Chinese Journal of Catalysis

Chinese Journal of Catalysis

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Self-assembly synthesis of S-scheme g-C3N4/Bi8(CrO4)O11 for photocatalytic degradation of norfloxacin and bisphenol A

Gu Xiaomenga,b, Chen Taijiea,d, Lei Jiana,b, Yang Yanga,c,*, Zheng Xiuzhena,b, Zhang Sujuanb, Zhu Qiushia, Fu Xianliangb, Meng Suganga,b,c,#, Chen Shifua,b,c   

  1. aKey Laboratory of Green and Precise Synthetic Chemistry and applications, Ministry of Education, Huaibei Normal University, Huaibei 235000, Anhui, China;
    bKey Laboratory of Clean Energy and Green Circulation, College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, Anhui, China;
    cAnhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, Anhui, China;
    dAnhui Key Laboratory of Functional Coordination Compounds, School of Chemistry and Chemical Engineering, Anqing Normal University, Anqing 246011, Anhui, China
  • Received:2021-12-06 Accepted:2022-02-15
  • Contact: * Tel/Fax: +86-561-3802235; E-mail: yangy@chnu.edu.cn; # E-mail: mengsugang@126.com; $ E-mail: chshifu@chnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (52002142, 51972134); the Project of Anhui Province for Excellent Young Talents in Universities (gxyq2019029, gxbjZD2020066); the funds for creative postgraduates of Huaibei Normal University (yx2021019); Natural Science Foundation of Anhui Province (2108085MB43, KJ2015TD003); the Project of Key Laboratory of Green and Precise Synthetic Chemistry and Applications (2020KF01); the fund of the State Key Laboratory of Catalysis in DICP (N-20-09 and N-20-10); Innovation Team of Scientific Research Platform of Anhui Province, China (KJ2015TD001); Shanghai Tongji Gao Tingyi Environmental Science & Technology Development Foundation, China (STGEF).

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Abstract: abstract: To realize the high-efficiency photodegradation of antibiotics, a novel S-scheme heterojunction photocatalyst g-C3N4/Bi8(CrO4)O11 was proposed and successfully prepared in this work. The 10% g-C3N4/Bi8(CrO4)O11 heterojunction exhibits the highest degradation rate of norfloxacin (NOR) and bisphenol A (BPA). The degradation rate of NOR on 10% g-C3N4/Bi8(CrO4)O11 is about 1.38 and 2.33 times higher than that of pure Bi8(CrO4)O11 and g-C3N4, respectively. Further, the degradation rate of BPA over 10% g-C3N4/Bi8(CrO4)O11 heterojunction is bout 1.35 and 9.11 times higher than that of pure Bi8(CrO4)O11 and g-C3N4, respectively. The formation of S-scheme heterojunction facilitates the separation of photogenerated electron-hole pairs and reduces the recombination of charge carriers, which was confirmed by photocurrent, electrochemical impedance spectroscopy, steady-state and time-resolved transient photoluminescence spectrum, etc. The in-situ X-ray photoelectron spectroscopy, radical trapping experiments and electron paramagnetic resonance results demonstrate that the charge transfer is in accord with S-scheme mechanism.

Key words: Bi8(CrO4)O11, g-C3N4, S-scheme, Photocatalytic degradation, Antibiotics