摘要
通过水解法合成具有高暴露(001)面的BiOBr/Ti3C2复合光催化剂,利用不同手段对样品进行表征。以罗丹明B为目标污染物,评价了不同样品的可见光催化性能。结果表明,层状Ti3C2添加量为20.0wt%时,BiOBr/Ti3C2复合光催化剂在60 min内对罗丹明B的降解效率为97.1%,比BiOBr的降解效率提高了34.7%。引入层状Ti3C2使得BiOBr与Ti3C2界面形成肖特基结能垒,产生有效的电子陷阱抑制了光生电子–空穴对的复合,从而大大提高了BiOBr的可见光催化活性。BiOBr/Ti3C2复合光催化剂经5次循环实验后,降解效率仍保持在91.0%,表明其具有良好的稳定性。活性物种捕获实验表明,超氧自由基为罗丹明B可见光催化降解中的主要活性物种,并据此提出了可能的光催化机理。
BiOBr/Ti3C2 composite photocatalyst with highly exposed(001)facets was synthesized by hydrolysis method.Different instruments were employed to characterize the samples.The visible light photocatalytic performance of different samples were evaluated by using Rhodamine B as the target pollutant.The results show that the degradation efficiency of Rhodamine B reaches 97.1%within 60 min over BiOBr/Ti3C2(20.0wt%Ti3C2 addidion)composite photocatalyst,which is 34.7%higher than that of BiOBr.With the introduction of layered Ti3C2,the interface between BiOBr and Ti3C2 forms the Schottky junction energy barrier,which produces effective electron traps to inhibit the combination of photogenic electron-hole pairs,and greatly improves the visible light photocatalytic activity of BiOBr.After 5 cycles,the degradation efficiency of BiOBr/Ti3C2 composite photocatalyst remains 91.0%,showing reliable stability.The active species capture experiment shows that superoxide radical(•O2–)is the main active species in the photocatalytic degradation of Rhodamine B,and a possible photocatalytic mechanism is proposed accordingly.
作者
李志锋
谭杰
杨晓飞
蔺祖弘
郇正来
张婷婷
LI Zhifeng;TAN Jie;YANG Xiaofei;LIN Zuhong;HUAN Zhenglai;ZHANG Tingting(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Beijing Centre for Resource and Environmental Research,Beijing 100029,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第11期1247-1254,共8页
Journal of Inorganic Materials
基金
国家自然科学基金(41977142)
水体污染控制与治理科技重大专项(2018ZX07111003)。
