异质结
光催化
X射线光电子能谱
分解水
材料科学
光化学
光电效应
光电子学
激进的
化学工程
化学
催化作用
生物化学
工程类
有机化学
作者
Jingsong Gao,Shaosheng Rao,Xiaohui Yu,Lele Wang,Jinghang Xu,Juan Yang,Qinqin Liu
标识
DOI:10.1016/j.jcis.2022.07.112
摘要
A Step-scheme (S-scheme) heterojunction can regulate the directional migration of powerful photogenerated carriers and realize high photocatalytic activity. Herein, we propose a novel dimensional matched S-scheme photocatalyst comprising of two-dimensional (2D) TiO2 nanosheets and 2D Bi2O3 nanosheets for environmental and energy applications, such as water sterilization and water splitting. X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance, in-situ irradiated XPS and theoretical calculations provided strong evidence that the photocarrier migration in the TiO2/Bi2O3 composite followed the S-scheme mode, which efficiently prevented the recombination of powerful photocarriers, thereby enabling the heterojunction with a strong redox ability for producing abundant reactive oxygen species. The tight and large 2D/2D interface minimized the distance of photocarrier migration to further extend the lifetime of useful photocarriers (active radicals for sterilization and photoelectrons for H2 generation). The 2D/2D TiO2/Bi2O3 heterojunction demonstrated an improved photocatalytic antibacterial performance with complete inactivation of 4.63 × 107 CFU mL-1Escherichia coli cells within 6 h in water. In addition, the heterojunction displayed a H2 generation rate of 12.08 mmol h-1g-1 through water splitting process. This study provides a potential bifunctional photocatalyst for minimizing the adverse impact of pollution on the environment.
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