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Silver/silver iodide composite material modified with cadmium tungstate and its preparation method and application

A composite material, cadmium tungstate technology, applied in chemical instruments and methods, catalyst activation/preparation, water treatment of special compounds, etc., can solve the problems of unsatisfactory separation efficiency of photogenerated charges, complex synthesis method, high temperature required, etc., to achieve The effect of photogenerated charge conduction and separation is high, the absorption range is wide, and the absorption intensity is enhanced

Active Publication Date: 2020-03-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, although various CdWO 4 Based photocatalytic materials, such as CdS / CdWO 4 , g−C 3 N 4 / CdWO 4 、CdWO 4 / Bi 2 o 2 CO 3 、C 3 N 4 / CdS / CdWO 4 、WO 3 / CdWO 4 etc. have been prepared, but the synthesis method of the above materials is complicated, the required temperature is high, the energy consumption is high, the production cost is high, and the separation efficiency of the photogenerated charge of the product is not ideal, which is difficult to meet the needs of industrial applications.

Method used

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  • Silver/silver iodide composite material modified with cadmium tungstate and its preparation method and application
  • Silver/silver iodide composite material modified with cadmium tungstate and its preparation method and application
  • Silver/silver iodide composite material modified with cadmium tungstate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A silver / silver iodide composite material modified with cadmium tungstate comprises cadmium tungstate and silver / silver iodide material, the silver / silver iodide material is supported on cadmium tungstate, and the silver / silver iodide material is composed of Ag nanoparticles and silver iodide.

[0050] In this embodiment, in the silver / silver iodide composite material modified by cadmium tungstate, the mass percentage of Ag nanoparticles is 1.2%, the mass percentage of silver iodide is 72.4%, and the mass percentage of cadmium tungstate is 26.4%. .

[0051] In this example, the specific surface area of ​​the silver / silver iodide composite material modified by cadmium tungstate is 3.42 m 2 / g, the average pore diameter is 6.44 nm, and the pore volume is 0.0096 cm 3 / g.

[0052] In this embodiment, the silver / silver iodide material is in the shape of random particles with a size of 200 nm to 800 nm; the cadmium tungstate is in the shape of regular nanorods with a length...

Embodiment 2

[0066] A silver / silver iodide composite material modified by cadmium tungstate, which is basically the same as the silver / silver iodide composite material modified by cadmium tungstate of Example 1, the difference being: the silver / silver iodide composite material modified by cadmium tungstate of embodiment 2 Among them, the mass percentage of Ag nanoparticles is 1.5%, the mass percentage of silver iodide is 90.3%, and the mass percentage of cadmium tungstate is 8.2%.

[0067] A kind of preparation method of the silver / silver iodide composite material modified by cadmium tungstate of the above-mentioned present embodiment is basically the same as the preparation method of the silver / silver iodide composite material modified by embodiment 1 cadmium tungstate, the difference is: embodiment 2 CdWO in step (2) 4 The dosage is 50 mg.

[0068] The silver / silver iodide composite (Ag@AgI / CdWO) modified by cadmium tungstate prepared in Example 2 4 ), denoted as AICW-1.

Embodiment 3

[0070] A silver / silver iodide composite material modified by cadmium tungstate, which is basically the same as the silver / silver iodide composite material modified by cadmium tungstate of Example 1, the difference being: the silver / silver iodide composite material modified by cadmium tungstate of embodiment 3 Among them, the mass percentage of Ag nanoparticles is 1.3%, the mass percentage of silver iodide is 83.4%, and the mass percentage of cadmium tungstate is 15.3%.

[0071] A kind of preparation method of the silver / silver iodide composite material modified by the cadmium tungstate of the above-mentioned present embodiment is basically the same as the preparation method of the silver / silver iodide composite material modified by the cadmium tungstate of embodiment 1, the difference is: embodiment 3 CdWO in step (2) 4 The dosage is 100 mg.

[0072] The silver / silver iodide composite (Ag@AgI / CdWO) modified by cadmium tungstate prepared in embodiment 3 4 ), denoted as AICW-2...

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Abstract

The invention discloses a cadmium tungstate-modified silver / silver iodide composite material and its preparation method and application. The composite material includes cadmium tungstate and silver / silver iodide materials. The silver / silver iodide material is loaded on cadmium tungstate, and the silver / silver iodide material is loaded on the cadmium tungstate. The material consists of Ag nanoparticles and silver iodide. The preparation method includes: preparation of silver iodide / cadmium tungstate and in-situ photoreduction to prepare Ag@AgI / CdWO 4 composite materials. The composite material of the present invention has the advantages of wide absorption range of visible light, high absorption intensity, high photogenerated charge conduction and separation efficiency, good photocatalytic performance, strong stability and resistance to photocorrosion, and its preparation method has the advantages of easy control of reaction conditions and easy operation. The method is simple, does not use any organic solvents, has no secondary pollution, and has good environmental benefits. When the composite material is used to treat dye wastewater and antibiotic wastewater, it has high removal rate, fast removal rate, easy operation, low cost, and non-toxicity. Sub-pollution and other advantages.

Description

technical field [0001] The invention belongs to the field of material preparation and environmental protection, and relates to a silver / silver iodide composite material and its preparation method and application, in particular to a silver / silver iodide composite material modified with cadmium tungstate and its preparation method and application. Background technique [0002] With the development of the economy, energy and environmental issues have become increasingly prominent. Semiconductor photocatalysis technology is considered to be one of the most promising methods to solve environmental and energy problems because it can realize the conversion from solar energy to chemical energy. Traditional photocatalyst TiO 2 Due to its high UV photocatalytic activity, environmental friendliness and chemical stability, it is regarded as a photocatalytic material with good production capacity and application prospects for environmental remediation. However, due to TiO 2 The band ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138B01J35/10B01J37/03B01J37/34B01J37/16C02F1/30C02F101/30C02F101/34C02F101/38C02F103/34
CPCC02F1/30B01J27/138B01J37/031B01J37/16B01J37/343C02F2103/343C02F2101/34C02F2101/38C02F2101/30C02F2101/308C02F2305/10B01J35/612B01J35/633B01J35/647B01J35/39
Inventor 袁兴中吴志斌曾光明蒋龙波张进熊婷王侯夏琦于瀚博
Owner HUNAN UNIV
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