Synthesis of TiO2-brookite nanorods and TiO2-Au composites for decomposition of organic dyes in water

Vietnam Journal of Science and Technology - Trang - 2024
Tran Thi Thuong Huyen1, Le Thi Quynh Xuan1, Do Hoang Tung2, Nguyen Truong Son3, Nguyen Thi Minh Thuy4, Pham Thi Thu Hien4, Do Huy Hoang5
1Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
2Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
4Thai Nguyen University of Education, 20 Luong Ngoc Quyen, Quang Trung, Thai Nguyen, Viet Nam
5Faculty of Chemistry, VNU Hanoi University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Ha Noi, Viet Nam

Tóm tắt

This study employed a plasma-liquid interaction technique at room temperature to modify TiO2 nanocrystals in the brookite phase and coat their surface with gold nanoparticles (AuNPs). The technique was further utilized to reduce Au3+ ions to Au0, eliminating the need for chemical agents and reducing reaction time. The resulting TiO2-Au photocatalysts were then tested under visible light to evaluate their ability to degrade the dyes rhodamine 101 (RB101) in water. The findings indicated that the most effective degradation of RB101 molecules occurred at low dye concentrations (10 ppm) and low photocatalyst loadings with a ratio of 4. In comparing two different preparation methods, the TiO2-Au sample created using a micro-plasma process with a direct current (DC) source exhibited higher photocatalytic activity (87 % after 4 hours) compared to the sample created using a plasma jet process with an alternating current (AC) source. This research holds significance for the advancement of photocatalytic materials with potential environmental applications.

Từ khóa

#titanium dioxide #gold #plasma-liquid interaction #photocatalytic #nanorods

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