Fabrication of Z-Scheme WO3/KNbO3 Photocatalyst with Enhanced Separation of Charge Carriers

doi:10.1007/s40242-020-9106-5

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (5): 901-907.doi: 10.1007/s40242-020-9106-5

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Fabrication of Z-Scheme WO₃/KNbO₃ Photocatalyst with Enhanced Separation of Charge Carriers

ZHENG Xiuzhen¹, HAN Huijuan¹, YE Xiangju³, MENG Sugang^1,2, ZHAO Shuangshuang¹, WANG Xiangxiang¹, CHEN Shifu¹

1. College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P. R. China;
2. State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, P. R. China;
3. College of Chemistry and Material Engineering, Anhui Science and Technology University, Fengyang 233100, P. R. China

Received:2019-12-25 Revised:2020-01-20 Online:2020-10-01 Published:2020-10-01
Contact: MENG Sugang, CHEN Shifu E-mail:mengsugang@126.com;chshifu@chnu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.51472005, 51772118 and 21607027), the Natural Science Foundation of Anhui Province, China(No.1608085QB37), the Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, China(No.SKLPEE-KF201804), the Natural Science Foundation of Educational Committee of Anhui Province, China(Nos.KJ2018A0387 and KJ2019A0601), the Project of Anhui Province for Excellent Young Talents in Universities, China(No.gxyq2019029), and the Graduate Innovation Foundation of Huaibei Normal University, China(No.ycx201901003)

Abstract

Abstract: Z-Scheme photocatalysts as a research focus perform strong redox capability and high photocatalytic performance. WO₃/KNbO₃ photocatalysts were fabricated by ball milling method, and performed higher photocatalytic activity in liquid degradation(rhodamine B, methylene blue and bisphenol A), compared with WO₃ or KNbO₃ monomer. This is due to that Z-scheme heterojunction is formed between WO₃ and KNbO₃, and the holes photo-excited in valence band of KNbO₃ are quickly combined with the electrons in conduction band of WO₃. The electrons accumulated in conduction band of KNbO₃ show high reducibility, thereby reducing O₂ to ^·O₂^-, and the holes in valence band of WO₃ show high oxidative to oxidize H₂O to ^·OH, respectively. Furthermore, it is proved by means of electron spin resonance(ESR) spectra, terephthalic acid photoluminescence probing technique(TA-PL), and UV-Vis absorption spectra of nitroblue tetrazolium. This work indicates that the fabrication of Z-scheme structure can improve the photocatalytic activity by efficiently separating the photogenerated electrons and holes in the photocatalytic reaction system, which is helpful to deeply understand the migration mechanism of photoexcited carrier(band-band transfer and Z-scheme transfer) in heterojunction photocatalysts.

Key words: WO₃/KNbO₃, Z-Scheme, Photogenerated electron and hole, Photocatalytic degradation, Active species

ZHENG Xiuzhen, HAN Huijuan, YE Xiangju, MENG Sugang, ZHAO Shuangshuang, WANG Xiangxiang, CHEN Shifu. Fabrication of Z-Scheme WO₃/KNbO₃ Photocatalyst with Enhanced Separation of Charge Carriers[J]. Chemical Research in Chinese Universities, 2020, 36(5): 901-907.

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Fabrication of Z-Scheme WO₃/KNbO₃ Photocatalyst with Enhanced Separation of Charge Carriers

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