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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

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Front. Chem. Sci. Eng.    2023, Vol. 17 Issue (12) : 1925-1936    https://doi.org/10.1007/s11705-023-2344-6
RESEARCH ARTICLE
All-inorganic TiO2/Cs2AgBiBr6 composite as highly efficient photocatalyst under visible light irradiation
Jianzhong Ma1,3,4(), Lu Wen1,4, Qianqian Fan1,3,4, Siying Wei2,4, Xueyun Hu1,4, Fan Yang4,5
1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
2. College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
3. Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry (Ministry of Education), Shaanxi University of Science and Technology, Xi’an 710021, China
4. Xi’an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science and Technology, Xi’an 710021, China
5. College of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
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Abstract

In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO2 in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs2AgBiBr6 double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO2/Cs2AgBiBr6 composite, which was identified as an S-cheme heterojunction. TiO2/Cs2AgBiBr6 composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO2 could be boosted to 0.1369 min–1. This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO2/Cs2AgBiBr6 composites, which will facilitate the generation of new ideas for improving TiO2’s photocatalytic performance.
Keywords Cs2AgBiBr6 nanocrystals      visible-light photocatalyst      Cs2AgBiBr6/TiO2 heterojunction     
Corresponding Author(s): Jianzhong Ma   
Just Accepted Date: 04 July 2023   Online First Date: 06 September 2023    Issue Date: 30 November 2023
 Cite this article:   
Jianzhong Ma,Lu Wen,Qianqian Fan, et al. All-inorganic TiO2/Cs2AgBiBr6 composite as highly efficient photocatalyst under visible light irradiation[J]. Front. Chem. Sci. Eng., 2023, 17(12): 1925-1936.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-023-2344-6
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I12/1925
Fig.1  (a) TEM and (b) HRTEM images of Cs2AgBiBr6 NCs; (c) TEM and (d) HRTEM images of TiO2/Cs2AgBiBr6 composites; (e–i) energy dispersive X-ray spectroscopy image of Cs2AgBiBr6 NCs and the corresponding element mappings showing the elemental distribution of (f) Cs, (g) Ag, (h) Bi, and (i) Br.
Fig.2  (a) FTIR and (b) XRD images of Cs2AgBiBr6, TiO2/Cs2AgBiBr6 composite and TiO2.
Fig.3  (a) N2 adsorption–desorption isotherms and (b) Barrett-Joyner-Halenda pore size distribution curves of TiO2 and TiO2/Cs2AgBiBr6 composite.
Fig.4  (a) Survey XPS spectra of the TiO2, Cs2AgBiBr6 and TiO2/Cs2AgBiBr6 and high-resolution XPS spectrum of (b) Cs 3d, (c) Ag 3d, (d) Bi 4f, (e) Br 3d, and (f) Ti 2p.
Fig.5  (a) UV–vis spectrum and (b) the Tauc plots of TiO2, Cs2AgBiBr6 NCs and TiO2/Cs2AgBiBr6; (c) energy band structure diagram of TiO2 and TiO2 and Cs2AgBiBr6 NCs; (d) PL spectra of TiO2, Cs2AgBiBr6 NCs and TiO2/Cs2AgBiBr6.
Fig.6  (a) Photocatalytic degradation curve, (b) kinetics fitting diagram and (c) rate constants diagram of RhB by TiO2/Cs2AgBiBr6 composite prepared at different Cs2AgBiBr6 NCs usages, Cs2AgBiBr6 NCs and TiO2 under visible light.
MaterialLight sourceDegradation rate/%Light duration/minRef.
TiO2/Cs2AgBiBr6Visible98.640This work
K-PHI/TiO2Visible96.340[25]
TiO2/g-C3N4Simulated sunlight93.07100[26]
CeO2-TiO2Visible63240[27]
TiO2/Cr2S3/GOVisible96.698[28]
TiO2-BiVO4Simulated sunlight97.7330[29]
Tab.1  Comparison of the photocatalytic degradation of TiO2/Cs2AgBiBr6 toward RhB with other photocatalysts in the reported literatures
Fig.7  (a) Recyclic stability of TiO2/Cs2AgBiBr6 composite for photocatalytic degradation of RhB; (b) effect of solution pH on degradation rate of RhB.
Fig.8  TiO2 and Cs2AgBiBr6 NCs: (a) photovoltage spectroscope response analysis, (b) electrochemical impedance spectroscopy, (c) time-resolved PL decay spectra; Mott-Schottky curves of (d) TiO2 and (e) Cs2AgBiBr6.
Fig.9  (a, b, c) The degradation process of RhB solution by TiO2, (d, e, f) Cs2AgBiBr6 NCs, and TiO2/Cs2AgBiBr6: (g, h, i) effects of radical scavenger/quencher including AgNO3, EDTA-2Na, BQ and T-BuOH; ESR spectra of (b, c) TiO2, (e, f) Cs2AgBiBr6 NCs, and (h, i) TiO2/Cs2AgBiBr6 in dark and light.
Fig.10  The proposed possible promoted charge separation mechanism of TiO2/Cs2AgBiBr6 composites under light irradiation: (a) traditional type-II heterojunction; (b–d) S-scheme heterojunction.
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