Method for preparing water-soluble fluorescent carbon nanoparticle dots

Abstract

The invention provides a method for preparing water-soluble fluorescent carbon nanoparticle dots. The method is characterized by comprising the following steps: using a high temperature and high pressure hydrothermal method for treating pentosan which is obtained by using an alkaline process for extracting bleached broad leaf pulp and serves as a raw material, filtering so as to obtain a pale yellow liquid product and a dark brown solid product, wherein the solid product is used as a high-performance adsorbent for adsorption of heavy metal ions Pb (II) and Cd (II), centrifuging the pale yellow liquid product at a high speed, controlling centrifugal rotating speed and time, removing insoluble solids, removing components such as unreacted sugar and salts by using a dialysis bag, and concentrating so as to obtain the water-soluble fluorescent carbon nanoparticle dots. The operation technology has the main characteristics that the pentosan obtained by extracting pulping and papermaking byproducts is used as the raw material and is environmentally friendly, low in cost and easy to obtain, acid-base salts such as passivator do not need to be added during reaction, the product has good water solubility and fluorescent effect, the hydrothermal reaction process is simple to operate, and the cost is low.

Description

Technical field: [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for preparing water-soluble fluorescent carbon nanoparticle dots. Background technique: [0002] The annual output value of papermaking in the world reaches 400 million tons, and tens of thousands of adult wood are consumed every year, but the actual utilization rate is very low, and a large amount of raw materials become waste and are abandoned. As an important intermediate product in the papermaking process, bleached hardwood pulp has low cost and high yield, and it is rich in hemicellulose mixture, including ribose, xylose, arabinose, etc. In the actual production process, these pentosans are usually removed after treatment to further obtain high-quality paper, and the treated pentosans are directly discarded without further utilization, resulting in a large amount of waste. [0003] Fluorescent nanoparticles are widely used as metal probes, biomarkers, and l...

AI Technical Summary

Problems solved by technology

[0009] The Chinese patent with publication number CN102127431 introduces a method for preparing carbon quantum dots and a method for preparing photocatalysts using the quantum dots. In this method, ethanol and distilled water are combined After mixing in a certain volume ratio, add an inorganic strong base to obtain an electrolyte and put it into an electrolytic cell, use a graphite carbon rod as an electrode, and perform an electrochemical reaction at a current density of 10-200mA / cm2 for 2-4 hours. Finally, a desiccant is added to obtain carbon quantum dots through column chromatography separation. This method is performed in two steps, one electrolysis and one column chromatography separation. The reaction is complicated and the damage to the instrument is great.

Images