Magnetic sulphonated carbon-based nanofiber, preparation method for same and application thereof

Abstract

The invention relates to the field of inorganic nonmetal materials, in particular to a magnetic sulphonated carbon-based nanofiber, a preparation method for same and application thereof. Glucose and ferric nitrate are proportionally mixed and dissolved and chemically react to prepare precursor sol, the precursor sol is subjected to decompression dehydration to obtain precursor gel with certain viscosity, the precursor gel is spun into gel cellulose fibers, the obtained gel cellulose fibers are incompletely carbonized at 350-400 DEG C in the presence of N2, and then 95% concentrated sulfuric acid 200ml is added to the carbonized gel cellulose fibers for sulphonating at 80-100 DEG C for 8 hours. Initially, the magnetic sulphonated carbon-based nanofiber with uniform diameter, large specific surface area, larger length-diameter ratio and high magnetism is prepared from the glucose and the ferric salt by means of organic gel precursor conversion and under actions of incomplete carbonization and sulphonation, and is highly active when used for catalyzing conversion of high-acid grease into biodiesel. Recycling the nanofiber is possible due to a certain magnetism of the nanofiber.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a magnetic sulfonated carbon-based nano hollow fiber and its preparation method and application. Background technique [0002] With the depletion of petroleum resources, the supply of petrochemical diesel is becoming increasingly tight. Biodiesel is expected to replace petrochemical diesel fuel and meet people's needs because of its environmental friendliness and renewable. Various oils and methanol or ethanol are used as raw materials, and are obtained through transesterification reactions with acids, alkalis, enzymes, etc. as catalysts or under supercritical conditions. [0003] Generally, basic catalysts such as sodium hydroxide and potassium hydroxide are mostly used in industrial biodiesel production, but the use of basic catalysts has very strict requirements on raw oils and fats. Not more than 0.1-0.3% (moisture in raw materials will promote the hydrolysis ...

AI Technical Summary

Problems solved by technology

[0004] The solid acid catalyzed transesterification process not only avoids serious problems such as difficult catalyst separation, excessive waste liquid, and strong corrosion in the reaction, but also has the advantages of mild reaction conditions, reusable catalysts, easy automatic continuous production, and no pollution to the environment. At present, the commonly used solid acid catalysts in the preparation of biodiesel include: zeolite molecular sieves, heteropolyacids, ion exchange resins and solid superacids, etc., but these solid acid catalysts have high preparation costs, low catalytic activity, and stability during use. It is difficult to realize industrial application due to a series of problems such as poor performance and poor reusability. Therefore, the research and development of cheap, efficient and stable solid acid catalysts is very important for the development of biodiesel industry.

Images