Preparation method of macroporous titanium oxide or precursor of macroporous titanium oxide

Abstract

The invention discloses a preparation method of 20-100 nm macroporous titanium oxide or a precursor of macroporous titanium oxide. The method comprises the following steps of: mixing a five-coordinate or four-coordinate layered alkali metal titanate and an acid solution, stirring at the temperature of 10-150 DEG C, then adding the mixed liquid to a reactor for reaction at the ambient temperature of 50-250 DEG C, filtering out the solids after reaction, drying and calcining the solids at the temperature of 300-600 DEG C to obtain macroporous titanium oxide, titanium oxide precursor or the mixture of macroporous titanium oxide and the titanium oxide precursor with the most probable pore size of 20-100 nm. The preparation method has the advantages of short reaction time, low energy consumption, simple and easy control of preparation conditions and process, easy mass production, simple equipment and low investment cost, and sources of raw materials are very wide; and the pore size of the product prepared by the preparation method can be adjusted within a range of 20-100 nm, and the volume and specific surface area of the pores can also be adjusted and controlled, therefore the requirements of different enzymes on the carriers can be met.

Description

technical field [0001] The invention belongs to the field of inorganic macroporous carriers, and in particular relates to a preparation method of macroporous titanium oxide or its precursor. Background technique [0002] Pore ​​structure is one of the important indicators of inorganic supports. At present, the main methods to obtain macroporous titanium oxide or its precursor with controllable pore structure are as follows: by changing the sol-gel reaction or post-treatment conditions, such as pH value, water volume, adding magnetic field, microwave and calcination temperature, etc. [1] Adjust the pore structure in a small range, and the control of these conditions must be very fine; 2) Add templates of different sizes during the preparation of titania sol [2] Or surfactant, phosphoric acid, nitric acid, ammonia water, etc. [3] As a catalyst or a structure-directing agent, but this method is only suitable for a small amount of preparation, and may cause environmental pollu...

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Problems solved by technology

[0003] In view of the above description, we can see that the sol-gel reaction can be used to prepare titanium oxide above 20nm, but the cost of this preparation method is relatively high, and some methods are difficult to realize industrialization; while Lu Xiaohua et al. (ZL03158274.5) reported that Although the process of using alkali metal titanate as raw material is simple, the titanium oxide they obtain is aimed at the field of small molecule catalysis. The pore size of the obtained titanium oxide can be adjusted within the range of 1-20nm, and the pore size does not reach 20nm or more.

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