[논문]가시광선 활용을 위한 Ag 도핑 흑색 ZnO 나노 광촉매 합성

김의준; 김혜민; 이승효

doi:10.5695/jsse.2023.56.3.208

가시광선 활용을 위한 Ag 도핑 흑색 ZnO 나노 광촉매 합성
Synthesis of Ag-doped black ZnO nano-catalysts for the utilization of visible-light 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.56 no.3, 2023년, pp.208 - 218

김의준 (한국해양대학교 해양신소재융합공학과) , 김혜민 (신슈대학 물질화학과) , 이승효 (한국해양대학교 해양신소재융합공학과)

Abstract ▼ AI-Helper

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.

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표/그림 (12)

그림 Fig. 1. Schematic and image of experimental apparatus and reaction field of liquid phase plasma.
표 Table 1. Physical properties of Zn and Ag electrode in liquid phase plasma process
그림 Fig. 3. Digital images, SEM/EDS images and chemical compositions of (a) BL-ZnO and (b) Ag/BL-ZnO.
그림 Fig. 2. (a) Schematic of experimental setup used for photocatalytic degradation of MB and (b) optical emission spectrum of LED light used in photocatalytic activity test.
그림 Fig. 4. The XRD pattern of (a) BL-ZnO and (b) Ag/BL-ZnO.
그림 Fig. 5. (a) The complete XPS survey spectra of BL-ZnO and Ag/BL-ZnO, and the corresponding high-resolution XPS spectra of (b) Zn, (c) O, and (d) Ag.
그림 Fig. 6. UV/Vis absorption spectra of BL-ZnO and Ag/BL-ZnO.
그림 Fig. 7. Photoluminescence spectra of BL-ZnO and Ag/BL-ZnO.
그림 Fig. 8. Active species during the synthesis of BL-ZnO and Ag/BL-ZnO (inset graph).
그림 Fig. 9. FT-IR spectra of BL-ZnO and Ag/BL-ZnO.
그림 Fig. 10. Effect of photocatalysts amount on photocatalytic degradation at solution pH 11
그림 Fig. 11. Effect of solution pH on photocatalytic degradation with 0.6 g/L of (a) BL-ZnO and (b) Ag/BL-ZnO.

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