Guan Hailin, Tian Yuefeng, Dong Alideertu, Su Yiguo
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, Inner Mongolia, People's Republic of China.
Nanoscale Res Lett. 2020 Jul 22;15(1):152. doi: 10.1186/s11671-020-03380-3.
In this work, Ag/BiVO heterostructural photocatalysts were developed in order to reveal exceptional structural-dependent photoinduced charge migration kinetics as well as the underlying photocatalytic antibacterial dynamic process. The structure-dependent interface of BiVO and Ag nanoparticles was successfully constructed to improve the photoinduced interface charge transfer efficiency and interface correlation. DFT calculation indicated that a net charge of about 0.33 e between Ag and tz-BiVO was achieved by extraordinary interface charge transfer, being far larger than that between Ag and ms-BiVO. Larger net charge has consequences on mobility of charge carriers of tz-BiVO that can raise the migration and separation of charge carriers for Ag/tz-BiVO heterojunction. Fine interfacial contact between Ag and tz-BiVO led to the optimized photocatalytic performance toward E. coli inactivation, being predominately higher than that of tz-BiVO, ms-BiVO, and Ag/ms-BiVO catalysts. Besides photocatalytic activity, the thermocatalytic inactivation activity of Ag/tz-BiVO also exhibited a factor of about 7.2 and 3.1 times higher than that of tz-BiVO and Ag/ms-BiVO. Trapping and EPR measurements suggested that the structural-dependent photocatalytic activity of Ag/BiVO mainly originated from the pronounced variation of the capability to produce HO active species, where the capability of generating HO over Ag/tz-BiVO is highly accelerated. Moreover, it cannot be ignored that this study provides an ideal candidate for many aspects, such as environmental and water pollution caused by pathogenic microorganisms and disinfection of medical materials, food packaging, household materials, and public places, etc.
在本工作中，开发了Ag/BiVO异质结构光催化剂，以揭示其独特的结构依赖性光致电荷迁移动力学以及潜在的光催化抗菌动态过程。成功构建了BiVO与Ag纳米颗粒之间的结构依赖性界面，以提高光致界面电荷转移效率和界面相关性。密度泛函理论（DFT）计算表明，通过异常的界面电荷转移，Ag与tz-BiVO之间实现了约0.33 e的净电荷，远大于Ag与ms-BiVO之间的净电荷。更大的净电荷对tz-BiVO的电荷载流子迁移率产生影响，可提高Ag/tz-BiVO异质结中电荷载流子的迁移和分离。Ag与tz-BiVO之间良好的界面接触导致对大肠杆菌灭活的光催化性能得到优化，主要高于tz-BiVO、ms-BiVO和Ag/ms-BiVO催化剂。除了光催化活性外，Ag/tz-BiVO的热催化失活活性也分别比tz-BiVO和Ag/ms-BiVO高约7.2倍和3.1倍。捕获和电子顺磁共振（EPR）测量表明，Ag/BiVO的结构依赖性光催化活性主要源于产生羟基（·OH）活性物种能力的显著变化，其中Ag/tz-BiVO上产生·OH的能力得到极大加速。此外，不可忽视的是，本研究为许多方面提供了理想的候选材料，例如由致病微生物引起的环境和水污染以及医疗材料、食品包装、家用材料和公共场所等的消毒。
