Method for preparing titanium dioxide porous material

Abstract

The invention discloses a method for preparing a titanium dioxide porous material. The method comprises the following steps: weighing titanate, a hydrolyst, distilled water and a solvent according to a mass ratio of (3-4):(2-5):(1-3):(2-4), mixing and stirring the above four substances, putting into a polytetrafluoroethylene high-pressure reaction kettle, uniformly grinding activated carbon by using an agate mortar, adding obtained activated carbon powder into the reaction kettle, acutely and uniformly stirring so as to obtain gel, putting the reaction kettle into an oven of 150-180 DEG C for 3-8 hours, drying the obtained gel in a drying oven, roasting the dried gel at 500-600 DEG C for 3-6 hours so as to remove an activated carbon template, thereby obtaining the titanium dioxide porous material, wherein the titanate is tetraethyl titanate, tetrapropylorthotitanate, isopropyl titanate or tetra-n-butyl titanate; the solvent is absolute ethyl alcohol, absolute methanol, isopropanol or n-butyl alcohol; the hydrolyst is a mixed liquid of hydrochloric acid and sulfuric acid in a mass ratio of (3-5):(2-3). The raw materials of titanium dioxide prepared by using the method are cheap in price, the preparation process is simple, the titanium dioxide crystal form is mainly anatase, and photocatalytic performance which is relatively good when being compared with the photocatalytic performance of P25 commercial titanium dioxide is achieved.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide porous material. Background technique [0002] Titanium dioxide is a low-cost, completely pollution-free and extremely stable semiconductor material. Under the irradiation of ultraviolet and visible light, electrons in the valence band are excited to the conduction band, and holes are formed in the valence band at the same time. Processing and other fields have broad application prospects. Due to the many advantages of nano-titanium oxide (such as high efficiency, environmental friendliness, non-toxicity and low cost, etc.), it is considered to be one of the most promising photocatalysts for photolysis of water to produce hydrogen, water and air purification, and sensitized solar cells. . Titanium oxide has three crystal structures: anatase, brookite and rutile, in which anatase and brookite are thermodynamically metastable phases, and rutile is a thermodynamically stable phase. The fi...

AI Technical Summary

Problems solved by technology

Usually only the anatase phase titanium oxide has high photocatalytic activity, while the rutile phase and brookite phase titanium oxide have only weak or no catalytic activity.