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Preparation method and application of attapulgite composite photocatalyst

A technology of attapulgite and composite light, which is applied in the application field of photocatalytic synthesis of ammonia, can solve the problems of low photocatalytic efficiency and poor visible light response ability, and achieve the effects of simple synthesis method, energy saving and improved catalytic activity

Active Publication Date: 2018-09-04
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural attapulgite clay has poor visible light response ability and low photocatalytic efficiency. In order to make it realize visible light response and improve catalytic efficiency, it needs to be artificially modified, doped, loaded, etc., so that it can be better applied in Photocatalytic ammonia synthesis technology field

Method used

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  • Preparation method and application of attapulgite composite photocatalyst
  • Preparation method and application of attapulgite composite photocatalyst
  • Preparation method and application of attapulgite composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, weigh 2g of attapulgite and dissolve it in 100ml of 3mol / L hydrochloric acid solution, ultrasonically dissolve it, place it in a water bath, treat it at 70°C for 10 hours, and filter it with a circulating vacuum pump. Dry at ℃ for 16 hours to obtain the attapulgite pretreated product; then take 0.0015mol ferric chloride and place it in a 100mL beaker containing 50mL deionized water, stir and dissolve, add 1g of the above pretreated attapulgite, and stir again to dissolve , placed in a water bath at 70°C and stirred for 8 hours; finally, transfer the reaction solution in the beaker to a 100mL microwave hydrothermal reaction kettle at 160°C for 2 hours, and filter with a circulating vacuum pump. After drying for 16 hours, the iron oxide / modified attapulgite composite material was obtained, that is, 40% Fe 2 o 3 / ATP sample.

[0029] The iron oxide / modified attapulgite composite material prepared in this embodiment was subjected to X-ray powder diffraction experim...

Embodiment 2

[0032] First, weigh 2g of attapulgite and dissolve it in 100ml of 3mol / L hydrochloric acid solution, ultrasonically dissolve it, place it in a water bath, treat it at 70°C for 10 hours, and filter it with a circulating vacuum pump. Dry at ℃ for 15 hours to obtain the attapulgite pretreated product; then take 0.002mol ferric chloride and place it in a 100mL beaker containing 50mL deionized water, stir and dissolve, add 1g of the above pretreated attapulgite, and stir again to dissolve , placed in a water bath at 70°C and stirred for 8 hours; finally, transfer the reaction liquid in the beaker to a 100mL microwave hydrothermal reactor at 160°C for 3 hours, and then filter with a circulating vacuum pump. After drying for 18 hours, the iron oxide / modified attapulgite composite material was obtained, and the subsequent detection was as in Example 1.

Embodiment 3

[0034] First weigh 2g of attapulgite clay and dissolve it in 100mL of 3mol / L hydrochloric acid solution, put it in a water bath after ultrasonically dissolving, treat it at 70°C for 10h, and filter it with a circulating vacuum pump. Dry at 70°C for 16 hours to obtain the attapulgite clay pretreatment product; then take 0.003mol of ferric chloride and place it in a 100mL beaker containing 50mL of deionized water, stir to dissolve and add 1g of the attapulgite clay after the above pretreatment, Stir again to dissolve, put it in a water bath at 70°C and stir for 10 hours; finally, transfer the reaction solution in the beaker to a 100mL microwave hydrothermal reactor at 170°C for 3 hours, and then use a circulating vacuum pump to filter the filter cake. Dry at 70° C. for 16 hours to obtain the iron oxide / modified attapulgite composite material. Subsequent testing is as in Example 1.

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Abstract

The invention belongs to the technical field of photocatalysis synthesis of ammonia, and particularly relates to a preparation method and an application of a modified attapulgite / transition metal oxide nano composite. The preparation method comprises the steps of: (1) performing acid treatment on purified attapulgite clay, replacing part of cations in an attapulgite octahedral structure and part of cations between layers with H<+>, (2) putting the acidified attapulgite clay in a transition metal salt solution for sufficient reaction in a water bath at 60-100 DEG C, and (3) putting a reaction solution in a microwave hydrothermal chemical reactor for reaction, and then performing centrifugation, washing and drying to form a finished product. The modified attapulgite / transition metal oxide composite can serve as the catalyst and is applied to the field of the photocatalysis synthesis of ammonia; compared with the traditional industrial synthesis of ammonia, the preparation method is simple; and the energy consumption is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic ammonia synthesis, and in particular relates to a visible light responsive attapulgite and a transition metal oxide to construct a heterojunction nanomaterial as an active component, a preparation method and its application in photocatalytic ammonia synthesis. Background technique [0002] As an important inorganic chemical product, ammonia plays a pivotal role in national economic production. However, in industrial production, ammonia is synthesized by Haber-Bosh process under extreme conditions (673-873K, 20-40MPa). The industrial ammonia synthesis process consumes a lot of fossil fuels, which inevitably results in a large amount of CO 2 emission. Therefore, the reduction of nitrogen to ammonia (NH 3 ) is an urgent problem to be solved. [0003] The development of low-temperature, low-pressure, and high-efficiency catalysts is the key to reducing energy consumption in ammonia synthesis...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/10B01J37/34C01C1/04
CPCC01C1/0411B01J23/745B01J23/78B01J37/10B01J37/346B01J35/39Y02P20/52
Inventor 李霞章石海洋陆晓旺左士祥姚超罗士平刘文杰
Owner CHANGZHOU UNIV
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