A novel S-scheme heterojunction based on 0D/3D CeO2/Bi2O2CO3 for the photocatalytic degradation of organic pollutants

A distinct S-scheme heterojunction 0D/3D CeO2/Bi2O2CO3 photocatalyst was successfully synthesized by a hydrothermal method for the photocatalytic degradation of methylene blue (MB), tetracycline (TC) and aureomycin (AM). Compared with bare Bi2O2CO3 and CeO2, CeO2/Bi2O2CO3 possesses admirable photode...

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Published inNew journal of chemistry Vol. 46; no. 33; pp. 15987 - 15998
Main Authors Wang, Chuantao, Dang, Yuechen, Pang, Xiangxiang, Zhang, Le, Bian, Yujie, Duan, Wen, Yang, Chunming, Yanzhong Zhen, Fu, Feng
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 22.08.2022
Subjects
Cerium oxides
Charge transfer
Contaminants
Density functional theory
Energy bands
Heterojunctions
Light irradiation
Methylene blue
Photocatalysis
Photodegradation
Pollutants
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Summary:A distinct S-scheme heterojunction 0D/3D CeO2/Bi2O2CO3 photocatalyst was successfully synthesized by a hydrothermal method for the photocatalytic degradation of methylene blue (MB), tetracycline (TC) and aureomycin (AM). Compared with bare Bi2O2CO3 and CeO2, CeO2/Bi2O2CO3 possesses admirable photodegradation capacity. Additionally, the influence of the molar ratio of CeO2 in the compounds was also discussed, and the optimal molar ratio was identified as 15% (nCe/nBi), for which the photodegradation of MB reaches 98% in 120 min with light irradiation. Favorable retrogradation effects were achieved in the photodegradation of TC and AM. Furthermore, UV–vis diffuse reflectance spectroscopy revealed that the absorption range of solar illumination was successfully expanded to the visible light range for the CeO2/Bi2O2CO3 composites (with a molar ratio of 15%). Besides, based on photoelectrochemical detection, active species capture experiment and density functional theory (DFT), the constructed catalyst conforms to a step-scheme (S-scheme) heterojunction charge transfer mechanism. The satisfactory degradation activity and the outstanding solar light response performance benefit from the driving force in the space separation of photogenerated carriers, optimized energy band structure and high-quality redox capacity. It is speculated that the novel CeO2/Bi2O2CO3 composite would have broad application prospects in the degradation of organic contaminants.
ISSN:1144-0546
1369-9261
DOI:10.1039/d2nj03192b