Effect of Urea and Chitosan Doping on Red Bean Carbon Dots as Heavy Metal Detectors

• Published in: Journal of physics. Conference series Vol. 2672; no. 1; pp. 12016 - 12022
• Main Authors: Sinuhaji, Perdinan, Syahri, Alfi
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.12.2023
• Subjects: Absorbance; Beans; Carbon; Carbon dots; Chitosan; Heavy metals; Microstructure; Physics; Ureas; Wavelengths
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2672/1/012016

Abstract The synthesis of red bean carbon dots doped with urea and chitosan has been successfully carried out using the bottom-up method via hydrothermal technique at 200°C for 4 hours. UV-VIS characterization showed that Carbon Dots : Red Beans + NaOH had an absorbance value of 2.55, Carbon Dots : Red Beans + NaOH + Urea had an absorbance value of 1.55, while Carbon Dots :Red Beans + Urea + Chitosan had an absorbance value of 2.66. FTIR characterization shows that the Carbon Dots do not change in spectral wave number with wave numbers 3265 cm - 1 to 1021 cm - 1 . Microstructure of Red Beans + NaOH Carbon Dots has a spherical microstructure with a diameter of between 7-12 nm, and Red Beans + NaOH + Urea Carbon Dots has a cubical microstructure. Meanwhile, Carbon Dots from Red Beans + Urea + Chitosan have a spherical microstructure with a diameter of 6 - 9 nm. The EDX characterization shows that the Carbon Dots sample contains the elements C, O, K, Cl, Na.