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A kind of visible light catalyst and its preparation method and application

A photocatalyst and visible light technology, applied in the direction of arsenate/arsenite, etc., can solve the problems of weak redox ability and low photocatalytic activity, and achieve a simple preparation method, high photocatalytic properties, mild and easy-to-control conditions Effect

Inactive Publication Date: 2014-10-15
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, photocatalysts that can absorb visible light all have a narrow band gap, which means their redox ability is weak, which generally leads to their low photocatalytic activity.

Method used

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  • A kind of visible light catalyst and its preparation method and application
  • A kind of visible light catalyst and its preparation method and application
  • A kind of visible light catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh out AgNO 3 、Na 2 HASO 4 Placed in different beakers, dissolved in deionized water to prepare AgNO with a concentration of 0.2mol / L 3 solution and Na at a concentration of 0.05mol / L 2 HASO 4 After the solution, put it into two separatory funnels; use concentrated ammonia water to prepare ammonia water with a concentration of 0.1mol / L; under the condition of magnetic stirring at room temperature, the AgNO 3 solution and Na 2 HASO 4 Solution reaction to produce orange-yellow precipitate Ag with photocatalytic activity 3 AsO 4 The dropping speed is 2~3d / s. During the titration process, the prepared ammonia water is used to control the pH of the mixture to be 5~8. After the titration is completed, the magnetic stirring is continued at room temperature for 2h. During the reaction process of the mixture, the mass ratio of the concentration of silver nitrate solution, disodium hydrogen arsenate solution and ammonia water is controlled to be 4:1:2. The orange prec...

Embodiment 2

[0025] Weigh out AgNO 3 、Na 2 HASO 4 Placed in different beakers, dissolved in deionized water to prepare AgNO with a concentration of 0.1mol / L 3 solution and Na at a concentration of 0.025mol / L 2 HASO 4 After the solution, put it into two separating funnels; use concentrated ammonia water to prepare ammonia water with a concentration of 0.05mol / L; under the condition of magnetic stirring at room temperature, the AgNO 3 solution and Na 2 HASO 4 Solution reaction to produce orange-yellow precipitate Ag with photocatalytic activity 3 AsO 4 The dropping speed is 2~3d / s. During the titration process, the prepared ammonia water is used to control the pH of the mixture to be 5~8. After the titration is completed, the magnetic stirring is continued at room temperature for 2h. During the reaction process of the mixture, the mass ratio of the concentration of silver nitrate solution, disodium hydrogen arsenate solution and ammonia water is controlled to be 4:1:2. The orange pr...

Embodiment 3

[0027] Weigh out AgNO 3 、Na 2 HASO 4 Placed in different beakers, dissolved in deionized water to prepare AgNO with a concentration of 0.4mol / L 3 solution and Na at a concentration of 0.1mol / L 2 HASO 4 After the solution, put it into two separatory funnels; prepare ammonia water with a concentration of 0.2mol / L with concentrated ammonia water; under the condition of magnetic stirring at room temperature, the AgNO 3 solution and Na 2 HASO 4 Solution reaction to produce orange-yellow precipitate Ag with photocatalytic activity 3 AsO 4The dropping speed is 2~3d / s. During the titration process, the prepared ammonia water is used to control the pH of the mixture to be 5~8. After the titration is completed, the magnetic stirring is continued at room temperature for 2h. During the reaction of the mixture, the mass ratio of the concentration substances of silver nitrate solution, disodium hydrogen arsenate solution and ammonia water is controlled to be 4:1:2. The orange preci...

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Abstract

The invention discloses a visible-light-driven photocatalyst and a preparation method and an application thereof. The preparation method mainly comprises the following steps of: weighing AgNO3 and Na2HAsO4 respectively, putting into different beakers, dissolving with deionized water, and charging into two separating funnels respectively; preparing ammonia water of a certain concentration by using stronger ammonia water; reacting an AgNO3 solution with an Na2HAsO4 solution under a room-temperature magnetic stirring condition by adopting a parallel flow precipitation method; dripping at a speed of 2-3 drips per second while controlling the pH of a mixture at 5-8 by using ammonia water, and continually stirring magnetically at the room temperature for two hours after dripping; and repeatedly washing the prepared orange-yellow precipitate, and drying at the temperature of 60 DEG C to obtain a reddish-brown powdery product, i.e., the Ag3AsO4 photocatalyst. The preparation method disclosed by the invention is simple, and contributes to large-scale popularization and application; conditions in the method are mild, and are easy to control; and the prepared Ag3AsO4 photocatalyst has high activity, and is suitable for degrading organic pollutants under visible light.

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 photocatalytic methods. The rational design of photocatalyst is the core factor to determine the photocatalytic performance, and generally the following aspects need to be considered: (1) Light absorption range. Ultraviolet light only accounts for about 4% of the total energy of sunlight, while visible light accounts for about 46% of the total energy of sunlight. Therefore, the key to utilizing solar energy is to utilize the visible lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68C01G28/02A62D3/17A62D101/28
Inventor 李大塘汤建庭刘永红张馨李海珠黄辉
Owner HUNAN UNIV OF SCI & TECH
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