Structurally and Compositionally Tunable Absorption Properties of AgCl@AgAu Nanocatalysts for Plasmonic Photocatalytic Degradation of Environmental Pollutants
- Authors
- Ryu, Han-Jung; Kim, Ha-Lin; Joo, Jang Ho; Lee, Jae-Seung
- Issue Date
- 4월-2020
- Publisher
- MDPI
- Keywords
- AgCl; gold; silver; nanoparticle; surface plasmon resonance; photocatalyst; visible light; organic pollutant; PVP
- Citation
- CATALYSTS, v.10, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- CATALYSTS
- Volume
- 10
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56863
- DOI
- 10.3390/catal10040405
- ISSN
- 2073-4344
- Abstract
- Composite nanomaterials having Ag nanoparticles (NPs) that decorate nanostructured AgCl (Ag/AgCl) are promising as plasmonic photocatalysts because of the visible-light absorption of Ag NPs. However, the narrow absorption bands of Ag NPs near 400 nm cause inefficient absorption in the visible range and, consequently, unsatisfactory photocatalytic activity of Ag/AgCl nanomaterials. In this study, we introduce a new class of AgCl-based photocatalysts that are decorated with bimetallic Ag and Au NPs (AgCl@AgAu NPs) for visible-light-driven photocatalytic degradation of organic pollutants. Polyvinylpyrrolidone induces selective reduction of noble metal precursors on AgCl while leaving AgCl intact. The extended composition of the decorating NPs red-shifts the absorption band to 550-650 nm, which allows the catalysts to take advantage of more energy in the visible range for improved efficiency. Furthermore, we control the structures of the AgCl@AgAu NPs, and investigate their correlation with photocatalytic properties. The versatility, chemical stability, and practical application of the AgCl@AgAu NPs are demonstrated using various organic pollutants, recycling experiments, and natural aqueous media, respectively. Our fundamental investigation on the synthesis and applications of AgCl-based nano-photocatalysts is highly valuable for designing plasmonic photocatalysts and expanding their utilization.
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