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Preparation of sulfur-doped carbon quantum dots from lignin as a sensor to detect Sudan I in an acidic environment.
- Source :
-
Journal of materials chemistry. B [J Mater Chem B] 2020 Dec 21; Vol. 8 (47), pp. 10788-10796. Date of Electronic Publication: 2020 Nov 06. - Publication Year :
- 2020
-
Abstract
- To achieve a rapid and facile quantitative evaluation of Sudan I illegally added in ketchup, fluorescent carbon quantum dots with excellent stability in acidic environments are required as the actual pH value of ketchup is close to 4.0. In this paper, we developed a green approach to prepare sulfur-doped carbon quantum dots (SCQDs) via hydrothermal treatment of lignin, isolated from pre-hydrolysis liquor, in sulfuric acid solution. The resultant SCQDs from lignin possessed sulfur-containing groups, which exhibited excellent fluorescence with a quantum yield up to 13.5% and good stability in acidic environments with a wide pH range of 0-5.0. Therefore, the SCQDs were successfully employed as a sensor to detect Sudan I in acidic solutions with excellent selectivity and sensitivity. The linear range for Sudan I was 0-40 μM, while the limit of detection was 0.12 μM. In addition, the fluorescent indicator paper functionalized with SCQDs also showed outstanding selectivity to Sudan I. The proposed SCQD sensing system not only displayed application potential for quantitative evaluation of Sudan I dye in practical samples, but also provided a way to convert lignin-based waste into highly valued nanoscale materials.
- Subjects :
- Carbon analysis
Fluorescent Dyes analysis
Hydrogen-Ion Concentration
Lignin analysis
Limit of Detection
Naphthols analysis
Quantum Dots analysis
Spectroscopy, Fourier Transform Infrared methods
Sulfur analysis
Sulfur chemistry
Sulfuric Acids analysis
Carbon chemistry
Fluorescent Dyes chemical synthesis
Lignin chemical synthesis
Naphthols chemical synthesis
Quantum Dots chemistry
Sulfuric Acids chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 2050-7518
- Volume :
- 8
- Issue :
- 47
- Database :
- MEDLINE
- Journal :
- Journal of materials chemistry. B
- Publication Type :
- Academic Journal
- Accession number :
- 33156321
- Full Text :
- https://doi.org/10.1039/d0tb00125b