Preparation method for mesoporous hollow spherical TiO2 having high visible light catalysis performance

Abstract

The invention relates to a preparation method for mesoporous hollow spherical TiO2 having high visible light catalysis performance. The preparation method is characterized in that carbon microspheres prepared by adopting glucose as a raw material under high temperature and high pressure hydrothermal conditions are adopted as a template agent, titanium tetrachloride is adopted as a titanium source, urea is adopted as a nitrogen source, an acid catalyzed hydrolysis method is adopted to prepare a spherical TiO2 precursor, the pH value is adjusted with ammonia water, centrifugal separation is performed to obtain a white solid product, a heat treatment is performed on the obtained product at a high temperature in a tube type resistance furnace, and the carbon microsphere template agent is removed to obtain the hollow spherical TiO2 having the mesoporous structure, wherein the obtained hollow spherical TiO2 has high phenol degradation performance under visible light. According to the present invention, the main characteristics of the operation process comprise that the carbon microspheres prepared from the glucose are adopted as the template agent, the titanium tetrachloride is subjected to acid catalyzed hydrolysis and then is coated on the surface of the carbon microspheres, and the high temperature calcination is performed to form the spherical TiO2 with characteristics of hollow structure, rich mesopore, and visible light catalysis activity, wherein the phenol degradation rate of the mesoporous hollow spherical TiO2 achieves 80-90% after light irradiation for 3 h when the calcination temperature is 700 DEG C.

Description

Technical field: [0001] The invention relates to the field of preparation of photocatalytic materials, in particular to a mesoporous hollow spherical TiO with high visible light catalytic performance 2 method of preparation. Background technique: [0002] In recent years, photocatalytic oxidation of organic pollutants using semiconductor metal oxides has become an ideal environmental treatment technology, among which TiO 2 It has received great attention because of its high catalytic performance, strong oxidation ability and good corrosion resistance. However, traditional granular materials are difficult to recycle, have underdeveloped pore structure, few attachment points, and can only use 5% of sunlight's ultraviolet light, which limits its wide application in industry. [0003] Doping of non-metals such as N, C, S, N-F, etc. on TiO 2 Visible light catalytic activity is significantly affected. Among them, N doping is considered to be the most effective in inducing its ...

AI Technical Summary

Problems solved by technology

This method is simple and easy to operate and easy to recycle, but the selective photocatalysis is more obvious and the reaction cycle is longer

[0011] In summary, the preparation of visible-light photocatalytic TiO 2 The method mainly involves ultrasonic method, solvothermal method and other means to make thin film and granular, involves metal and non-metallic doping modification, and the reaction often requires organic reagents. These methods can improve dispersibility, increase visible light activity or improve difficult Recycling and other defects, but the reaction cycle is long, the reaction conditions are relatively high, which increases the environmental load and increases the reaction cost

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