A zero-dimensional/two-dimensional Ag-Ag2S-CdS plasmonic nanohybrid for rapid photodegradation of organic pollutant by solar light
- Authors
- Lee, Jin Hyeok; Lee, Yechan; Bathula, C.; Kadam, A.N.; Lee, Sang-Wha
- Issue Date
- Jun-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Cadmium sulfide nanosheets; Photocatalysis; Photochemical; Silver deposition; Zero-dimensional/two-dimensional
- Citation
- Chemosphere, v.296
- Journal Title
- Chemosphere
- Volume
- 296
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83743
- DOI
- 10.1016/j.chemosphere.2022.133973
- ISSN
- 0045-6535
- Abstract
- Herein, the two synthesis strategies are employed for rational design of 0D/2DAg-Ag2S–CdS heterojunctions towards photocatalytic degradation of methyl orange (MO) under simulated solar light. As the first strategy, a ternary Ag–Ag2S–CdS nanosheet (NS) heterojunction was fabricated via combined cation exchange and photo-reduction (CEPR) method (Ag–Ag2S–CdS/CEPR). The second strategy employed coprecipitation (CP) method (Ag–Ag2S–CdS/CP). Strikingly, SEM, TEM and HR-TEM images are manifested the first strategy is beneficial for retaining the original thickness (20.2 nm) of CdS NSs with a dominant formation of metallic Ag, whereas the second strategy increases the thickness (33.4 nm) of CdS NSs with a dominant formation of Ag2S. The Ag–Ag2S–CdS/CEPR exhibited 1.8-fold and 3.5-fold enhancement in photocatalytic activities as compared to those of Ag–Ag2S–CdS/CP and bare CdS NSs, respectively. This enhanced photocatalytic activity could be ascribed to fact that the first strategy produces a high-quality interface with intimate contact between the Ag–Ag2S–CdS heterojunctions, resulting in enhanced separation of photo-excited charge carriers, extended light absorption, and enriched active-sites. Furthermore, the degradation efficiency of Ag–Ag2S–CdS/CEPR was significantly reduced to ∼5% in the presence of BQ (•O2− scavenger), indicating that •O2− is the major active species that can decompose MO dye under simulated solar light. © 2022 Elsevier Ltd
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