Silicon carbide nano tube as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of nano material preparation and discloses a silicon carbide nano tube as well as a preparation method and application thereof. The method comprises the following steps: (1) dispersing carbon nano tubes into mixed acid of concentrated nitric acid and concentrated sulfuric acid, performing ultrasonic treatment, then stirring under room temperature, centrifuging, using water to clean obtained precipitate and drying to obtain pretreated carbon nano tubes; (2) evenly grinding silicon powder and the pretreated carbon nano tubes, putting into a tube furnace to perform warming reaction and purifying a reaction product to obtain a target product silicon carbide nano tube after reaction is finished. According to the silicon carbide nano tube disclosed bythe invention, the carbon nano tubes are treated by mixed acid to remove metal impurities and amorphous carbon in the carbon nano tubes; thus, the silicon carbide nano tube disclosed by the inventioncan be generated according to the V-S reaction mechanism; the SiC nano tube is of a one-dimensional conductive network structure, can promote separation of light induced electrons and cavities and can improve the photoelectrocatalysis efficiency; the SiC nano tube material has excellent photoelectrocatalysis performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a silicon carbide nanotube and its preparation method and application. Background technique [0002] Cubic phase SiC is a very important non-metal oxide semiconductor. Its bandgap is about 2.4eV, its conduction band potential is relatively negative, and it has high thermal conductivity. It can decompose water to produce hydrogen under the irradiation of visible light. Moreover, SiC is very rich in raw materials and environmentally friendly, which makes it more promising for large-scale applications. However, because SiC is prone to self-photocorrosion and its own fast electron-hole velocity, the photocatalytic efficiency of SiC has not been high, and there are still few reports on the photocatalytic water splitting of SiC powder. Scientists have proposed various approaches to improve the photocatalytic efficiency of SiC. One of the effective mitigation approach...

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Problems solved by technology

[0003] Therefore, the present invention uses carbon nanotubes as a template and a carbon source, sublimates silicon powder at high temperature under an argon atmosphere to obtain silicon vapor, and reacts silicon vapor with carbon nanotubes to obtain silicon carbide nanotubes, which are used as catalysts for photocatalytic decomposition of water to produce hydrogen Not yet reported

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