Method for preparing water-soluble carbon quantum dots from sisal hemp as raw material

Abstract

The invention discloses a method for preparing water-soluble carbon quantum dots from sisal hemp as a raw material. The method comprises the following steps: 1) pretreating the sisal hemp; 2) mixing deionized water and glycerol in a volume ratio of (2-5): 1 to obtain a mixed solution for standby application; 3) adding the pre-treated sisal hemp to the mixed solution obtained in the step 2), stirring the mixture, and placing the mixture in a microwave environment for microwave processing to obtain a brown solution; 4) filtering the brown solution to obtain a filtrate; 5) dialyzing the filtrate; 6) evaporating a dialysate at constant temperature to obtain the water-soluble carbon quantum dots. The water-soluble carbon quantum dots are prepared with a microwave method directly, the carbon source is rich and cheap, recovery of waste is facilitated, the preparation process is simple, the whole preparation process is non-polluting, non-toxic, green and environment-friendly, and large-scale preparation can be realized.

Description

technical field [0001] The invention belongs to the technical field of fluorescent material preparation, and in particular relates to a preparation method of water-soluble carbon quantum dots using sisal as a raw material. Background technique [0002] In recent years, fluorescent carbon nanomaterials have attracted extensive research by researchers because of their good optical properties and low cytotoxicity. It has good photostability and no toxic side ions, is suitable for long-term detection and tracing experiments, and has broad application prospects in biomarkers and analysis and detection. Carbon quantum dots (CQDs) exhibit excellent properties such as hydrophilicity, low cytotoxicity, chemical and photostability, etc., which have attracted extensive attention and applications in the fields of chemistry, biomedicine, sensing and optoelectronics. [0003] There are currently two main methods for preparing carbon quantum dots: top-down method and bottom-up method. Th...

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Problems solved by technology

This method often requires strict experimental conditions and special energy sources, the cost is high, and the obtained carbon quantum yield is relatively low

Bottom-up synthesis method, that is, direct synthesis of fluorescent carbon quantum dots by pyrolysis or carbonization of suitable precursors, methods include: combustion method, hydrothermal carbonization method, ultrasonic method, etc., but these methods are often used Non-renewable energy and requires strict post-processing, so it is not conducive to continuous and large-scale production of fluorescent carbon quantum dots

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