Titanium dioxide hollow nanospheres and preparation method thereof

Abstract

The invention discloses a preparation method of titanium dioxide hollow nanospheres. The preparation method comprises the following steps: firstly, silicon dioxide microspheres are prepared from tetraethyl orthosilicate as a silicon source with a Stobe method, then, surfaces of the silicon dioxide microspheres are coated with a titanium dioxide precursor, silicon dioxide cores are removed by strong alkali corrosion, and finally, the crystalline titanium dioxide hollow nanospheres with flaky branch structures on the surface are prepared by hydrothermal treatment. The invention further disclosesthe titanium dioxide hollow nanosphere prepared with the preparation method. The method is simple to operate and good in repeatability, does not need high-temperature sintering, is suitable for large-scale production, avoids agglomeration of titanium dioxide powder, low in process pollution and achieves high product yield and low production cost; the obtained titanium dioxide hollow nanospheres have high purity, uniform particles, good crystallization, controllable crystal form, good dispersity, large specific surface area, high adsorption capacity and capture capacity for pollutants and highphotocatalytic efficiency, and a plurality of flaky branches are contained on the surface.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of titanium dioxide nanometer hollow spheres and titanium dioxide nanometer hollow spheres prepared by the method. Background technique [0002] Due to its unique advantages in structure and photoelectrochemical properties, nanomaterials have become a research hotspot in the field of material science today. Nano-titanium dioxide has unique optical properties, high chemical stability, non-toxicity, low cost, high catalytic activity, and can completely contact with food and human body, so nano-titanium dioxide has potential development prospects in many fields. Especially in the field of photocatalysis, titanium dioxide semiconductor photocatalysts can be used to convert solar energy into electrical and chemical energy. Titanium dioxide semiconductor photocatalyst will generate photogenerated electrons and holes when it is illuminated. Photogenerated holes hav...

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Problems solved by technology

[0005] However, the titanium dioxide nano hollow spheres prepared by the existing methods generally have a smooth surface, the specific surface area is not large enough, the adsorption capacity is limited, and the photocatalytic performance is not high enough.

In addition, in the existing method of preparing hollow titanium dioxide nanospheres, high-temperature sintering treatment is required, and the sintering process not only causes high production costs, pollutes the environment, and the product yield is not high, it is not suitable for large-scale production, and it is easy to cause powder Hard agglomeration, uneven particles, poor dispersion, and poor product quality

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