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Experimental and computational studies of sonochemical assisted anchoring of carbon quantum dots on reduced graphene oxide sheets towards the photocatalytic activity

Ashritha, M.G., Rondiya, Sachin R., Cross, Russell W., Dzade, Nelson Y., Dhole, S.D., Hareesh, K. and Sunitha, D.V. 2021. Experimental and computational studies of sonochemical assisted anchoring of carbon quantum dots on reduced graphene oxide sheets towards the photocatalytic activity. Applied Surface Science 545 , 148962. 10.1016/j.apsusc.2021.148962

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Abstract

Herein, carbon quantum dots (CQDs) are anchored on reduced graphene oxide (rGO) sheets by sonochemical assisted method. The developed carbon quantum dots/reduced graphene oxide (CQDs/rGO) catalyst shows enhancement in the photocatalytic degradation of methylene blue and methyl orange under visible light compared to that of individual CQDs and rGO components. The improved performance of the CQDs/rGO catalyst has been attributed to efficient separation of photogenerated charge carriers as studied by photoluminescence studies and to increase in the surface area as studied by Brunauer-Emmett-Teller method. The photocatalytic degradation is studied in detail by varying catalyst loading, dye concentration and the rate constant is determined by first order kinetics. The enhancement in photocatalytic activity of CQDs/rGO catalyst is validated by first principles density functional theory (DFT) calculations which shows the enrichment in density of states thereby decreasing the work function.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Elsevier
ISSN: 0169-4332
Funders: EPSRC
Date of First Compliant Deposit: 28 January 2021
Date of Acceptance: 5 January 2021
Last Modified: 18 Mar 2021 11:31
URI: http://orca.cardiff.ac.uk/id/eprint/138046

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