BaTiO3/CeO2 heterojunction photocatalysts: design, construction and a novel application for the photocatalytic degradation of oxytetracycline hydrochloride
Author:
Yu Chuan12, Wang Shifa12, Zhang Jing12, Gao Huajing123, Chen Xiangyu12, Yang Hua3, Fang Leiming4, Chen Xiping4, Yi Zao5, Li Dengfeng6
Affiliation:
1. School of Electronic and Information Engineering , Chongqing Three Gorges University , Chongqing , Wanzhou , 404000 , China 2. Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area , Chongqing Three Gorges University , Chongqing , Wanzhou , 404000 , China 3. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals , Lanzhou University of Technology , Lanzhou 730050 , China 4. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics , Sichuan , Mianyang , 621900 , China 5. Joint Laboratory for Extreme Conditions Matter Properties , Southwest University of Science and Technology , Mianyang 621010 , China 6. School of Science , Chongqing University of Posts and Telecommunications , Nan’an District , 400065 Chongqing , China
Abstract
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.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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