Shape-engineered carbon quantum dots embedded on CdS-nanorods for enhanced visible light harvesting towards photocatalytic application
- Authors
- Moniruzzaman, M.; Kim, Jongsung
- Issue Date
- 30-Jun-2021
- Publisher
- ELSEVIER
- Keywords
- CdS nanorods; Nanocomposites; Photocatalysis; Specific-shaped (quadrilateral and trilateral) CQDs; Yellow emission
- Citation
- Applied Surface Science, v.552
- Journal Title
- Applied Surface Science
- Volume
- 552
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/81517
- DOI
- 10.1016/j.apsusc.2021.149372
- ISSN
- 0169-4332
- Abstract
- Shape-engineered yellow-emissive carbon quantum dots (Y-CQDs) with discernible edges were synthesized. Three-fold-symmetric benzene-1,3,5-triol was a suitable precursor for controlling the specific structure and shape of CQDs via dehydration-facilitated covalent polymerization in sulfuric acid within 90 min of a thermal reaction at 190 °C. The formation mechanism involves ring cyclization of benzene-1,3,5-triol via a six-membered fashion through elimination of the neighboring active -H and –OH groups. Binary heterostructure nanocomposites, comprising CdS-nanorods (NRs) and Y-CQDs, were prepared using simple sonication followed by solvent evaporation under stirring. The nanocomposite with 6 wt% YCQDs (CdS@Y-CQDs-6) exhibited the highest enhanced photocatalytic degradation of rhodamine B (RhB) with a degradation efficiency of 98% within 45 min, and the degradation rate constant was ~4.8 times higher than that of pristine CdS-NRs under visible light irradiation. The degradation of RhB is carried out through the formation of a green emissive intermediate N-deethylated RhB. The improved photocatalytic degradation performance of CdS@Y-CQDs nanocomposites is attributed to the formation of near-surface heterojunction of surface-adsorbed specific-shaped Y-CQDs, which can widen the range of light absorption and promote the separation of photogenerated electron-hole pairs in CdS-NRs by trapping and boosting the transfer of photo excited charge carriers over the surface. © 2021
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