Preparation method of vanadium-boron co-doping titanium dioxide and nickel oxide composite photocatalyst

Abstract

The invention discloses a preparation method of visible-light response vanadium-boron co-doping titanium dioxide and nickel oxide composite nano photocatalyst, which belongs to the field of preparation and application of a nano material. The preparation method comprises the following steps: (1) preparing nickel oxalate dry gel by adopting nickel acetate tetrahydrate as a precursor; (2) adding the nickel oxalate dry gel in the process for preparing the boron-vanadium co-dopinng nano titanium dioxide in a sol-gel method, so as to further form composite photocatalyst gel; and (3) drying and grinding the gel, and thermally treating the gel to obtain the nano titanium dioxide nickel oxide composite photocatalyst. The photocatalyst prepared in the method is excellent in optical catalytic effect, the light frequency response range is enlarged from an ultraviolet region to a visible light region, and the optical catalytic efficiency is greatly improved. Moreover, the preparation raw material is easy to obtain, the reaction condition is moderate, and byproducts are pollution-free to the environment.

Description

technical field [0001] The invention belongs to the field of preparation and application of nanometer materials, and in particular relates to a preparation method of a boron / vanadium co-doped titanium dioxide and nickel oxide composite nanometer photocatalyst responding to visible light. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is widely used in coatings, papermaking, cosmetics and other fields because of its stable chemical properties, insoluble in dilute acids and alkalis, and no biological toxicity. However, with the discovery and development of titanium dioxide photocatalysis, titanium dioxide has become a research hotspot again. The photocatalytic property of titanium dioxide is its ability to convert light energy into chemical energy. When irradiated by ultraviolet light, titanium dioxide absorbs photons, and the electrons on the valence band are excited to the conduction band to form separated electrons and holes. These free ...

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Problems solved by technology

[0003] Aiming at the problems of low utilization rate of light energy and low photocatalytic efficiency of pure titanium dioxide, the present invention combines two strategies of element doping and semiconductor heterostructure, and expands the efficiency of titanium dioxide through composite doping of non-metallic element boron and transition metal element vanadium. Photoresponse range, by making a p-n semiconductor heterojunction structure with nickel oxide, reducing the recombination probability of photogenerated carriers and improving photocatalytic efficiency, and then proposing a composition design and related preparation method of a new titanium dioxide-based nano-photocatalyst

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