A core-shell structure titanium dioxide mesoporous material with cavity and preparation method thereof

Abstract

A core-shell structure titanium dioxide mesoporous material with a cavity and a preparation method thereof, belonging to the field of material technology, the grain size of the material is 10-30nm, stacked to form a core-shell structure with mesoporous structures, including a shell structure and a core structure; method It is: (1) mix ethanol and water into ethanol aqueous solution; (2) add titanium sulfate; (3) add ammonium chloride powder and stir to form a colorless and transparent mixed solution; (4) put it into the reaction kettle, React at 220°C for 1 to 10 hours, cool naturally, and separate the solid phase as a precursor; (5) Wash and dry the precursor and then roast to prepare a core-shell structure titanium dioxide mesoporous material with a cavity. The product of the present invention has the advantages of large specific surface area, strong adsorption capacity, easy diffusion and transportation of reactants / products, good anti-poison performance and recyclability; the method is simple to operate and avoids the problems of increased production costs and environmental costs.

Description

Technical field [0001] The invention belongs to the technical field of metal oxide materials, and particularly relates to a core-shell structured titanium dioxide mesoporous material with a cavity and a preparation method thereof. Background technique [0002] Increasing water pollution has promoted the research of photocatalytic degradation materials, nanocrystalline TiO 2 It has the characteristics of high catalytic activity, good chemical stability, low energy consumption, non-toxicity and safety, and low price. It is an ideal semiconductor photocatalytic degradation material. The main problem hindering its application and promotion is that the absorption efficiency of visible light is not high, and its catalytic stability and recycling capacity need to be further improved; TiO 2 The mesoporous material has high porosity, large specific surface area and activity, can absorb more organic pollutants, and can use the multiple reflection between the grains in the pores to enhance i...

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Problems solved by technology

Soft templates usually use surfactants to form micelles or vesicles, etc., and obtain composite materials with hollow or core-shell structures after roasting, which affects many parameters and is not conducive to industrialization; hard templates mostly use organic polymer microspheres, dioxide Silicon microspheres, carbon spheres, etc. are used as carriers, and the nano-titanium dioxide is evenly distributed on the surface of the carrier in the form of a shell, but the bonding strength of the loaded titanium dioxide shell is insufficient, and the loading capacity is not high

It is also reported that a titanium dioxide material with a core-shell structure is prepared by hydrothermal method using titanium alkoxide as a titanium source, but the titanium alkoxide is unstable and easily hydrolyzed, and the reaction rate is difficult to control; Chinese patent CN201010201801.6 discloses a titanium dioxide material with a core-shell structure A method for preparing nanomaterials, which uses trivalent titanium salt and glucose as initial raw materials, and obtains titanium dioxide nanomaterials with a core-shell structure by solvothermal and calcination

This method needs to comprehensively consider the degree of removal of residual carbon in the precursor and the overall degree of damage to the core-shell structure by sintering, which increases the production cost of the calcination process and the difficulty of controlling the structure repeatability

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