The Preparation process of High-efficiency Copper-VOT Photocatalysts

With the increasing problems of energy and environment, the pollution of water resources by organic matter is particularly prominent, which not only affects human health, but also consumes a large amount of energy to eliminate such pollutants. Therefore, the development of new materials using photocatalytic technology to solve pollution has become a new research direction.

At present, methods for preparing a transition metal doped photocatalyst material mainly include a sol-gel method, a hydrothermal method, a precipitation method, a microemulsion method, a gas phase method, and the like. However, some of the above methods have a long preparation time, and some methods have problems such as particle size and distribution, uneven pore structure, and high cost of preparing catalysts. Therefore, there is a need to develop new low-cost, high-efficiency photocatalysts.

Among many catalyst materials, violet tungsten oxide (VTO) has a special surface structure, high chemical activity, large concentration of oxygen-deficient structure, and a high degree of absorption in ultraviolet light. At the same time, studies have shown that copper as a doping element can be very good. Improve the response of the catalyst in the visible range. Therefore, the choice of copper-VOT photocatalyst as a photocatalytic material has a good application prospect.

The copper-VOT photocatalyst can be carried out by the simplest hydrothermal method, and its contents include:

1. Raw materials: The raw materials used are VOT, copper, ammonium nitrate and adjuvants.

2. Solution preparation: The selected raw materials are formulated into a solution according to a certain ratio and uniformly mixed.

3. Precursor preparation: The aqueous solution obtained in step 2 is heated, and as the aqueous solution is volatilized, the solution is bubbled after concentration, a large amount of gas is released, and a vigorous redox reaction occurs in several tens of seconds to form a copper-VOT powder. The obtained powder was in the form of a nanoneedle having a diameter of 50 to 150 nm and a length of 1 to 3 μm. The catalyst with a concentration of 1 g/L was applied to the degradation of methylene blue, an organic pollutant of 20 ppm, and the degradation rate was 92% at around 35 minutes.

Using tungstate (ammonium metatungstate) and copper nitrate as raw materials, copper-doped purple tungsten powder is directly synthesized by hydrothermal method, which is applied to photocatalysis, has low cost and high efficiency, and is suitable for large-scale production.

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