TEM） The photocatalytic activities of Sb203/BiOBr nanoparticles were evaluated by the degradation of Rhodamine B （RhB）. Doping of Sb203 significantly improve the adsorption capacity of the composite. At the same time, the generation of the BiOBr surface hydroxyl groups, which could availably capture the photon-generated hole, thus improving the photocatalytic activity of TiO2. The 3% doping mass ratio Sb203/BiOBr composite photocatalyst was found to have the highest photocatalytic activity, and was 20.03% higher than the pure BiOBr under visible light irradiation in 60min, reached 95.41%. After several cycles, the composite showed no apparent decrease in activity, whichshows the composite also have good stability.