摘要
为了提高BiOBr的可见光光催化性能,利用微波法将不同物质的量比的TiO_(2)与BiOBr进行复合形成TiO_(2)-BiOBr,研究催化剂TiO_(2)-BiOBr对有机污染物罗丹明B降解效果的影响。采用扫描电子显微镜(SEM)、粉末X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外可见吸收光谱(UV-vis)等手段对所制备的催化剂进行表征。结果表明:相较于纯TiO_(2)和BiOBr,TiO_(2)-BiOBr在可见光区的光催化能力有了较大提高且可见光催化降解效率最高的物质的量比为n(TiO_(2))∶n(BiOBr)=1∶12。TiO_(2)-BiOBr复合催化剂光催化活性的提高是由于TiO_(2)粒子在BiOBr层状结构上附着并使结构向外生长,有利于具有光催化活性的BiOBr(110)晶面产生优势生长;TiO_(2)和BiOBr之间形成了独特的异质结构,两者都有效地提高了光生电子与空穴的分离效率。
In our present study,in order to improve the visible light photocatalytic performance of BiOBr,TiO_(2)-BiOBr was synthesized by microwave method with different molar ratio of TiO_(2) and BiOBr.The effect of TiO_(2)-BiOBr on the degradation of organic pollutant rhodamine B was then studied.The prepared catalysts were further characterized by scanning elec-tron microscopy(SEM),X-ray powder diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and UV-visible absorp-tion spectrum(UV-vis).The results showed that compared with pure TiO_(2) and BiOBr,the photocatalytic ability of TiO_(2)-BiOBr in the visible light region was greatly improved,and the quantity ratio of substances with the highest visible photocatalytic degradation efficiency was n(TiO_(2))∶n(BiOBr)=1∶12.The improvement of photocatalytic activity of TiO_(2)-BiOBr composite catalyst is due to the attachment of TiO_(2) particles on the BiOBr layered structure and the outward growth of the structure,which is beneficial to the dominant growth of BiOBr(110)crystal plane with photocatalytic activity.A unique heterostructure was also formed between TiO_(2) and BiOBr,both of which effectively improved the separation efficiency of photogenerated electrons and holes.
作者
张淑娟
冯巧林
李昱卓
贾蕊萌
ZHANG Shujuan;FENG Qiaolin;LI Yuzhuo;JIA Ruimeng(School of Basic Science,Tianjin Agricultural University,Tianjin 300392,China)
出处
《天津科技大学学报》
CAS
2024年第3期35-40,共6页
Journal of Tianjin University of Science & Technology
基金
国家级大学生创新训练计划资助项目(202210061001,202310061105)。
关键词
二氧化钛
溴氧化铋
复合材料
微波法
光催化
titanium dioxide
bismuth bromide
composites
microwave method
photochemical catalysis
