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

doi:10.7503/cjcu20190546

高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (4): 742.doi: 10.7503/cjcu20190546

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

刘东旭,陈雪冰,杨霞,张静(),陈常东

辽宁石油化工大学化学化工与环境学部, 辽宁省清洁能源催化材料重点实验室, 辽宁省先进清洁能源材料化学工程实验室, 抚顺 113001

收稿日期:2019-10-23 出版日期:2020-04-10 发布日期:2020-02-07
通讯作者: 张静 E-mail:jingzhang_dicp@live.cn
基金资助:
国家自然科学基金(21573101);辽宁省“兴辽英才计划”项目(XLYC1902065);辽宁省-沈阳材料科学国家研究中心联合研发基金(20180510002);辽宁省教育厅科学技术研究项目(No.L2019015)

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

LIU Dongxu,CHEN Xuebing,YANG Xia,ZHANG Jing(),CHEN Changdong

Liaoning Key Laboratory for Green Energy & Catalytic Materials(GECM), Liaoning Engineering Laboratory for Advanced Green Energy & Materials Chemistry(AGEMC), College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China

Received:2019-10-23 Online:2020-04-10 Published:2020-02-07
Contact: Jing ZHANG E-mail:jingzhang_dicp@live.cn
Supported by:
† Supported by the National Natural Science Foundation of China(21573101);the Liaoning Revitalization Talents Program, China(XLYC1902065);the Joint Research Fund of Liaoning-Shenyang National Laboratory for Materials Science, China(20180510002);the Science & Technology Research Program of Liaoning Provincial Education Department, China(No.L2019015)

摘要/Abstract

摘要：

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(RhB)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RhB(或4-CP)的活性是γ-Bi₂O₃的32倍(或10.4倍)和α/γ-Bi₂O₃的4.4倍(或2.2倍). 光电性质表征结果证实, Bi₄Ti₃O₁₂@α/γ-Bi₂O₃三元同素结具有高效的光生电荷分离和迁移效率, 这是Bi₄Ti₃O₁₂@α/γ-Bi₂O₃三元同素结具有较高光催化性能的主要原因之一.

关键词: 氧化铋, 钛酸铋, 三元同素结, 梯度能级, 光降解

Abstract:

Based on the matched band structure of γ-Bi₂O₃, α-Bi₂O₃, and Bi₄Ti₃O₁₂, the ‘ternary isotype junction’ Bi₄Ti₃O₁₂@α/γ-Bi₂O₃ 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 with γ-Bi₂O₃ and α/γ-Bi₂O₃, Bi₄Ti₃O₁₂@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%Bi₄Ti₃O₁₂@α/γ-Bi₂O₃ sample), the photocatalytic degradation rate for RhB(or 4-CP) is 4.4 times(or 2.2 times) that of α/γ-Bi₂O₃, even 32 times(or 10.4 times) that of γ-Bi₂O₃. The optoelectronic property measurements confirm that greatly improved photogenerated charges separation and transference efficiency has been realized on Bi₄Ti₃O₁₂@α/γ-Bi₂O₃ ternary isotype junction, which is one of the main reasons for the high photocatalytic performance of Bi₄Ti₃O₁₂@α/γ-Bi₂O₃. 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.

Key words: Bi₂O₃, Bi₄Ti₃O₁₂, Ternary isotype junction, Gradient energy level, Photodegradation

中图分类号:

O643.3

TrendMD:

刘东旭, 陈雪冰, 杨霞, 张静, 陈常东. 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. 高等学校化学学报, 2020, 41(4): 742.

LIU Dongxu, CHEN Xuebing, YANG Xia, ZHANG Jing, CHEN Changdong. Controllable Fabrication of Photogenerated Charges Gradient Continuous Transfer Chain to Enhance Photocatalytic Performance ^†. Chem. J. Chinese Universities, 2020, 41(4): 742.

图/表 9

Fig.1 Mott-Schottky curves(A), UV-Vis diffuse reflectance spectra(B) and schematic illustration of the band structures of γ-Bi2O3, α-Bi2O3 and Bi4Ti3O12 samples(C)Inset of (B): plots of (αhν)2 νs. photon energy.

Fig.2 XRD patterns of γ-Bi2O3, α/γ-Bi2O3 and nBTO@α/γ-Bi2O3 samples

Fig.3 SEM images of γ-Bi2O3(A), α/γ-Bi2O3(B), 0.3%BTO@α/γ-Bi2O3(C), 0.5%BTO@α/γ-Bi2O3(D) and 3%BTO@α/γ-Bi2O3(E) samples and EDS pattern of 3%BTO@α/γ-Bi2O3 sample(F)

Scheme 1 Schematic illustration of the fabrication process for the BTO@α/γ-Bi2O3

Fig.4 UV-Vis DRS(A) and SPV spectra(B) of γ-Bi2O3, α/γ-Bi2O3 and nBTO@α/γ-Bi2O3 samples

Fig.5 Photocatalytic degradation of RhB(A) and 4-CP(B) by γ-Bi2O3, α/γ-Bi2O3, and nBTO@α/γ-Bi2O3 samplesa. γ-Bi2O3; b. α/γ-Bi2O3; c. 0.3%BTO@α/γ-Bi2O3; d. 0.5%BTO@α/γ-Bi2O3; e. 3%BTO@α/γ-Bi2O3.

Fig.6 Stability of 0.5%BTO@α/γ-Bi2O3 sample for photocatalytic degradation of RhB(A) and 4-CP(B)

Fig.7 Effects of scavengers for photocatalytic degradation of RhB(A) and 4-CP(B) by 0.5%BTO@α/γ-Bi2O3 sample

Scheme 2 Proposed mechanism of the photocatalytic activity on BTO@α/γ-Bi2O3 ternary isotype junction

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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

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

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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

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

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