Method for preparing nanometer TiO2 with hierarchical structure

Abstract

The invention belongs to the field of nanometer materials, and relates to a method for preparing nanometer TiO2 with a hierarchical structure. A preparation process flow comprises the following steps of: preparing an Na2Ti5O11 precursor from a metal Ti sheet serving as a substrate, NaOH serving as reaction solution and SnC14.5H2O serving as a mineralizing agent by using a hydrothermal method, performing ion exchange by using HCl solution to obtain H2Ti5O11, and performing quenching to obtain the nanometer TiO2 with the hierarchical structure, wherein the aqueous solution of NaOH has the concentration of 0.5 to 2 mol / L; the aqueous solution of SnC14.5H2O has the concentration of 0.05 to 0.2 mol / L; the HCl solution has the concentration of 0.05 to 2 mol / L; the hydrothermal reaction is performed at the temperature of 160 to 220 DEG C for 12 to 60 h; and the quenching is performed at 450 to 750 DEG C for 0.5 to 3.5 h. In the method, the nanometer TiO2 with the hierarchical structure is synthesized by the hydrothermal method, and has a relatively larger specific surface area; and the method prevents the secondary aggregation of the hierarchical structure and is favorable for improving the photocatalytic performance of the material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a nano TiO with hierarchical structure 2 method of preparation. Background technique [0002] TiO 2 It is a wide bandgap semiconductor with a band gap of 3.2 eV. Nano-TiO 2 With many excellent characteristics, it has broad application prospects in coatings, cosmetics, health care, wastewater treatment, light, electricity, and catalytic environmental protection. Therefore, nano-TiO 2 Research and application are extremely active. In recent years, the synthesis of nano-TiO with hierarchical structure 2 It has become a research hotspot. The so-called hierarchical structure is formed by the aggregation of building blocks at different microscopic levels through self-organization. This self-organization can effectively prevent the material agglomeration caused by the strong van der Waals force on the surface of nanomaterials, and finally can effectively It is beneficial to t...

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Problems solved by technology

[0003] Since the alkylate of titanium is highly chemically active to water, it is difficult to control its hydrolysis and concentration process, and the control of its hydrolysis and concentration process directly determines the controllability of product morphology, size and structure. Therefore, Synthesis of Hierarchical TiO with Controlled Morphology and Size 2 still a big challenge

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