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Preparation method and application of micro-mesoporous molecular sieve diatomite composite used for adsorption process

A composite material and diatomite sieve technology, which is applied in other chemical processes, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of weakening mass diffusion restrictions, single molecular size matching, and slow mass diffusion in pores. Achieve the effects of reducing the effect of mass diffusion limitation, improving adsorption capacity, and enriching the pore system

Inactive Publication Date: 2017-01-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the perspective of pollutant adsorption and removal, there are still some problems: how to construct the surface of the material that can quickly adsorb pollutants, and weaken the mass diffusion limit inside the adsorbent; how to adjust the performance of the material to adsorb pollutants of different sizes and properties ; How to solve a series of problems such as single molecular size matching and slow mass diffusion in the pores of composite materials, these problems are important issues that functional adsorption materials need to pay attention to

Method used

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  • Preparation method and application of micro-mesoporous molecular sieve diatomite composite used for adsorption process

Examples

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example 1

[0033] a. Preparation of silicalite-1 molecular sieve seed crystals:

[0034] According to the molar ratio TPAOH:SiO 2 :H 2 The ratio of O:EtOH=9:25:480:100, namely TPAOH37.94g, TEOS27.10g, H 2 O16.49g, stirred for 24h, refluxed in an oil bath at 100°C for 48h to obtain seed crystals, took 0.5g seed crystals and dispersed them in 100ml water to make a zeolite solution with a mass fraction of 0.5%, adjusted the pH value to 10, at this time silicalite-1 seed crystals The solution is negatively charged;

[0035] b. Diatomite purification and electrical modification:

[0036] Soak 4g of diatomite in 100ml of 0.2% PDDA solution by volume fraction, wash with 0.1mol / L ammonia water several times to remove excess electrolyte, and dry with slight heat. At this time, the diatomite changes from negative charge to positive charge.

[0037] c. Diatomite adsorption seed:

[0038] The diatomite after electrical modification in step b was oscillated and adsorbed in the zeolite solution o...

example 2

[0045] a. Preparation of silicalite-1 molecular sieve seed crystals:

[0046] According to the molar ratio TPAOH:SiO 2 :H 2 The ratio of O:EtOH=9:25:480:100, namely TPAOH37.94g, TEOS27.10g, H 2 O16.49g, stirred for 24h, refluxed in an oil bath at 100°C for 48h to obtain seed crystals, took 0.5g seed crystals and dispersed them in 100ml water to make a zeolite solution with a mass fraction of 0.5%, adjusted the pH value to 10, at this time the silicalite-1 seed crystals The solution is negatively charged;

[0047] b. Diatomite purification and electrical modification:

[0048] Soak 4g of diatomite in 100ml of 0.2% PDDA solution by volume fraction, wash with 0.1mol / L ammonia water several times to remove excess electrolyte, and dry it with slight heat. At this time, the diatomite turns from negative charge to positive charge.

[0049] c. Diatomite adsorption seed:

[0050]The diatomite after electrical modification in step b was oscillated and adsorbed in the zeolite soluti...

example 3

[0057] a. Preparation of silicalite-1 molecular sieve seed crystals:

[0058] According to the molar ratio TPAOH:SiO 2 :H 2 The ratio of O:EtOH=9:25:480:100, namely TPAOH37.94g, TEOS27.10g, H 2 O16.49g, stirred for 24h, refluxed in an oil bath at 100°C for 48h to obtain seed crystals, took 0.5g seed crystals and dispersed them in 100ml water to make a zeolite solution with a mass fraction of 0.5%, adjusted the pH value to 10, at this time silicalite-1 seed crystals The solution is negatively charged;

[0059] b. Diatomite purification and electrical modification:

[0060] Soak 4g of diatomite in 100ml of 0.2% PDDA solution by volume fraction, wash with 0.1mol / L ammonia water several times to remove excess electrolyte, and dry with slight heat. At this time, the diatomite changes from negative charge to positive charge.

[0061] c. Diatomite adsorption seed:

[0062] The diatomite after electrical modification in step b was oscillated and adsorbed in the zeolite solution o...

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Abstract

The invention utilizes a layer-by-layer secondary growth method for enabling a molecular sieve to be assembled to diatomite. A special template agent containing CTAB enables mesopores to be produced inside crystals of the surface of the molecular sieve in a molecular sieve assembling and growing process, mass diffusion and limiting influence in an adsorption process are reduced, and adsorption advantages of micropores are maintained. The obtained product has a skeleton structure and macropores of diatomite, micropores of the molecular sieve and introduced mesopores, strong adsorption capability, rapid hole diffusion process and good surface hydrophobic property, and pore diameter ratio and type of the molecular sieve can be adjusted according to different pollutants. The preparation method provided by the invention is simple in process and operation, a preparation period is short, requirement on instrument is low, sample stability is high, and the prepared composite has a broad application prospect in the field of water pollutant treatment.

Description

[0001] Technical field: [0002] The invention relates to a preparation method and application of a micro-mesoporous molecular sieve diatomite composite material used in an adsorption process, and belongs to the field of sewage treatment. [0003] Background technique: [0004] Advanced sewage treatment, reuse process, and water purification process all involve adsorption process. At present, commonly used adsorbents such as activated carbon and resin have limitations such as low adsorption capacity, difficult regeneration, and high cost. The preparation of functional adsorbent materials has broad application prospects in the treatment of water pollution. Zeolite molecular sieve is an inorganic porous material with selective adsorption and catalytic properties. It has been widely used in the treatment of air and water pollutants in the environmental field. However, its application is limited due to high cost and easy agglomeration. Diatomaceous earth is a kind of non-metallic ...

Claims

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Application Information

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IPC IPC(8): B01J20/18C02F1/28B01J20/30C02F101/34
CPCB01J20/18B01J20/12C02F1/288C02F2101/345
Inventor 黄卫民林海波邢恩东
Owner JILIN UNIV
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