TY - JOUR
T1 - Biomass-derived carbon quantum dot: “On–off-on” fluorescent sensor for rapid detection of multi-metal ions and green photocatalytic CO2 reduction in water
AU - Sebastian, Raja
AU - da Silva, Gelson T. S. T.
AU - Sellamuthu Kooduthurai, Anbu
AU - Ribeiro, Caue
AU - Mattoso, Luiz H. C.
N1 - 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).
PY - 2023/5/2
Y1 - 2023/5/2
N2 - 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.
AB - 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.
KW - Carbon quantum dots
KW - Macaúba
KW - Metal ion detection
KW - On–off-on
KW - Photocatalytic CO reduction
KW - Visible-light
UR - http://www.scopus.com/inward/record.url?scp=85154549971&partnerID=8YFLogxK
U2 - 10.1007/s13399-023-04247-0
DO - 10.1007/s13399-023-04247-0
M3 - Article
JO - Biomass Conversion and Biorefinery
JF - Biomass Conversion and Biorefinery
SN - 2190-6815
ER -