Visible-light-driven photocatalyst as well as preparation method and applications thereof

Abstract

The invention discloses a visible-light-driven photocatalyst as well as a preparation method and applications thereof. The molecular formula of the visible-light-driven photocatalyst is AgIO4, the visible-light-driven photocatalyst is powdered, has a yellow appearance and a prism-shaped microstructure. The preparation method comprises the steps of: firstly, dissolving AgNO3 and KIO4 respectively with deionized water to prepare a solution with certain concentration; under the conditions of room temperature, dark light and magnetic stirring, reacting a AgNO3 solution with a KIO4 solution by adopting a parallel flow precipitation method; controlling the pH of the mixture to be 1 to 3 with certain concentration of nitric acid, after titration, carrying out further magnetic stirring for 2hours under light avoidance condition of room temperature; washing the prepared yellow precipitate for many times, then naturally drying at room temperature to obtain a yellow powder product, namely AgIO4 photocatalyst. The preparation method is extremely simple, the conditions including normal pressure and room temperature of less than of 35 DEG C are mild and easily controlled, the prepared AgIO4 material can be applied in the photocatalytic field, and the visible-light-driven AgIO4 has excellent rhodamine B photocatalytic activity.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection engineering, and in particular relates to a visible light catalyst and its preparation method and application. Background technique [0002] Semiconductor photocatalysis technology can directly use sunlight to oxidize and degrade organic pollutants at room temperature. Therefore, it is an effective way to solve the current environmental pollution problem by making full use of sunlight to degrade organic pollutants through photocatalysis. The rational design of photocatalyst is the core factor that determines the photocatalytic performance. Generally, the following aspects need to be considered: (1) In the light absorption range, ultraviolet light only accounts for about 4% of the total energy of sunlight, while visible light accounts for about 4% of the total energy of sunlight. About 46% of the total energy, therefore, the key to utilizing solar energy is...

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Problems solved by technology

The rational design of photocatalyst is the core factor that determines the photocatalytic performance. Generally, the following aspects need to be considered: (1) In the light absorption range, ultraviolet light only accounts for about 4% of the total energy of sunlight, while visible light accounts for about 4% of the total energy of sunlight. About 46% of the total energy, therefore, the key to utilizing solar energy is to utilize the visible light in sunlight; (2) Quantum efficiency, the photogenerated electrons in the photocatalytic process-holes are easy to recombine, which will lead to a significant reduction in the quantum efficiency of the photocatalyst , so that its photocatalytic activity is significantly reduced. Therefore, the preparation of efficient visible light catalysts is a very challenging and meaningful research topic.

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