Pure anatase phase tio with high natural photocatalytic activity 2 Green preparation method

Abstract

The invention relates to an environment-friendly preparation method of pure anatase phase TiO2 with a high catalytic activity under natural light. The preparation method comprises the following steps: (1), weighing and taking 20-50 mL of a solvent a, a stabilizer and tetrabutyl titanate, mixing, stirring uniformly to obtain a mixed liquor A; (2), weighing and taking 5-20 mL of a solvent b and distilled water, mixing uniformly to obtain a mixed liquor B; (3), magnetic stirring while slowly and dropwise adding the mixed liquor B into the mixed liquor A until completion, stirring fully and placing the product in a reaction kettle; (4), sealing the reaction kettle, placing the sealed reaction kettle in a drying oven, heating to 130-180 DEG C, preserving heat for 3-5 h, crystallizing under the self-generated pressure, natural cooling to room temperature to obtain white turbid liquid; (5), washing the white turbid liquid with absolute ethyl alcohol and distilled water repeatedly, performing centrifugal separation until the filtrate is neutral, and drying the obtained product to obtain the pure anatase phase TiO2 polycrystalline nano-powder. The environment-friendly preparation method of the pure anatase TiO2 with a high catalytic activity under natural light can be used for preparation of TiO2.

Description

[0001] Technical field: [0002] The present invention relates to a pure anatase phase TiO with high natural photocatalytic activity 2 Green preparation method. It belongs to the field of development and preparation of environmental purification materials and photocatalysts. [0003] Background technique: [0004] Environmental pollution and resource shortage are not only the major issues that our country implements the sustainable development strategy, but also the major challenges that human society is facing in the 21st century. Photocatalytic technology has two major functions of photo-splitting water to produce hydrogen and photo-degrading organic pollutants. It has attracted much attention in the fields of energy utilization and pollution control. In photocatalytic environmental purification materials, TiO 2 It has the advantages of high photocatalytic activity, non-toxicity, stable chemical properties, no secondary pollution, and low cost. It is considered to be an en...

AI Technical Summary

Problems solved by technology

However, according to TiO 2 Semiconductor Band Theory, TiO 2 As a photocatalytic material, the biggest shortcoming is the narrow photoresponse range, TiO 2 It is a wide bandgap semiconductor (anatase type, E g =3.2eV; rutile type, E g =3.0eV), its photocatalytic properties are limited to the ultraviolet region, and ultraviolet light only accounts for about 3~5% of sunlight, and the utilization rate of sunlight is low.

However, so far, the vast majority of anatase TiO with exposed highly reactive facets 2 During the preparation process, fluorine-containing compounds are required to be used as surface capping agents, and fluorine-containing compounds are generally highly toxic or corrosive