Alkali lignin carbon nanometer microsphere as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of carbon nanometer materials, and discloses an alkali lignin carbon nanometer sphere, a preparation method and an application thereof. The preparation method is as follows: using N, N-dimethylformamide or glacial acetic acid as a solvent, configuring an alkali lignin electrostatic spray solution with a mass fraction of 20% to 50%, and then transferring it to an electrostatic spraying device , the alkali lignin nanospheres are obtained by electrostatic spraying, and then the alkali lignin nanospheres are pre-oxidized at a temperature of 250-280°C, and finally carbonized at a temperature of 400-900°C to obtain alkali lignin carbon nanospheres. The invention uses low-cost, renewable and degradable commercial alkali lignin as a carbon source, and has the advantages of energy saving and environmental protection. The obtained alkali lignin carbon nano-microspheres have good microscopic appearance and good dispersion performance, which improves the use performance of the lignin carbon material.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, and in particular relates to an alkali lignin carbon nanosphere and its preparation method and application. Background technique [0002] With the increasing energy and environmental problems, how to make more effective and full use of natural, renewable and environmentally friendly biomass resources has received widespread attention from the society. [0003] As one of the most widely existing resources in nature, lignin is the second largest amorphous polyphenolic polymer in the plant kingdom after cellulose. It is a renewable, green and environmentally friendly natural polymer material. As a by-product of the paper industry, commercial lignin exists in the paper black liquor and is rarely further processed and utilized, resulting in waste of resources and even environmental problems. Carbon materials exhibit excellent properties in terms of hardness, optical properties, heat res...

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Problems solved by technology

The most used carbon fiber material is polyacrylonitrile-based carbon fiber, but this carbon fiber is a petrochemical fiber, which has the problems of non-renewability, poor environmental protection and high cost

However, the use of single lignin to prepare carbon fiber materials has the problem of low fiber strength. The preparation of carbon materials by combining lignin and synthetic polymers is one of the main methods used by researchers.

At present, there are few domestic and foreign studies on the preparation of carbon nanospheres using simple lignin as a carbon source. The main problem is that it is difficult to maintain the microscopic morphology of carbon materials prepared from single lignin, which limits its further use. , the present invention aims to solve the problem that nanostructures are easily damaged in the processing of carbon materials, and accelerate the industrialization of lignin carbon materials

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