Preparation method of porous visible light catalytic composite material with high adsorption capacity

Abstract

The invention relates to preparation of semiconductor materials, and aims to provide a preparation method of a porous visible light catalytic composite material with high adsorption capacity. The method comprises the steps: mixing and stirring TiO2 sol and a cellulose acetate solution to be uniform to serve as a spinning solution, and preparing fibers through an electrostatic spinning device; carrying out activating treatment on the prepared fibers by adopting an activating agent aqueous solution; and pre-oxidizing at a high temperature, and calcining in a nitrogen atmosphere at the temperature of 400-600 DEG C to obtain a visible light response type nano TiO2 porous fiber. The problem of blockage of a porous structure of a carrier in the prior art is avoided, the combination of the nano TiO2 particles and the matrix is firmer, the application stability of the catalyst is greatly improved, and the recycling service life of the catalyst is greatly prolonged. According to the activation-pre-oxidation-carbonization preparation process, the contact area between the nano TiO2 particles and the external environment can be greatly increased, the adsorption and capture capacity on organicpollutants such as dyes and formaldehyde is high, and improvement of photocatalytic reaction efficiency is facilitated.

Description

technical field [0001] The invention relates to the preparation of semiconductor materials, in particular to a preparation method of a porous visible light catalytic composite material with high adsorption capacity. Background technique [0002] The photocatalytic method of semiconductor materials can be used to degrade environmental pollutants at room temperature, and does not produce secondary pollutants, so it has a very good application prospect. TiO in current photocatalysts 2 It is a relatively mature photocatalyst, which has the advantages of non-toxicity, high activity and low cost, and has achieved industrial application. TiO 2 It can degrade refractory organic matter, purify the air, and kill bacteria. Traditional nano-TiO 2 Suspension phase photocatalysts are prone to deactivation, easy to agglomerate, and difficult to recycle. The existing technology is mainly to use nano-TiO 2 Loaded on the surface of porous materials with large specific surface area, mostl...

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Problems solved by technology

TiO 2 It can degrade refractory organic matter, purify the air, and kill bacteria. Traditional nano-TiO 2 The disadvantages of suspension phase photocatalysts are easy to deactivate, easy to agglomerate, and difficult to recycle

The existing technology is mainly to use nano-TiO 2 Loaded on the surface of porous materials with large specific surface area, mostly TiO 2 Nanoparticles and porous carrier particles are physically mixed to achieve loading by electrostatic adsorption, or TiO2 is placed on the surface of porous carrier particles 2 In situ growth of nanoparticles, but overall, TiO 2 Nanoparticles are easy to fall off, and the binding strength of the load needs to be further improved. Moreover, the loading of nanoparticles will also block the porous structure of the original carrier and reduce the specific surface area of ​​the material.

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