Nitrogen doped fluorescent carbon quantum dot and preparation method thereof

Abstract

The invention belongs to the technical field of nano material preparation and metal ion detection, and particularly relates to a nitrogen doped fluorescent carbon quantum dot and a preparation methodthereof. The preparation method for the nitrogen doped fluorescent carbon quantum dot comprises the following steps: preparing a mixed solution of carboxymethyl cellulose and ethanediamine; putting the mixed solution in a high-pressure reaction kettle to perform hydrothermal reaction to obtain a reaction solution; performing ultrasonic treatment on the reaction solution, centrifuging, and filtering to obtain filtrate; using super-pure water to perform dialysis treatment on filtrate, and freezing and drying a solid product obtained by dialysis to obtain powder, thereby obtaining the nitrogen doped fluorescent carbon quantum dot. The method is simple in preparation process, is green and environmentally friendly, is low in cost, is simple in equipment and is suitable for large-scale production; and the prepared carbon quantum dot has excellent performances of being good in water solubility, stable in fluorescence property, uniform in grain size, non-toxic and harmless, biocompatible and the like, so that the application field of the carbon quantum dot is expanded.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation and metal ion detection, and in particular relates to a nitrogen-doped fluorescent carbon quantum dot and a preparation method thereof. Background technique [0002] In recent years, carbon quantum dots have attracted great attention from researchers due to their advantages such as low toxicity, good biocompatibility, stable optical properties, and easy surface functionalization. and other fields are considered to be the most promising new carbon nanomaterials. At present, the preparation methods of carbon quantum dots usually include electrochemical synthesis method, chemical oxidation method, combustion method, hydrothermal synthesis method, template method, microwave synthesis method, etc. Among them, compared with other synthesis methods, hydrothermal synthesis method is more expensive than other synthetic methods. The steps are simple, the reaction conditions are relat...

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Problems solved by technology

The invention overcomes the disadvantages of expensive raw material cost and complicated follow-up treatment, fully considers economic and environmental protection, adopts natural non-toxic, cheap and easy to obtain and biodegradable carboxymethyl cellulose as the precursor, and ethylenediamine as the nitrogen source doping agent; using a one-step hydrothermal method that is environmentally friendly, simple to operate, and requires little experimental equipment to prepare nitrogen-doped fluorescent carbon quantum dots with high fluorescence intensity and low toxicity, and has been successfully applied to Fe 3+ detection

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