Acta Phys. -Chim. Sin.

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0D/2D Carbon Nitride Quantum Dots (CNQDs)/BiOBr S-Scheme Heterojunction for Robust Photocatalytic Degradation and H2O2 Production

Zhongqi Zan1, Xibao Li1, Xiaoming Gao2, Juntong Huang1, Yidan Luo1, Lu Han3   

  1. 1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
    2 Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an 716000, Shaanxi Province, China;
    3 School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning Province, China
  • Received:2022-09-12 Revised:2022-11-01 Accepted:2022-11-24 Published:2022-11-29
  • Contact: Xibao Li, Juntong Huang, Lu Han E-mail:lixibao@nchu.edu.cn;huangjt@nchu.edu.cn;hanlu@ustl.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51962023, 22262024, 51862024), the Natural Science Foundation of Jiangxi Province, China (20212BAB204045), the Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, China (Nanchang Hangkong University) (ES202002077).

Abstract: The construction of heterojunctions is a method employed to inhibit the rapid recombination of photogenerated carriers. In this work, zero-dimensional (0D) g-C3N4 quantum dots (CNQDs) were composited with two-dimensional (2D) BiOBr for the first time using the typical hydrothermal method under the conditions of a high temperature and high pressure, and a 0D/2D CNQD/BiOBr S-scheme heterojunction with an intimate-contact interface was formed. The π-electrons in the heterocycle of the CNQDs were bound to BiOBr by interaction. The apparent reaction rate constants generated by CNQDs/BiOB-1.50% for tetracycline (TC) and ciprofloxacin (CIP) degradation and H2O2 production were 2.02, 2.91, and 1.54 times that of the original BiOBr, respectively. In the cycle test, CNQDs/BiOBr-1.50% displayed a relatively high photocatalytic activity and structural stability. X-ray photoelectron spectroscopy (XPS) analysis showed that the π electrons in the CNQDs interacted with BiOBr, and also confirmed the flow of photogenerated electrons in this heterojunction. This successfully constructed S-scheme exhibited extraordinary photocatalytic activity and stability. The more active species and stable catalytic activity were attributed to the distinctive transfer mechanism of the carriers. This work will provide reference for constructing 0D/2D S-scheme heterojunctions for the degradation of organic pollutants and in situ production of H2O2.

Key words: Photocatalysis, Quantum dots, S-scheme, Catalytic activity, H2O2

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