Synthesis and investigation of photocatalytic and CO2 photoreductive properties of Ag/TiO2 nanowires

Vu Duy Thinh; Vu Dinh Lam; Ta Ngoc Bach; Phung Thi Thu; Le Thi Hong Phong; Do Hung Manh; Trinh Xuan Anh; Ngo Thi Hong Le

doi:10.51316/jca.2021.114

Authors

Vu Duy Thinh Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Ha Noi
Vu Dinh Lam Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology
Ta Ngoc Bach Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, VIETNAM
Phung Thi Thu University of Science and Technology of Hanoi
Le Thi Hong Phong Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, VIETNAM
Do Hung Manh Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Ha Noi
Trinh Xuan Anh Hanoi University of Science and Technology
Ngo Thi Hong Le Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, VIETNAM

DOI:

https://doi.org/10.51316/jca.2021.114

Keywords:

Ag-decorated TiO2 nanowires, methyl orange, methane, Photocatalytic activity, photoreduction

Abstract

Silver nanoparticles with the diameter of 5 – 10 nm were successfully deposited on TiO₂ nanowires by a facile and low-cost photoreduction method in alkaline solution under UV irradiation. The mutual coordination between light irradiation and NH₄OH reduction gives rise to the formation and decoration of the Ag nanoparticles on the surface of TiO₂ nanowires. The morphology, crystal structure, and optical properties of as-prepared products were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffraction, and UV-vis spectroscopy. Noticeably, the Ag nanoparticles play an important role to the transition from titanate to anatase and rutile phases in TiO₂. The photocatalytic activity of all samples was evaluated by means of the degradation of methyl orange (MO) under the visible light irradiation. The results indicated that the presence of the Ag nanoparticle significantly improved the catalytic performance of TiO₂ in the visible region, which could be attributed to the local surface plasmon resonance effect of the Ag. Nearly 99% MO was photo-decomposed within 90 minutes in the presence of Ag/TiO₂, while there was only 70% MO degraded with the TiO₂catalyst. Furthermore, the Ag-decorated TiO₂ nanowires also show good photo-conversion CO₂ to methane with high selectivity. The amount of CH₄ obtained over 1g Ag/TiO₂ is approximately twice as much as that of TiO₂

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