Biomass-derived carbon quantum dot: “On–off-on” fluorescent sensor for rapid detection of multi-metal ions and green photocatalytic CO2 reduction in water

Tools

Sebastian, Raja, da Silva, Gelson T. S. T., Sellamuthu Kooduthurai, Anbu ORCID: https://orcid.org/0000-0002-7176-330X, Ribeiro, Caue and Mattoso, Luiz H. C. (2023) Biomass-derived carbon quantum dot: “On–off-on” fluorescent sensor for rapid detection of multi-metal ions and green photocatalytic CO2 reduction in water. Biomass Conversion and Biorefinery. ISSN 2190-6815

[thumbnail of AcceptedManuscript] PDF (AcceptedManuscript) - Accepted Version
Restricted to Repository staff only until 2 May 2024.
Request a copy

Abstract

We have developed carbon quantum dots (CQDs) with excellent photoluminescence (PL) properties from macaúba (Acrocomia aculeate) fibers; a widely available cellulosic biomass species of palm trees in South America. As-prepared CQDs showed quasi-spherical morphology with high aqueous solubility and strong excitation-dependent fluorescence behaviour. Interestingly, the CQDs display fluorescence 'turn-off' response with excellent sensitivity toward multi-metal ions including Fe3+, Cu2+ and Hg2+ with very low detection limits of 0.69 μM, 0.99 μM, 0.25 μM, respectively. Notably, ascorbic acid (AA) induced a change in the (turn-off) fluorescence of Fe3+-CQDs, which caused an almost 70% revival of fluorescence (turn-on) by displacing Fe3+ ions. We have also harnessed CQDs as the visible-light-induced photocatalyst to reduce CO2 in water. Especially, the CQDs efficiently promote the photocatalytic reduction of CO2 into methane (CH4) with an evolution rate of 99.8 nmol/g at 436 nm in aqueous conditions. This indicates that the CQDs provide abundant active sites for CO2 adsorption and thus enhance the separation and migration of photo-induced charge carriers that efficiently reduce CO2 into CH4 without any cocatalyst in 100% water.

Item Type: Article
Additional Information: Funding information: The authors thank CAPES (Proc. No. 88887.575987/2020-00) and FAPESP (Proc. No. 2015/00094-0; Proc. No. 2017/22017-3) for financial support. S. Anbu gratefully acknowledges the Depts. of Chemistry and Biomedical Sciences, University of Hull, UK and RSC for the award of Research Fund grant (RF19-7464). The authors thank FAPESP (Proc. No. 2018/01258-5) for financial support. The authors also thank the Center for the Development of Functional Materials – CDMF / Sao Paulo Research Foundation – FAPESP (Proc. No. 2013/07296-2).
Uncontrolled Keywords: carbon quantum dots,macaúba,metal ion detection,on–off-on,photocatalytic co reduction,visible-light,renewable energy, sustainability and the environment ,/dk/atira/pure/subjectarea/asjc/2100/2105
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 28 Apr 2023 09:30
Last Modified: 30 Jan 2024 03:36
URI: https://ueaeprints.uea.ac.uk/id/eprint/91900
DOI: 10.1007/s13399-023-04247-0

Actions (login required)

View Item View Item