ENHANCED PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE BY Ag/W CO-MODIFIED TiO2

Phạm Tuấn Anh; Nguyễn Thị Thúy; Đặng Viết Quang

doi:10.34238/tnu-jst.13195

ENHANCED PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE BY Ag/W CO-MODIFIED TiO2

About this article

Received: 08/07/25 Revised: 21/11/25 Published: 25/11/25

Authors

1. Pham Tuan Anh, Phenikaa University
2. Nguyen Thi Thuy, Phenikaa University
3. Dang Viet Quang , Phenikaa University

Abstract

In this study, TiO₂ is modified using a wet impregnation method with AgNO₃ and Na₂WO₄solutions. The molar ratios of each element in the mixture, Ag/Ti and W/Ti, range from 0.01 to 0.5%. After impregnation, samples are dried and calcined at 500 °C to enhance bonding between Ag and W with TiO₂. The material's characteristics are investigated using Scanning Electron Microscopy, X-ray Diffraction, Fourier Transform Infrared Spectroscopy, and UV-Vis Diffuse Reflectance Spectroscopy. The photocatalytic activity of photocatalyst is studied through the degradation of methylene blue solutions under Ultraviolet radiation. The results show that the crystal structure and band gap energy of TiO₂ do not change considerably, however, the photocatalytic activity of TiO₂ is significantly increased. TiO₂ treated with AgNO₃ and Na₂WO₄ solutions at a molar ratio of 0.05% exhibits the best methylene blue degradation efficiency, achieving 68% compared to the unmodified TiO₂ material at 62%. These results indicate that wet impregnation is a simple and effective method for modifying TiO₂.

Keywords

Modification; Semiconductor; Photocatalyst; TiO2; Methylene blue

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DOI: https://doi.org/10.34238/tnu-jst.13195

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