BaTiO3/CeO2 heterojunction photocatalysts: design, construction and a novel application for the photocatalytic degradation of oxytetracycline hydrochloride

Chuan Yu; Shifa Wang; Jing Zhang; Huajing Gao; Xiangyu Chen; Hua Yang; Leiming Fang; Xiping Chen; Zao Yi; Dengfeng Li

doi:10.1515/zpch-2022-0072

Published by De Gruyter (O) June 2, 2023

BaTiO₃/CeO₂ heterojunction photocatalysts: design, construction and a novel application for the photocatalytic degradation of oxytetracycline hydrochloride

Chuan Yu , Shifa Wang , Jing Zhang , Huajing Gao , Xiangyu Chen , Hua Yang , Leiming Fang , Xiping Chen , Zao Yi and Dengfeng Li

From the journal Zeitschrift für Physikalische Chemie

https://doi.org/10.1515/zpch-2022-0072

Showing a limited preview of this publication:

Abstract

A polyacrylamide gel method combined with low temperature calcination technology has been developed to synthesize the BaTiO₃/CeO₂ heterojunction photocatalysts, which were formed by hybriding the large BaTiO₃ particles and fine CeO₂ nanoparticles with varied mass percent of CeO₂. Various characterization methods have been used to determine the phase structure, functional group information, elemental composition, microstructure, optical and photocatalytic activity of BaTiO₃/CeO₂ heterojunction photocatalysts. The introduction of CeO₂ into the host lattice of BaTiO₃ does not change the optical band gap value (Eg = 3.20 eV) of the host lattice. As expected, the BaTiO₃/CeO₂ heterojunction photocatalysts exhibit highly enhanced and CeO₂ composition-dependent photocatalytic activity for the degradation of oxytetracycline hydrochloride under simulated sunlight irradiation. The BaTiO₃/5 wt% CeO₂, BaTiO₃/10 wt% CeO₂, and BaTiO₃/15 wt% CeO₂ showed lower photocatalytic activity, while BaTiO₃/20 wt% CeO₂ showed highest photocatalytic activity (96.89 %) over the single component BaTiO₃ and CeO₂ photocatalysts with the initial oxytetracycline hydrochloride concentration, photocatalyst content and irradiation time were 100 mg/L, 1.5 g/L and 120 min, respectively. The enhanced photocatalytic activity of BaTiO₃/20 wt% CeO₂ heterojunction photocatalysts is ascribed to the cooperation between Ce³⁺ and Ce⁴⁺, improved charge transfer and separation of electron-hole pairs generated on irradiation with simulated sunlight and proper amount of surface defects or oxygen vacancies on the BaTiO₃/CeO₂ heterojunction photocatalysts.

Keywords: BaTiO3; CeO2; photocatalytic activity; polyacrylamide gel method; surface defects

Corresponding authors: Shifa Wang, School of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing, Wanzhou, 404000, China; and Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area, Chongqing Three Gorges University, Chongqing, Wanzhou, 404000, China, E-mail: wangshifa2006@yeah.net; Huajing Gao, School of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing, Wanzhou, 404000, China; Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area, Chongqing Three Gorges University, Chongqing, Wanzhou, 404000, China; and State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China, E-mail: ghj2011@yeah.net; and Leiming Fang, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Sichuan, Mianyang, 621900, China, E-mail: flmyaya2008@163.com

Research funding: This work was supported by the Science and Technology Research Program of Chongqing Education Commission of China (KJZD-K202001202, KJQN202201204), the NSAF joint Foundation of China (U2030116), the Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area (No. ZD2020A0401), the Talent Introduction Project (09924601) of Chongqing Three Gorges University and the Scientific Research Fund of Sichuan Provincial Science and Technology Department (2020YJ0137, 2020YFG0467).
Conflict of interest statement: The authors declare that they have no conflict interests.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

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Received: 2022-05-12

Accepted: 2023-05-22

Published Online: 2023-06-02

Published in Print: 2023-07-26

BaTiO₃/CeO₂ heterojunction photocatalysts: design, construction and a novel application for the photocatalytic degradation of oxytetracycline hydrochloride

Abstract

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