Preparation method of silver-carrying titanium dioxide nanocomposite photocatalyst

A silver-loaded titanium dioxide, nano-composite technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the complex preparation process, poor stability, and the need for chemical additives. and other problems, to achieve the effects of improving performance, improving utilization, and flexible and convenient preparation methods.

CN106732570AInactive Publication Date: 2017-05-31XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-05-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a silver-carrying titanium dioxide nanocomposite photocatalyst. The preparation method comprises the following steps: (1) ultrasonically cleaning titanium sheets and silver sheets; (2) putting the titanium sheets cleaned in step (1) in water, ablating surfaces of the titanium sheets with optical fiber laser, and removing the remaining titanium sheets to prepare a titanium dioxide nanoparticle solution; (3) flatly putting the silver sheets cleaned in step (1) in the titanium dioxide nanoparticle solution obtained in step (2), ablating the surfaces of the silver sheets with the optical fiber laser, and removing the remaining silver sheets to prepare a silver-carrying titanium dioxide nanoparticle solution; and (4) drying water in the obtained silver-carrying titanium dioxide nanoparticle solution, and then calcining in vacuum to obtain the silver-carrying titanium dioxide nanocomposite photocatalyst. The preparation method provided by the invention is flexible and convenient, enables an operator to control laser and calcination temperature by only operating a computer and a tubular furnace simply so as to prepare a desired nanocomposite material.
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Description

technical field

[0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a preparation method of silver-loaded titanium dioxide nanocomposite photocatalysts. Background technique

[0002] Titanium dioxide photocatalyst has become the most popular photocatalyst because of its high catalytic efficiency, stable chemical properties and non-toxicity. However, there are two obvious defects in titanium dioxide, which limit its further application. On the one hand, the high recombination rate of electron-hole pairs leads to low quantum yield, which makes it difficult to purify pollutants with high concentration; on the other hand, because of its wide forbidden band, it only absorbs ultraviolet light and has low utilization rate of solar energy. The deposition of noble metal silver on the surface of titanium dioxide can not only form a Schottky barrier to reduce the recombination rate of electron-hole pairs, but also expand the absorption s...

Examples

Embodiment 1

[0026] A preparation method of silver-loaded titanium dioxide nanocomposite photocatalyst, comprising the steps of:

[0027] (1) Ultrasonic cleaning of the titanium sheet and silver sheet in deionized water for 25-35 minutes, and then ultrasonic cleaning in absolute ethanol for 25-35 minutes; the purity of the above-mentioned titanium sheet is 99.99%, and the size is 20mm×20mm×2mm, The purity of the above-mentioned silver flakes is 99.8%, and the size is Φ15mm×2mm;

[0028] (2) Put the titanium sheet cleaned in step (1) into 3.5mL deionized water, ablate the surface of the titanium sheet with a fiber optic pulse laser, take out the remaining titanium sheet, and prepare a titanium dioxide nanoparticle solution, wherein the titanium sheet and the liquid The surface distance is 1.8~2.2mm;

[0029] (3) Put the silver flakes cleaned in step (1) into the titanium dioxide nanoparticle solution obtained in step (2), ablate the surface of the silver flakes with an optical fiber pulse ...