A novel approach to Hg2+ determination in water samples using carbon dots based on paper and fluorescence digital image analysis

BACKGROUND This work proposes the use of a simple, inexpensive method for the hydrothermal synthesis of fluorescent carbon dot nanoparticles (CDs) from rice starch aimed at the determination of Hg2+ in water. The proposed method involved using a paper‐based analytical device coupled to a 3D plate, w...

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Published in:Journal of chemical technology and biotechnology (1986) 2024-05, Vol.99 (5), p.1157-1164
Main Authors: Maia, Matheus Valentin, Suarez, Willian Toito, Santos, Vagner Bezerra, Oliveira, Severino Carlos Bezerra, Almeida, João Paulo Barbosa
Format: Article
Language:English
Subjects:
biomass
Carbon
Carbon dots
Confidence intervals
Digital imaging
environmental chemistry
Fluorescence
Green chemistry
heavy metals
Image acquisition
Image analysis
Image processing
Mercury (metal)
Nanoparticles
Reagents
Starch
Synthesis
water
Water analysis
Water sampling
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Summary:BACKGROUND This work proposes the use of a simple, inexpensive method for the hydrothermal synthesis of fluorescent carbon dot nanoparticles (CDs) from rice starch aimed at the determination of Hg2+ in water. The proposed method involved using a paper‐based analytical device coupled to a 3D plate, with a UV‐LED chamber and a smartphone for the acquisition and analysis of the fluorescence digital images of the CDs. RESULTS The size of the carbon dots ranged from 0.5 to 3 nm, with an average particle size of ~1 nm. The functionalization of carbon dots with methimazole allowed a high selective for Hg2+ determination. The results obtained showed a linear response R2 of 0.997 and Hg2+ concentration in the range of 0.5–45.0 μmol L−1 with a limit of detection and limit of quantitation of 0.23 and 0.62 μmol L−1, respectively. The results of the study show that there were no significant differences, at 95% confidence level, between the data obtained from the application of the proposed method and the reference method. CONCLUSION The proposed method is in line with the principles of green chemistry, as it involves the use of renewable sources for starch extraction and a hydrothermal synthesis process that does not employ toxic reagents. In addition, the method employs only 15 μL reagent/sample. © 2024 Society of Chemical Industry (SCI).
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.7618