文献类型：期刊文献

英文题名：Enhanced Efficiency of Interfacial Charge Transfer over Ag3PO4/BiPO4@CNTs Photocatalyst for Degradation of Amoxicillin: Synergistic Effect of n-p Heterojunction and Conjugated channels

作者：Wu, Yadong Luo, Yongxin Yang, Chaoseng Wu, Qijun

第一作者：Wu, Yadong

机构：[1] School of Chemical Engineering, School of Artificial Intelligence and Electrical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [2] College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550003, China

第一机构：贵州理工学院化学工程学院

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240167360)

语种：英文

外文关键词：Bismuth compounds - Carbon nanotubes - Charge transfer - Conjugated polymers - Density functional theory - Excited states - Rate constants - Silver compounds

摘要：Inspired by the remarkable efficiency in separating of photogenerated carriers achieved through the fabrication of conjugated polymeric photocatalysts. A novel photocatalytic system, utilizing carbon nanotubes coated with an Ag3PO4/BiPO4 p-n heterostructure (ABCx), has been developed for the degradation of amoxicillin in its aquatic habitat under visible light. The ABCx conjugated photocatalysts shows excellent photogenerated charge separation efficiency, material stability, and efficient amoxicillin removal ability. The first-order kinetic constants of ABCx (x[‰]=2, 5, 7) exhibited a 1.30-fold, 2.43-fold, and 1.97-fold enhancement in comparison to those of Ag3PO4/BiPO4 for the degradation of amoxicillin, respectively. The FT-IR and photochemical conversion revealed the presence of delocalized π-bonds within the conjugated system (P=C-C=C···C=O), which can lead to the formation of a rapidly generated and long-lived triplet state T1 rather than the lowest singlet excited state S1 generated from either direct excitation or reverse intersystem crossing. In situ XPS analysis confirmed that the migration of photogenerated charges from BiPO4 to Ag3PO4 through a conjugated redox pathway. The density functional theory (DFT) was employed to investigate the work function, resulting in the determination of -4.27 eV and -5.09 eV for the Fermi levels of Ag3PO4 and BiPO4, respectively. And further confirmed the migration direction of photogenerated charges. In summary, the incorporation of conjugated π bonds via inorganic semiconductor heterojunction serves to enhance the efficiency of photogenerated charge separation and transport. ? 2024, The Authors. All rights reserved.