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

doi:10.1016/S1872-2067(22)64142-1

Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (10): 2569-2580.DOI: 10.1016/S1872-2067(22)64142-1

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

Xiaomeng Gu^a^,^b, Taijie Chen^a^,^d, Jian Lei^a^,^b, Yang Yang^a^,^c^,^*(), Xiuzhen Zheng^a^,^b, Sujuan Zhang^b, Qiushi Zhu^a, Xianliang Fu^b, Sugang Meng^a^,^b^,^c^,^#(), Shifu Chen^a^,^b^,^c^,^$()

^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 Online:2022-10-18 Published:2022-09-30
Contact: Yang Yang, Sugang Meng, Shifu Chen
Supported by:
National Natural Science Foundation of China(52002142);National Natural Science Foundation of China(51972134);Project of Anhui Province for Excellent Young Talents in Universities(gxyq2019029);Project of Anhui Province for Excellent Young Talents in Universities(gxbjZD2020066);funds for creative postgraduates of Huaibei Normal University(yx2021019);Natural Science Foundation of Anhui Province(2108085MB43);Natural Science Foundation of Anhui Province(KJ2015TD003);Project of Key Laboratory of Green and Precise Synthetic Chemistry and Applications(2020KF01);fund of the State Key Laboratory of Catalysis in DICP(N-20-09);fund of the State Key Laboratory of Catalysis in DICP(N-20-10);Innovation Team of Scientific Research Platform of Anhui Province, China(KJ2015TD001);Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation, China(STGEF)

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

Xiaomeng Gu, Taijie Chen, Jian Lei, Yang Yang, Xiuzhen Zheng, Sujuan Zhang, Qiushi Zhu, Xianliang Fu, Sugang Meng, Shifu Chen. Self-assembly synthesis of S-scheme g-C₃N₄/Bi₈(CrO₄)O₁₁ for photocatalytic degradation of norfloxacin and bisphenol A[J]. Chinese Journal of Catalysis, 2022, 43(10): 2569-2580.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64142-1

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Figures/Tables 11

Fig. 1. Schematic diagram of catalyst synthesis.

Fig. 2. TEM (a,c,e) and HRTEM (b,d,f) images of BCO (a,b), CN (c,d), 10% CN/BCO (e,f).

Fig. 3. XRD (a), FTIR (b), UV-Vis DRS (c) and BET (d) of the typical samples.

Fig. 4. High-resolution survey (a), Bi (b), Cr (c), O (d), C (e) and N (f) XPS spectra of pristine CN/BCO samples tested in darkness and under illumination.

Fig. 5. Photocurrent response (a) and EIS (b) of the typical photocatalysts; steady-state PL spectra (c) and time-resolved transient PL decay (d) of CN, BCO and 10% CN/BCO.

Fig. 6. Mott-Schottky plots of BCO (a), CN (b), CN-M (c) at different frequencies. (d) Estimated band gaps.

Fig. 7. Degradation curves of NOR (a) and BPA (c) over typical catalysts, the corresponding kinetic curves of NOR (b) and BPA (d) over typical catalysts.

Fig. 8. Trapping experiments over 10% CN/BCO photocatalyst with different quenchers during NOR degradation.

Fig. 9. EPR spectra of •OH (a) and •O2- (b) radicals on CN, BCO and CN/BCO heterojunction.

Fig. 10. UPS spectra (a) and VB XPS (b) of CN and BCO.

Fig. 11. (a) Band-gap structure of g-C3N4 and Bi8(CrO4)O11. (b) The internal electric field and band edge bending of the interface after g-C3N4/Bi8(CrO4)O11 contact. (c) S-scheme mechanism of g-C3N4/Bi8(CrO4)O11 under light irradiation.

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

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