Facile green preparation of highly fluorescent nitrogen-doped carbon dots from bagasse for sensitive methyl parathion
Ji Ma1, Guoxia Huang1, Jie Li1
1Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, PR China.
Abstract:
In this work, a high sensitivity fluorescence sensor system utilizing nitrogen-doped carbon dots (N-CDs) from bagasse was studied. A method was developed to examine methyl parathion (MP) via alkali hydrolysis. N-CDs were prepared via hydrothermal method from biomass bagasse. The maximum excitation band of the N-CDs was 370 nm, and the fluorescence quantum yield was 32.6 %. In a strong alkaline environment, the MP is hydrolyzed into p-nitrophenol via electrostatic interactions between inner filtration effect and molecules, which can inhibit the fluorescence of the N-CDs. The established MP-N-CD system has good linearity, with 0.005-10.0 μg·mL-1 bound and a detection limit of 0.83 ng·mL-1. Then a fluorescence sensing system was used to detect MP in vegetable and fruit samples. The recoveries were between 98.2 % and 101.9 %, and relative standard deviation decreased to 3.6 %. The proposed method is green, simple, cost-effective, highly sensitive, and highly selective.
