Constructing 0D/1D Ag3PO4/TiO2 S-scheme heterojunction for efficient photodegradation and oxygen evolution

doi:10.1016/S1872-2067(22)64099-3

Abstract

Abstract:

An S-scheme heterojunction photocatalyst is capable of boosting photogenerated carrier separation and transfer, thus maintaining high photooxidation and photoredox ability. Herein, a 0D Ag₃PO₄ nanoparticles (NPs)/1D TiO₂ nanofibers (NFs) S-scheme heterojunction with intimate interfacial contact was designed via the the hydro-thermal method. Benefiting from the abundant hydroxyl groups and size confinement effect of TiO₂ NFs, the average diameter of the Ag₃PO₄ nanoparticles decreased from 100 to 22 nm, which favored the construction of a 0D/1D geometry heterojunction. The multifunctional Ag₃PO₄/TiO₂ sample exhibited excellent photocatalytic activity and stability in photocatalytic oxygen production (726 µmol/g/h) and photocatalytic degradation of various organic contaminants such as rhodamine B (100%), phenol (60%) and tetracycline hydrochloride (100%). The significant improvements in the photocatalytic performance and stability can be attributed to the intimate interfacial contacts and rich active sites of 0D/1D geometry, fast charge carrier migration, and outstanding photoredox properties induced by the S-scheme charge-transfer route. This work offers a promising strategy for constructing 0D/1D S-scheme heterojunction photocatalysts for improved photocatalytic performance.

Key words: S-Scheme heterojunction, 0D/1D, Ag₃PO₄/TiO₂, Oxygen production, Photocatalytic degradation

Yukun Zhu, Yan Zhuang, Lele Wang, Hua Tang, Xianfeng Meng, Xilin She. Constructing 0D/1D Ag₃PO₄/TiO₂ S-scheme heterojunction for efficient photodegradation and oxygen evolution[J]. Chinese Journal of Catalysis, 2022, 43(10): 2558-2568.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64099-3

https://www.cjcatal.com/EN/Y2022/V43/I10/2558

Figures/Tables 14

Scheme 1. Schematic illustration of the synthesis of the 0D/1D Ag3PO4/TiO2 S-scheme heterostructure by an electrostatic self-assembly approach.

Fig. 1. XRD patterns (a), FTIR spectra (b) and Raman spectra (c) of the samples.

Fig. 2. The SEM images of Ag3PO4 (a) and Ag3PO4/TiO2 NFs (b). (c) The EDS profile of Ag3PO4/TiO2 NFs. The TEM images (d), HRTEM images (e,g) and the corresponding particle size distributions of Ag3PO4 in Ag3PO4/TiO2 NFs (f). (h,i) The SAED image of Ag3PO4/TiO2.

Fig. 3. XPS profiles of the Ag3PO4/TiO2 sample. (a) Survey spectrum; (b) Ag 3d; (c) Ti 2p; (d) P 2p spectrum.

Fig. 4. Time course (a) and comparison of the O2 evolution rates (b) over different samples.

Fig. 5. Photocatalytic degradation of RhB (a), phenol (b) and TC (c) under visible light. The corresponding -ln(C/C0) vs. reaction time plots of RhB (d), phenol (e) and TC (f).

Fig. 6. (a) Photocatalytic degradation of TC in the presence of Ag3PO4/TiO2, mechanical mixing sample, Ag3PO4/P25 and Ag3PO4/TiO2 NPs. (b) the kinetic fit for (a).

Fig. 7. Photocatalytic degradation of RhB (a), phenol (b) and TC (c) under UV-vis light. The corresponding -ln(C/C0) vs. reaction time plots of RhB (d), phenol (e) and TC (f).

Fig. 8. Cycle experiments of Ag3PO4/TiO2 and Ag3PO4 for photocatalytic degradation of RhB with visible light (a) and UV-visible light (b) irradiation. XRD patterns (c) and TEM (up) and HRTEM (down) images (d) of Ag3PO4/TiO2 sample before and after the reaction.

Fig. 9. UV-vis spectra (a), the (αhν)1/2 vs. hν plots (b) of Ag3PO4 and TiO2. (c,d) Mott-Schottky plots of TiO2 NFs and Ag3PO4 particles.

Fig. 10. PL spectra (a), ns-level time-resolved PL decay spectra (b), transient photocurrent responses (c) and EIS Nyquist plots (d) of Ag3PO4/TiO2, Ag3PO4 and TiO2 samples.

Fig. 11. (a) SPV spectra of Ag3PO4/TiO2, Ag3PO4 and TiO2 samples. Work function for the TiO2 (b) and Ag3PO4 (c). (d) EPR spectra.

Fig. 12. Effect of radical scavengers on the degradation efficiency of RhB by Ag3PO4/TiO2 under visible and UV-vis light irradiation.

Fig. 13. (a,b) Band energy alignments of the TiO2 and Ag3PO4 before and after contacting. Possible mechanism for the S-scheme heterojunction electron-hole migration pathway in the degradation (c) and OER (d) reaction over the Ag3PO4/TiO2 heterojunction.

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Constructing 0D/1D Ag₃PO₄/TiO₂ S-scheme heterojunction for efficient photodegradation and oxygen evolution

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