光生电荷梯度连续传递链的构筑及对光催化性能的增强作用

选取能带位置匹配的γ-Bi₂O₃,α-Bi₂O₃和Bi₄Ti₃O₁₂,采用等体积浸渍法原位构筑了具有梯度能级的Bi₄Ti₃O₁₂@α/γ-Bi₂O₃三元同素结光催化剂.光催化降解高浓度罗丹明B(Rh B)和四氯苯酚(4-CP)的实验结果表明,相比于γ-Bi₂O₃和α/γ-Bi₂O₃,Bi₄Ti₃O₁₂@α/γ-Bi₂O₃显示出优异的光催化活性,其中0. 5%Bi₄Ti₃O₁₂@α/γ-Bi₂O₃显示了最佳的光催化性能,光降解...

Controllable Fabrication of Photogenerated Charges Gradient Continuous Transfer Chain to Enhance Photocatalytic Performance

Based on the matched band structure ofγ-Bi 2O3,α-Bi2O3,and Bi4Ti3O12,the‘ternary isotype junction’Bi4Ti3O12@α/γ-Bi 2O 3 with gradient energy levels was synthesized in situ by simple immersion method.The results of photocatalytic degradation of high concentration rhodamine B(RhB)and 4-chlorophenol(4-CP)show that,compared withγ-Bi2O3 andα/γ-Bi2O3,Bi 4Ti3O12@α/γ-Bi2O3 exhibits more remarkable photocatalytic activities.It is worth mentioning that when the mass ratio of Ti/Bi is 0.5%(0.5%Bi 4Ti3O12@α/γ-Bi 2O 3 sample),the photocatalytic degradation rate for RhB(or 4-CP)is 4.4 times(or 2.2 times)that ofα/γ-Bi2O3,even 32 times(or 10.4 times)that ofγ-Bi 2O 3.The optoelectronic property measurements confirm that greatly improved photogenerated charges separation and transference efficiency has been realized on Bi 4Ti 3O 12@α/γ-Bi 2O 3 ternary isotype junction,which is one of the main reasons for the high photocatalytic performance of Bi 4Ti 3O12@α/γ-Bi 2O 3.This paper provides a new way for fabricating high efficiency photogenerated charges transfer chain,then promoting the separation and transference of photogenerated charges,and thus greatly improving the performance of the photocatalysis.