가시광선 활용을 위한 Ag 도핑 흑색 ZnO 나노 광촉매 합성

• Published in: Biuletyn Uniejowski Vol. 56; no. 3; pp. 208 - 218
• Main Authors: 김의준(Ui-Jun Kim), 김혜민(Hye-Min Kim), 이승효(Seung-Hyo Lee)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2023
• Subjects: 기계공학; Visible light; Ag-doped black ZnO; Liquid phase plasma; Photocatalysts; Methylene blue
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JSSE.2023.56.3.208

Photocatalysts are advanced materials which accelerate the photoreaction by providing ordinary reactions with other pathways. The catalysts have various advantages, such as low-cost, low operating temperature and pressure, and long-term use. They are applied to environmental and energy field, including the air and water purification, water splitting for hydrogen production, sterilization and self-cleaning surfaces. However, commercial photocatalysts only absorb ultraviolet light between 100 and 400 nm of wavelength which comprises only 5% in sunlight due to the wide band gap. In addition, rapid recombination of electron-hole pairs reduces the photocatalytic performance. Recently, studies on blackening photocatalysts by laser, thermal, and plasma treatments have been conducted to enhance the absorption of visible light and photocatalytic activity. The disordered structures could yield mid-gap states and vacancies could cause charge carrier trapping. Herein, liquid phase plasma (LPP) is adopted to synthesize Ag-doped black ZnO for the utilization of visible-light. The physical and chemical characteristics of the synthesized photocatalysts are analyzed by SEM/EDS, XRD, XPS and the optical properties of them are investigated using UV/Vis DRS and PL analyses. Lastly, the photocatalytic activity was evaluated using methylene blue as a pollutant.