Publication: Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples
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Issued Date
2020
Resource Type
File Type
application/pdf
ISSN
20462069
Other identifier(s)
2-s2.0-85086469820
Rights Holder(s)
Scopus
Bibliographic Citation
RSC Advances. Vol 10, No.35 (2020), p.20638-20645
Suggested Citation
Sakaew C., Sricharoen P., Limchoowong N., Nuengmatcha P., Kukusamude C., Kongsri S., Chanthai S. Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples. RSC Advances. Vol 10, No.35 (2020), p.20638-20645. doi:10.1039/d0ra03101a Retrieved from: https://hdl.handle.net/20.500.14740/4529
Abstract
Self-functionalized carbon dots (CDs) were prepared from ethanolic shallot extract to obtain a total phenolic precursor. The total phenolic extract was then heated at 180 °C for four hours in an autoclave. Only 1 mg L−1of CDs had high fluorescence emission at 430 nm after excitation at 340 nm and manifested a high selectivity for Cr(vi) ions. The inter- and intra-day emission stability, pH, ionic strength, solvent effect, Stern-Volmer constant, incubation time, speciation of Cr(iii) and Cr(vi) ions, and ion selectivity of the as-prepared CDs were investigated in detail. The proposed method was validated in 20-100 μM linearity withy= 2.2346xas the set-zero intercept linear equation, 0.9981 as the correlation coefficient, 3.5 μM as the limit of detection (LOD), 11.7 μM as the limit of quantification (LOQ), and 2.78% and 5.29% as the intra-day and inter-day relative standard deviations (RSD), respectively. The recovery of drinking water, milk, soymilk, fruit juices (apple and coconut), tap water, and chromium-coated industrial waste water by the investigated Cr sensor was found to be 78.58-119.69%. Therefore, the proposed Cr(vi) sensor had superior advantages of sensitivity, selectivity, rapidity, and reproducibility. © The Royal Society of Chemistry 2020.
Subject(s)
Carbon
Dairies
Fruit juices
Fruits
Ionic strength
Metal coatings
Metal ions
Metal recovery
Potable water
Solvents
Correlation coefficient
Emission stability
Fluorescence emission
Limit of quantifications
Relative standard deviations
Stern-Volmer constants
Wastewater samples
Water-soluble carbons
Chromium compounds
Dairies
Fruit juices
Fruits
Ionic strength
Metal coatings
Metal ions
Metal recovery
Potable water
Solvents
Correlation coefficient
Emission stability
Fluorescence emission
Limit of quantifications
Relative standard deviations
Stern-Volmer constants
Wastewater samples
Water-soluble carbons
Chromium compounds