acfs@tic/tio 2 Composite materials and their preparation methods and applications

Abstract

The invention discloses a CFs@TiC / TiO 2 Composite material and its preparation method and application, said CFs@TiC / TiO 2 The preparation process of composite materials is as follows: (1) carbon fiber (CFs) is used as carbon raw material, and carbon fiber is degummed by Soxhlet extraction method to obtain single dispersed fiber; (2) titanium hydride is used as titanium molten salt method in Porous titanium carbide grown on the surface of carbon fiber; (3) using potassium hydroxide hydrothermal method to partially convert the titanium carbide grown on the surface of carbon fiber into potassium titanate nanosheets; (4) after acid treatment and heat treatment, CFs@TiC / TiO 2 Composite functional materials. The invention has simple process, easy adjustment and control of material structure, excellent performance of the prepared composite material, and is convenient for industrial production and engineering application.

Description

technical field [0001] The invention relates to a CFs@TiC / TiO 2 The composite material and its preparation method and application belong to the technical field of composite material preparation. Background technique [0002] Carbon fiber is expected to become a good catalyst support material, which is due to its good chemical stability and excellent mechanical properties. Good chemical stability allows it to be used for a long time in relatively extreme chemical environments such as acid, alkali and salt, and good mechanical properties and flexibility allow it to better support catalysts. However, the inertness of the carbon fiber surface limits its application, especially in terms of catalyst loading. [0003] With the discharge of industrial wastewater and organic wastewater, human health and the living environment are polluted and destroyed, the progress of science and technology and the demand for energy, solar energy has been widely concerned as a renewable energy sou...

AI Technical Summary

Problems solved by technology

[0004] Titanium dioxide, as a semiconductor used in photocatalysis, was discovered because it can decompose water under ultraviolet light irradiation. Afterwards, many studies found that the holes on the surface of titanium dioxide powder can activate oxygen in water and oxygen in the air to form active Oxygen substances, these substances can oxidize organic matter and have been widely concerned and researched. Unfortunately, on the one hand, titanium dioxide nanopowders are dispersed in liquids as catalysts, and agglomeration or secondary agglomeration will inevitably occur. Reduced catalytic activity of titania

There are few reports on the use of carbon fiber as a carrier. The main reasons are: 1. The surface of carbon fiber has a turbostratic graphite structure, the surface is smooth and inert, and it cannot achieve good wetting and bonding with the catalyst, and it is easy to fall off when supporting the catalyst.

2. The surface area of ​​carbon fiber is not large enough, and the contact area with the catalytically degraded organic solvent is not enough

[0006] The main method of introducing nano-titanium dioxide on carbon fiber: chemical modification by activating the surface of the fiber, usually by chemical treatment means, such as using concentrated sulfuric acid, nitric acid or hydrofluoric acid to oxidize the surface of hydroxyl, carboxyl or etching, It provides conditions for chemical modification and grafting, but after a series of chemical treatments, toxic organic solvents will be introduced, causing serious environmental pollution. In addition, the stable structure of the surface of the fiber needs to be activated under extreme conditions, and the strength and performance of the fiber itself are also affected. will be destroyed; chemical vapor deposition, surface spraying, and sol-gel can also be used to introduce nano-titanium dioxide. These methods are somewhat complicated, require professional equipment, and are not firmly fixed on the surface

Images