Method for preparing silicon carbide nanoparticles by use of agricultural waste biomass

Abstract

The invention discloses a method for preparing silicon carbide nanoparticles by use of agricultural waste biomass. The method comprises the following steps: dissolving 1.5g of cobalt nitrate in 100ml of absolute ethyl alcohol and adding 50ml of tetraethylortho silicate after the cobalt nitrate is completely dissolved; under powerful stirring, adding 8ml of oxalic acid liquid; thoroughly stirring for 24 hours and then adding 36g of corn bract powder, mixing evenly, and then adding 8ml of hexamethylenetetramine; drying the obtained solidified sol in a drying oven at 100 DEG C; putting the dry xerogel into a high-temperature tubular furnace, and under the protection of an argon atmosphere, increasing the temperature from a room temperature to 1000 DEG C at the temperature rise rate of 10 DEG C per minute firstly, and then increasing the temperature to 1300 DEG C by 2 DEG C per minute and keeping the temperature constant for 7 hours; and after the temperature is reduced to the room temperature by cooling, taking out the sample, calcining the sample in air at 700 DEG C for 3 hours, cleaning the product by use of hydrochloric acid and hydrofluoric acid, and finally, washing, filtering and drying to obtain the final product, namely the silicon carbide nanoparticles. The method for preparing the silicon carbide nanoparticles by use of the agricultural waste biomass is capable of realizing large-scale preparation of evenly distributed small-size silicon carbide nanoparticles by use of a simple process.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and specifically relates to a method for preparing silicon carbide nanoparticles from agricultural waste biomass. Background technique [0002] Silicon carbide nanomaterials not only have good mechanical properties, but also have excellent photoelectric properties, chemical inertness and biocompatibility, etc., so they have broad application prospects in optical devices, biomedicine, nanoelectronics and composite materials [2,3 ]. Silicon carbide nanoparticles have large surface area, small particle size, and excellent mechanical and photoelectric properties, so they are often used in high-frequency, high-power, and harsh environments. Therefore, it is very important to develop an inexpensive technology to prepare small-sized and uniformly distributed SiC nanoparticles. [0003] At present, the main methods for preparing silicon carbide nanomaterials are: chemical vapor deposition method, arc...

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Problems solved by technology

[0003] At present, the main methods for preparing silicon carbide nanomaterials are: chemical vapor deposition method, arc discharge method, heating evaporation method, sol-gel and carbothermal reduction method, etc. The main disadvantages of these technologies are that the raw materials are expensive, the process is complicated, and the equipment Complicated etc.