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Preparation method of hierarchical porous iron-titanium dioxide/ZSM-5 molecular sieve

A ZSM-5, titanium dioxide technology, applied in the direction of titanium dioxide, catalyst activation/preparation, titanium oxide/hydroxide, etc., can solve the problem of limited regeneration adsorption capacity, insufficient to meet green, environmental protection, high efficiency, secondary pollution and other problems, Achieve the effects of green materials, high synthesis efficiency and mild conditions

Pending Publication Date: 2021-01-26
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional adsorption method is prone to secondary pollution, and the regenerative adsorption capacity is limited. Simple adsorption is not enough to meet the requirements of green, environmental protection and efficient treatment.

Method used

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  • Preparation method of hierarchical porous iron-titanium dioxide/ZSM-5 molecular sieve
  • Preparation method of hierarchical porous iron-titanium dioxide/ZSM-5 molecular sieve
  • Preparation method of hierarchical porous iron-titanium dioxide/ZSM-5 molecular sieve

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Effect test

Embodiment 1

[0058] The preparation method of a kind of hierarchical porous iron-titanium dioxide / ZSM-5 molecular sieve of the present invention is specifically implemented according to the following steps:

[0059] Step 1, preparation of clear and transparent TiO 2 Gel, specifically: at 20°C, add 1.0g of ethyl titanate to 50ml of absolute ethanol, stir vigorously at a speed of 30rad / min for 30min to make it evenly mixed, and then add dropwise to it with a mass concentration of 15% boric acid solution and 15ml deionized water, then continue to stir vigorously for 3h, and stand at 20°C for 4h to obtain TiO 2 gel;

[0060] Step 2, fully contacting attapulgite with nitric acid and sodium hydroxide solution respectively, uniformly dispersed, and grinding to obtain amorphous silicon source powder; specifically:

[0061] Step 2.1, mix 1g of powdered natural attapulgite and 8ml of sodium hydroxide solution with a mass fraction of 10% evenly, mix and stir at 95°C for 2.5h, centrifuge after full ...

Embodiment 2

[0078] The preparation method of a kind of hierarchical porous iron-titanium dioxide / ZSM-5 molecular sieve of the present invention is specifically implemented according to the following steps:

[0079] Step 1, preparation of clear and transparent TiO 2 Gel, specifically: at 15°C, add 3.0g of ethyl titanate to 100ml of absolute ethanol, use a 500ml three-neck flask to dissolve and stir, the stirring speed is 18rad / min, and the stirring time is 25min; use a burette to mix Add a boric acid solution with a concentration of 3.5% to the solution at a rate of 0.1d / s, add 20ml of deionized water, continue to react for 4h at a speed of 10rad / min, and then stand in an environment of 25°C for 3h to obtain TiO 2 gel system;

[0080] Step 2, fully contacting attapulgite with nitric acid and sodium hydroxide solution respectively, uniformly dispersed, and grinding to obtain amorphous silicon source powder; specifically:

[0081] Step 2.1, mix 2g of powdered natural attapulgite and 20ml o...

Embodiment 3

[0094] The preparation method of a kind of hierarchical porous iron-titanium dioxide / ZSM-5 molecular sieve of the present invention is specifically implemented according to the following steps:

[0095] Step 1, preparation of clear and transparent TiO 2 Gel, specifically: add 1.8g of ethyl titanate to 50ml of absolute ethanol at 40°C, use a 500ml three-neck flask to dissolve and stir, the stirring speed is 20rad / min, and the stirring time is 20min; 5% boric acid solution was added at a rate of 0.5d / s, and 20ml of deionized water was added, and the reaction was continued for 3h at a speed of 18rad / min, and then stood at 25°C for 4h to obtain TiO 2 gel system;

[0096] Step 2, fully contacting attapulgite with nitric acid and sodium hydroxide solution respectively, uniformly dispersed, and grinding to obtain amorphous silicon source powder; specifically:

[0097] Step 2.1, mix 5g of powdery natural attapulgite and 100ml of sodium hydroxide solution with a mass concentration of...

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Abstract

The invention discloses a preparation method of a hierarchical porous iron-titanium dioxide / ZSM5 molecular sieve, which specifically comprises the following steps: by using attapulgite subjected to thermal activation modification as an amorphous silicon source, sodium metaaluminate as a supplementary aluminum source, tetrapropylammonium hydroxide as a template agent and polyethylene glycol 1000 asa mesoporous directing agent, adding TiO2 gel and ferric nitrate nonahydrate, and adopting a one-step hydrothermal method to directly synthesize the hierarchical porous Fe-TiO2 / ZSM5 molecular sieve.The hierarchical porous Fe-TiO2 / ZSM5 molecular sieve prepared by the invention can be used for synthesizing a photocatalytic material with strong photocatalytic performance, high photocatalytic efficiency, micro-mesoporous pore channels and large specific surface area, is simple to operate, green and environment-friendly, can be recycled for multiple times, and has a remarkable effect in a degradation process of treating methylene blue and rhodamine B in printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and in particular relates to a preparation method of a hierarchical porous iron-titanium dioxide / ZSM-5 molecular sieve. Background technique [0002] Due to its unique pore structure, high specific surface area and excellent hydrothermal stability, ZSM-5 molecular sieve has been widely used in petrochemical, environmental protection, fine chemical and other emerging fields of green chemical industry. As a typical representative of zeolite molecular sieve with MFI structure, ZSM-5 has "Z"-shaped channels parallel to the a-axis and straight channels parallel to the b-axis, and the larger straight channels are more conducive to the diffusion of small molecules. By adjusting the length of a-axis and b-axis, the grain morphology of ZSM-5 molecular sieve can be adjusted, thereby affecting its activity and selectivity. However, ZSM-5 molecular sieve has a single pore size and small ...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J35/10B01J37/10B01J37/08C01G23/047C01B39/40
CPCB01J29/46B01J37/10B01J37/08C01G23/047C01B39/40B01J2229/186B01J2229/40C01P2004/80C01P2002/72C01P2004/03B01J35/39B01J35/60B01J35/61B01J35/63B01J35/66
Inventor 李红玑陈立军许艳红张建民王改平
Owner XI'AN POLYTECHNIC UNIVERSITY
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