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Tuning the particle size, physical properties, and photocatalytic activity of Ag3PO4 materials by changing the Ag+/PO43- ratio |
| Hung N M1,3, Oanh L T M1,2,†, Chung D P2, Thang D V1.3, Mai V T1,4, Hang L T1,5, and Minh N V1,2 |
1 Center for Nano Science and Technology, Hanoi National University of Education, 136 Xuan Thuy Road, Cau Giay District, Hanoi 100000, Vietnam;
2 Department of Physics, Hanoi National University of Education, 136 Xuan Thuy Road, Cau Giay District, Hanoi 100000, Vietnam;
3 Hanoi University of Mining and Geology, Duc Thang Ward, North Tu Liem District, Hanoi 100000, Vietnam;
4 Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi 100000, Vietnam;
5 Faculty of Basic Sciences, Hanoi University of Natural Resources and Environment, 41 A Phu Dien Road, North Tu Liem, Hanoi 100000, Vietnam |
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Abstract This study demonstrates the influence of the Ag+/PO43- ratio in precursor solution on the crystal structural formation, morphology, physical properties, and photocatalytic performance of a Ag3PO4 photocatalyst that is fabricated, using a facile precipitation method, from AgNO3 and Na2HPO4·12H2O. The material characterizations were carried out using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) surface area, Fourier transform infrared (FTIR) absorption, Raman scattering, x-ray photoelectron spectroscopy (XPS), UV-vis absorption, and photoluminescence (PL). The results show that Ag3PO4 crystallizes better when the excess PO43- content increases, and the lattice parameters decrease slightly, while the crystal diameter and the particle size increase. This change is also observed in the Raman scattering and FTIR spectra with the increase in the vibration frequency of the [PO4] group. The compression of the [PO4] unit was also confirmed in the XPS spectra with the shift of P 2p peaks toward higher binding energy. The photocatalytic results showed that the samples synthesized from excess PO43- solution exhibited higher photocatalytic performance compared to the sample with a Ag+/PO43- ratio of 3:1. A sample prepared from the precursor solution with a Ag+/PO43- ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight, completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light irradiation. This is attributed to the high crystallinity, small particle size and low electron-hole recombination rate of the sample.
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Received: 21 March 2022
Revised: 27 May 2022
Accepted manuscript online: 28 July 2022
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PACS:
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81.05.Zx
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(New materials: theory, design, and fabrication)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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81.16.Be
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(Chemical synthesis methods)
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| Fund: Project supported by a scientific and technological project at the level of Ministry of Education and Training (Grant No. B2020-MDA-11). |
Corresponding Authors:
Oanh L T M
E-mail: lemaioanh@gmail.com
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Cite this article:
Hung N M, Oanh L T M, Chung D P, Thang D V, Mai V T, Hang L T, and Minh N V Tuning the particle size, physical properties, and photocatalytic activity of Ag3PO4 materials by changing the Ag+/PO43- ratio 2023 Chin. Phys. B 32 038102
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