Hydrothermal method for synthesizing visible light catalyst SnWO4

Abstract

The invention relates to a synthesizing method of a visible light catalyst SnWO4 (stannous wolframate), comprising the following steps: respectively adding SnCl2.2H2O and Na2WO4.2H2O which have the same substance amount to equivalent deionized water to be dissolved; mixing two solutions after dissolution; sufficiently stirring so as to obtain flaxen creaming; reacting an obtained reaction mixture containing the flaxen creaming at 120-200 DEG C for 24 hours in a sealing state; and filtering, collecting, washing, drying and grinding obtained rufous sediments after reaction so as to obtain the visible light catalyst SnWO4. The invention adopts ultrasonic preprocessing, has simple equipment, uniformly disperses the reaction mixture through ultrasonic cavitation action, reduces the grain diameter of the visible light catalyst SnWO4, enlarges the specific surface area and can enhance the light catalytic activity of the visible light catalyst SnWO4; a hydrothermal method can directly obtain well-crystallized powder without high-temperature calcination and crystallization and has lower synthesizing temperature and low equipment requirement; and in addition, the visible light catalyst SnWO4 (stannous wolframate) prepared by the method has high activity.

Description

technical field [0001] The present invention relates to the synthesis of a kind of photocatalyst, especially the synthesis of visible light catalyst, specifically a kind of visible light catalyst SnWO 4 (Stannous tungstate) synthesis method. Background technique [0002] The formal research on the application of photocatalysis in environmental protection and governance began in the late 1970s. Fank and Bard on cyanide in water in TiO 2 Photodecomposition research on the above and Carey et al. on PCBs in TiO 2 The degradation research under ultraviolet light has played a great role in promoting the rapid development of photocatalysis. Photocatalytic technology utilizes the surface energy activation characteristics of semiconductor materials under light, and uses light energy to effectively oxidize and decompose organic matter, reduce heavy metal ions, kill bacteria and eliminate odors. Because photocatalytic technology can use solar energy to react at room temperature, it...

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Problems solved by technology

[0004] Solid-phase synthesis (see: In-Sun Cho, Chae Hyun Kwak, Dong Wook Kim, Sangwook Lee, and Kug Sun Hong. Photophysical, Photoelectrochemical and Photocatalytic Properties of Novel SnWO 4 Oxide Semiconductors with Narrow Band Gaps·J Phys Chem C 2009(113):10647~10653), this method is based on SnO and WO 3 After mechanical mixing, the photocatalyst SnWO was directly sintered at a high temperature of 800 °C for a certain period of time. 4 (Stannous tungstate), the synthesis conditions of this method are harsh, the reaction temperature is high, the equipment requirements are high, the energy consumption is high, the mixing of the precursor materials lacks uniformity, the particle size of the synthetic catalyst product is large, the distribution is uneven, and the specific surface area is large. Small, the adsorption of pollutants to be decomposed and degraded on the surface of the catalyst is small, so the activity of visible light catalysis is not high

[0005] In summary, the existing methods have high requirements for equipment, high energy consumption, complex operation, and harsh conditions. Therefore, it is necessary to develop a simple and low-energy synthesis method that can synthesize a highly active visible light catalyst SnWO 4 (Stannous Tungstate), which can decompose and degrade organic matter under visible light irradiation, and has good environmental and economic benefits for long-term development