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Composite visible light photocatalyst and its preparation method

A photocatalyst and visible light technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low utilization rate and poor stability of visible light, and achieve large-scale promotion and low cost. The effect of low and mild synthesis conditions

Inactive Publication Date: 2014-07-16
JIANGSU UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost high-efficiency silver carbonate composite visible light photocatalyst and its preparation method, through the ion exchange method to synthesize the photocatalyst composite material of silver halide and silver carbonate, realize AgX in Ag 2 CO 3 Effective dispersion on the substrate, while achieving the purpose of regulating its size; and solving the problems of low utilization rate of visible light and poor stability of existing photocatalysts

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  • Composite visible light photocatalyst and its preparation method
  • Composite visible light photocatalyst and its preparation method
  • Composite visible light photocatalyst and its preparation method

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preparation example Construction

[0023] Visible light responsive AgX / Ag of the present invention 2 CO 3 (X=Cl, I) the preparation method of composite photocatalyst specifically comprises the following steps:

[0024] In the first step, place silver carbonate in an aqueous solution for ultrasonic dispersion for 20-40 minutes to obtain a silver carbonate dispersion, and the mass ratio of silver carbonate to water is 0.1:100~1:100.

[0025] In the second step, the halogenated ionic liquid ([C n min]X (X=Cl, I, n=4-16)) into deionized water, fully dissolved to form a halogenated ionic liquid solution; the mass ratio of the halogenated ionic liquid to water is 0.1:100~2:100; The role of the ionic liquid is to make the silver halide uniformly dispersed in the Ag 2 CO 3 surface, forming a heterojunction structure.

[0026] The third step is to add the prepared halogenated ionic liquid solution dropwise to the solution obtained in the first step under the condition of heating at 40-60°C in a water bath and stir...

Embodiment 1

[0029] Embodiment 1: AgCl / Ag of visible light response of the present invention 2 CO 3 (4.92 wt%) preparation method of composite photocatalyst, specifically comprises the following steps:

[0030] In the first step, 0.278 g of silver carbonate was ultrasonically dispersed in 30 ml of deionized water for 20 minutes to obtain a silver carbonate dispersion.

[0031] In the second step, 0.034 g of [C 16 min]Cl chlorinated ionic liquid was added into 20 ml of deionized water and fully dissolved to form a chlorinated ionic liquid solution.

[0032] The third step is to add the prepared chlorinated ionic liquid solution dropwise to the solution obtained in the first step under the condition of heating at 40° C. in a water bath and stirring uniformly, and continue stirring for 160 minutes after the dropwise addition is completed.

[0033] In the fourth step, the product obtained in the third step reaction is washed three times with deionized water and absolute ethanol respectively...

Embodiment 2

[0034] Embodiment 2: AgCl / Ag of visible light response of the present invention 2 CO 3 (13.43 wt%) The preparation method of composite photocatalyst specifically comprises the following steps:

[0035] In the first step, 0.278 g of silver carbonate was ultrasonically dispersed in 30 ml of deionized water for 30 minutes to obtain a silver carbonate dispersion.

[0036] In the second step, 0.103 g of [C 16 min]Cl chlorinated ionic liquid was added into 20 ml of deionized water and fully dissolved to form a chlorinated ionic liquid solution.

[0037] The third step is to add the prepared chlorinated ionic liquid solution dropwise to the solution obtained in the first step under the condition of heating in a water bath at 50° C. and stirring uniformly, and continue stirring for 170 minutes in shading after the dropwise addition is completed.

[0038] In the fourth step, the product obtained in the third step reaction is washed three times with deionized water and absolute ethan...

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Abstract

The invention relates to a photocatalyst, which relates to a visible light responded AgX / Ag2CO3(X=C1, I)composite photocatalyst and its preparation method. The preparation method comprises the following steps: placing silver carbonate in an aqueous solution and ultrasonically dispersing to obtain a dispersion liquid of silver carbonate; fully dissolving halogenated ionic liquid in deionized water, heating in water bath and uniformly stirring, dropping the halogenated ionic liquid in the dispersion liquid of silver carbonate, continuously stirring for a while after dropping; after the reaction is completed, cooling to the room temperature, washing the products obtained in the reaction, and drying to obtain the photocatalyst. The preparation method has the advantages of simple process, and can effectively degrade a colored dye (methylthionine chloride) under visible light irradiation. The method uses good control synthesis function of the ionic liquid, better disperses AgX on an Ag2CO3 matrix, so that a purpose of enhancing the degradation performance of the photocatalysis.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a visible light responsive AgX / Ag 2 CO 3 The invention discloses a (X=Cl, I) composite photocatalyst and a preparation method thereof, belonging to the technical field of photocatalysis in composite materials and environmental treatment. Background technique [0002] Among the many environmental problems faced by human beings, the removal of highly toxic and persistent organic pollutants has always been a difficult problem; at present, the use of photocatalytic technology to degrade organic pollutants has become the most active research direction, using the physical properties of semiconductors to convert light energy It is converted into chemical energy, degrades organic pollutants under relatively mild conditions, makes them completely mineralized, and degrades into small inorganic molecules without causing secondary pollution. Compared with other treatment methods, it has incomparable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232
Inventor 许晖朱嘉祥李华明宋永秀宋艳华
Owner JIANGSU UNIV
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