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- 저자 : Juan Zhang(장쥐안) (검색결과 2 건)
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Aerosol Processing and Photocatalytic Degradation of Ag-TiO₂ Composite Nanoparticles
Juan Zhang(장쥐안),Soo Hyung Kim(김수형) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
This study reports the gas-phase synthesis and characterization of Ag-TiO<sub>2</sub> composite nanoparticles (NPs), and their applications into photo-degradation of organic materials (e.g., methylene blue) under the irradiation of UV and visible light. The effects of surface plasmon resonance (SPR) and electron sink of Ag-TiO<sub>2</sub> composite NPs were made for photo-degradation of organic materials-based solution. Ag-TiO<sub>2</sub> composites NPs with different amounts of Ag(i.e., 0.5, 1. 2 and 5wt%) prepared by spray pyrolysis method using the mixture of TiO<sub>2</sub> and AgNO<sub>3</sub> as precursor solutions. All prepared photocatalysts were characterized using various technics, including crystalline phase, morphology, chemical composition, and optical property measurements. It was clearly observed that the optimized amount of Ag (i.e., 1 wt%) in the TiO<sub>2</sub> matrix confirmed that the optical excitation was successfully driven by visible light irradiation. This noteworthy enhancement was ascribed to the local SPR, which enabled Ag-TiO<sub>2</sub> composite NPs to optically absorb the visible light spectrum. Under the visible light irradiation test conditions for the various MB solutions dispersed with Ag-TiO<sub>2</sub> composite NPs, the rate constant(k) of first-order reaction that characterizes the photocatalytic reactivity values were observed to be ~ 0.232 h<sup>-1</sup> for pure TiO<sub>2</sub> and ~0.396 h<sup>-1</sup> for Ag (1 wt%)-TiO<sub>2</sub>, respectively. The Ag (1 wt%)-TiO<sub>2</sub> composite NPs under visible light irradiation showed 70% increase in photocatalytic reactivity compared with pure TiO<sub>2</sub>. In addition, the prepared Ag-TiO<sub>2</sub> composite NPs had the excellent photocatalytic activity under UV light irradiation because metallic Ag can act as an electron trap to inhibit electron-hole recombination. Similarly, under the UV light irradiation test conditions for the various MB solutions dispersed with Ag-TiO<sub>2</sub> composite NPs, the k values were observed to be ~0.260 h<sup>-1</sup> for pure TiO<sub>2</sub> and ~0.424 h<sup>-1</sup> for Ag (1 wt%)-TiO<sub>2</sub>, respectively. The Ag (1 wt%)-TiO<sub>2</sub> composite NPs under UV light irradiation showed 63% increase in photocatalytic reactivity compared with pure TiO<sub>2</sub>
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