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Preparation method of a silver silicate/attapulgite composite catalyst responsive to visible light

A technology of attapulgite and silver silicate, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of low utilization efficiency of visible light, lack of visible light catalytic performance, and reduced catalytic efficiency. Achieve the effects of improving the utilization efficiency of visible light, improving the utilization rate of sunlight, and expanding the scope of application

Active Publication Date: 2021-07-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have carried out a lot of work in this field and achieved beneficial research results, there are still technical problems that need to be solved: 1) The utilization efficiency of visible light is low
Transition metal oxides such as titanium dioxide and zinc oxide have a high band gap and can only absorb ultraviolet light. However, the ultraviolet light component in sunlight is less than 5%, so an external ultraviolet light source must be used, which will undoubtedly increase the cost and make it difficult to promote.
The surface photogenerated carrier density of semiconductor photocatalysts such as titanium dioxide is insufficient, which reduces the catalytic efficiency
3) Insufficient adsorption capacity for organic species
[0004] Attapulgite has its special layer chain nanopore structure, high specific surface area, good adsorption performance and ion exchange performance, but it has no absorption in the visible light region and does not have visible light catalytic performance.

Method used

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  • Preparation method of a silver silicate/attapulgite composite catalyst responsive to visible light
  • Preparation method of a silver silicate/attapulgite composite catalyst responsive to visible light
  • Preparation method of a silver silicate/attapulgite composite catalyst responsive to visible light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 10 g of attapulgite, add 100 ml of 1mol / L hydrochloric acid, ultrasonicate at 50°C for 12 h, filter, wash until neutral, and dry to obtain acidified attapulgite; then use 100 ml of 1mol / L sodium hydroxide , sonicate at 50°C for 12 h, filter, wash until neutral, and dry; finally, under nitrogen atmosphere, bake at 400°C for 1 h, cool to room temperature, and obtain modified attapulgite;

[0035] Weigh 1.0g of modified attapulgite, dissolve it in 100 mL of pure water, and ultrasonically disperse to form a uniform suspension, add 0.1275g of silver nitrate, and fully stir for ion adsorption in the dark for 4 hours to obtain a mixed solution;

[0036] Weigh 0.107g of sodium silicate, dissolve it in 70 ml of pure water, and sonicate for 0.5 h to obtain a uniform solution; then slowly add it dropwise to the above mixed solution at a pump speed of 30 mp; then stir at room temperature for 3 h, filter, and precipitate The material was washed with pure water and dried to obt...

Embodiment 2

[0038] Weigh 0.5 g of the modified attapulgite prepared in Example 1, dissolve it in 100 ml of pure water, and ultrasonically disperse to make a uniform suspension; add 0.255 g of silver nitrate, fully stir in the dark for ion exchange and Adsorbed for 8 h to obtain a mixed solution;

[0039] Weigh 0.142g of sodium silicate, dissolve it in 70 ml of pure water, ultrasonicate for 0.5 h to obtain a uniform solution, then slowly add it dropwise to the above mixed solution at a pump speed of 25 rpm, then stir at room temperature for 2 h, filter, The precipitate was washed with pure water and dried to obtain a silver silicate / attapulgite composite photocatalyst material, which was designated as ATP-ASO-2. The composite photocatalyst has a degradation rate of 73% for chloroform.

Embodiment 3

[0041] Weigh 1.0 g of the modified attapulgite prepared in Example 1, dissolve it in 100 ml of pure water, and ultrasonically disperse it to make a uniform suspension; add 0.51 g of silver nitrate, and fully stir in the dark for ion exchange and adsorption12 h, to obtain a mixed solution;

[0042] Weigh 0.284 g of sodium silicate, dissolve it in 70 ml of pure water, sonicate for 0.5 h to obtain a uniform solution, then slowly add it dropwise to the above mixed solution at a pump speed of 20 rpm, then stir at room temperature for 1 h, filter, and precipitate The material was washed with pure water and dried to obtain a silver silicate / attapulgite composite photocatalyst, which was designated as ATP-ASO-3. The composite photocatalyst material has a degradation rate of 92% for chloroform.

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Abstract

The invention provides a preparation of a silver silicate / attapulgite composite catalyst responding to visible light, using attapulgite as a carrier, silver nitrate and sodium silicate as raw materials, and Ag by ion exchange or adsorption. + It is stored in attapulgite rods, and then reacted with sodium silicate by chemical precipitation method. On the basis of maintaining the attapulgite rod-like structure, it is obtained by uniformly growing nano-silver silicate particles on its surface. The invention makes full use of the unique structural features of the attapulgite to increase the contact area between the composite catalyst and pollutants, and at the same time utilizes silver silicate to have better absorption capacity in the visible light range, fully exerts its nano-effect and photocatalytic activity, and significantly improves the performance of the material. The high visible light utilization efficiency and the degradation rate of organic pollutants can have good application prospects and economic benefits in water treatment, and at the same time broaden the application field of attapulgite.

Description

technical field [0001] The invention relates to a composite photocatalyst, in particular to a preparation method of a silver silicate / attapulgite composite photocatalyst responding to visible light, which is mainly used as an effective photocatalytic component for the removal of trace organic matter in water bodies and belongs to the photocatalytic environment Pollution control technology field. Background technique [0002] With the acceleration of industrialization and urbanization, a large amount of industrial wastewater and domestic sewage are produced, resulting in varying degrees of pollution of drinking water sources, and the accumulation of trace organic matter in water is increasing. However, the traditional drinking water purification process cannot effectively remove trace organic matter in drinking water. Judging from the current status and development trend of advanced treatment technology for micro-organic pollution in drinking water sources at home and abroad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J37/03B01J37/08B01J37/34C02F1/30C02F101/30
CPCC02F1/30B01J23/50B01J37/035B01J37/08B01J37/343C02F2101/30C02F2305/10B01J35/39
Inventor 王丽娜齐彦兴杨敏王爱勤牟斌
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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