Dec, 28, 2023

Vol.56 No.6

Editorial Office

Review

  • The Korean Society of Surface Science and Engineering
  • Volume 56(3); 2023
  • Article

Review

The Korean Society of Surface Science and Engineering 2023;56(3):208-218. Published online: Jun, 27, 2023

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Synthesis of Ag-doped black ZnO nano-catalysts for the utilization of visible-light

  • Ui-Jun Kima, Hye-Min Kimb, Seung-Hyo Leea,*
    aDivision of Ocean Advanced Materials Convergence Engineering, Korea Maritime & Ocean University, Busan 49112, Korea bDepartment of Materials Chemistry, Shinshu University, Nagano 380-8553, Japan
Abstract

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 selfcleaning 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.

Keywords Liquid phase plasma; Photocatalysts; Ag-doped black ZnO; Visible light; Methylene blue.