Preparation method and application of boron-nitrogen co-doped titanium dioxide photocatalyst

Abstract

The invention discloses a preparation method of a boron-nitrogen co-doped titanium dioxide photocatalyst, which comprises the following steps of: preparing the boron-nitrogen co-doped titanium dioxidephotocatalyst by using titanium sulfate as a titanium source, ammonia water as a precipitant and a nitrogen source, and boric acid as a boron source by combining a simple precipitation method and a solid-phase pyrolysis method; the method also comprises the following steps of: (1) preparing a nitrogen single-doped titanium dioxide precursor; (2) preparing the boron-nitrogen co-doped titanium dioxide photocatalyst. The method is simple and convenient to operate, and the prepared photocatalyst has good appearance and high photocatalytic performance. Meanwhile, the nano semiconductor material istaken as a photocatalyst, and a special catalysis or conversion effect is acheved through the interface interaction with antibiotic pollutant molecules, so that oxygen and water molecules on the surface of a catalyst are converted into substances with strong oxidizability, such as superoxide free radicals, hydroxyl free radicals and the like, so as to achieve the purpose of catalytic removal of antibiotic residues in a water environment; the method does not cause resource waste and secondary pollution, and is simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of environmental material preparation, in particular to a preparation method and application of a boron-nitrogen co-doped titanium dioxide photocatalyst. Background technique [0002] TiO 2 Photocatalysts have attracted much attention due to their advantages of low cost, high chemical stability, green efficiency, etc. However, due to their wide bandgap, traditional TiO 2 Can only use less than 5% of the ultraviolet radiation in sunlight; and TiO 2 The high recombination probability of photogenerated electrons and holes generated by electricity leads to low photocatalytic efficiency. Therefore, in order to solve the above two problems, researchers have studied TiO 2 A series of improvement studies have been carried out, mainly including noble metal deposition, ion doping, semiconductor material compounding, surface photosensitization, and surface acid-base modification to improve the TiO 2 Photocatalytic ...

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Problems solved by technology

[0002] TiO 2 Photocatalysts have attracted much attention due to their advantages of low cost, high chemical stability, green efficiency, etc. However, due to their wide bandgap, traditional TiO 2 Can only use less than 5% of the ultraviolet radiation in sunlight; and TiO 2 The high recombination probability of photogenerated electrons and holes generated by electricity leads to low photocatalytic efficiency

However, most of the photosensitizers commonly used at present can only absorb part of the sunlight, and the utilization rate of sunlight is low, and the photosensitizers are also adsorbed on TiO 2 There is adsorption competition between pollutants on the surface, and the photosensitizer will also degrade itself under light, so the practical application of this method is difficult.

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