Synthesis of Nitrogen-Doped Carbon Dots from Nanocrystalline Cellulose by Pyrolysis Method as Hg2+ Detector

Abstract

The synthesis of modified carbon dots (N-CDs) from nanocrystalline cellulose, as the carbon source, with the combination of urea and ethylenediamine, as nitrogen dopant agents, was successfully carried out by pyrolysis at 300 °C. The N-CDs dispersed in both ethanol and distilled water generated bright blue fluorescent color under a UV lamp at 365 nm wavelength with a 29% quantum yield value. FTIR analysis confirmed that the surfaces of carbon dots were modified by amine and N-doped groups on the carbon ring structure and the data from the UV-VIS spectrum also showed that assumption. Produced N-CDs had a size distribution of 2-5 nm with an average diameter of around 3.4 nm. The ability of N-CDs as a detector was explored from the fluorescence quenching by Hg 2+ ions, in which it reached 40%. The determination of Hg 2+ could be completed in 10 min with a wide linearity range from 0-100 µM and a detection limit of 59 µM by the static quenching process.

Novel Multiphase CO2 Photocatalysis System Using N-TiO2/CNCs and CO2 Nanobubble

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“…CDs are quasispherical, submicron-sized nanoparticles. CDs have many unique advantages, including as high water solubility, robust cell permeability, sensitive surface modification, great photoluminescence capabilities, minimal toxicity, and an abundant supply of raw ingredients (Ghosal & Ghosh, 2019;Chung et al, 2020;Marpongahtun et al, 2023).…”