摘要
笔者采用溶剂热法合成一系列不同掺杂比的Ce-BiOBr光催化剂,用不同比例的乙二醇和水作为溶剂探究乙二醇(EG)对Ce-BiOBr光催化剂形貌的影响.合成的催化剂通过XRD,XPS,SEM,FT-IR,UV-Vis和BET等测试手段进行表征与性能测试,并用于光催化降解卡马西平污染物,探究共存无机离子对Ce-BiOBr光催化性能的影响.结果发现:与BiOBr相比,Ce(Ⅲ)的掺入极大地提高了电子空穴的分离与转移效率;利用不同比例的乙二醇和水作为溶剂时,BiOBr的形貌发生了明显的改变,使得原本的BiOBr纳米片尺寸变小,厚度变薄,团聚成类花状形貌;其中,0.5EG-5%Ce-BiOBr的光催化活性最高,在可见光下70 min可降解98%的卡马西平.根据催化剂的导带、价带电位,以及活性物种捕获实验,提出了可能的光催化反应机制.
In this paper,a series of Ce-BiOBr photocatalysts with different doping ratios were synthesized by solvothermal method,and the effects of ethylene glycol(EG)on the morphology of Ce-BiOBr photocatalysts were investigated by using different ratios of ethylene glycol and water as solvents.The synthesized catalyst was characterized and tested by XRD,XPS,SEM,FT-IR,UV-Vis,BET and other test means.Meanwhile,it was used for photocatalytic degradation of carbamazepine pollutants.The influence of co-existing inorganic ions on Ce-BiOBr activity for carbamazepine photocatalytic degradation was also investigated.The results showed that compared with BiOBr,the incorporation of Ce(Ⅲ)greatly improved the separation and transfer efficiency of electron holes.When different proportions of glycol and water were used as solvents,the morphology of BiOBr was significantly changed by the addition of glycol,which made the BiOBr nanosheets smaller in size and thickness,and agglomerated into flower-like morphology.The photocatalytic activity of 0.5EG-5%Ce-BiOBr was the highest,and 98%carbamazepine could be degraded under visible light only 70 min.According to conduction band,valence band potential and the results of active species capture experiment,the possible photocatalytic reaction mechanism was proposed.
作者
朱婉蓉
宋继梅
裴泽平
杨捷
ZHU Wanrong;SONG Jimei;PEI Zeping;YANG Jie(School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,China)
出处
《安徽大学学报（自然科学版）》
CAS
北大核心
2023年第3期70-81,共12页
Journal of Anhui University(Natural Science Edition)
基金
国家自然科学基金资助项目(21171002)
安徽省自然科学基金资助项目(1708085MB37)。
