Preparation method for TiO2 nanomaterial with hollow structure and application thereof

Abstract

The invention belongs to the technical field of nanomaterials. The invention provides a preparation method for a TiO2 nanomaterial with a hollow structure and application thereof in the field of photocatalysis. With alcoholic solvent as reaction medium and structure-directing agent, the preparation method first utilizes the polymerization reaction between phenol and aldehyde and ammonia initiation to synthesize phenolic resin polymer spheres (RF), titanium precursor is then hydrolyzed on the surfaces of the polymer spheres, and thereby an RF@TiO2 core-shell structure is formed. The organic matter core is then removed by roasting, and thereby the TiO2 nanomaterial with the hollow structure is obtained. The nano TiO2 which is obtained by adopting the method disclosed by the invention has the hollow structure, the diameter of the particle is as small as 20nm to 70nm, the degree of crystallinity is high, product purity is high, the pore volume is up to 0.1cm<3> / g to 0.4cm<3> / g, the specific surface area is 50m<2> / g to 200m<2> / g, and therefore the TiO2 nanomaterial has high photocatalytic activity; moreover, the preparation method is simple to operate, the reaction conditions are mild, templates can be easily removed without using strong acid and strong alkali, the TiO2 nanomaterial is environment-friendly, energy consumption is little, and the TiO2 nanomaterial is easy to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a hollow structure TiO 2 Preparation methods of nanomaterials and their applications in the field of photocatalysis. Background technique [0002] Titanium dioxide (TiO 2 ) is a white loose powder, which has abundant reserves, low price, non-toxicity, good thermal stability, good chemical stability, high refractive index and ultraviolet absorption capacity, and excellent photocatalytic and photoelectric properties. Since the 1920s, TiO 2 After it was commercialized as a white pigment, it gradually became active and became a particularly good component in many products, and was used in various fields such as pigments, food colorants, personal skin care products, and ultraviolet shielding agents. Currently, these applications are in the global TiO 2 It still accounts for the vast majority of consumption, but its application in the nanometer field is still mainly focused o...

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Problems solved by technology

[0003] Although nano-TiO 2 It has been widely used in antibacterial and photocatalytic treatment of refractory organic pollutants, but it also has certain defects: one is TiO 2 The forbidden band is wide (Eg=3.2ev), and it can only respond to ultraviolet light below 387.5nm (accounting for about 8% of solar energy), while the visible light that accounts for the vast majority of the solar spectrum has not been effectively utilized. Level of high catalytic activity, there will be a significant quantum size effect, and the light absorption band edge is further blue-shifted, resulting in extremely low utilization efficiency of visible light; the second is nano-TiO 2 The photogenerated electrons-holes are easy to recombine, resulting in very low photon quantum efficiency, which affects its photocatalytic activity.

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