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Diatomite-based porous composite material for adsorbing volatile organic pollutants and preparation method thereof

A volatile organic and composite material technology, applied in separation methods, chemical instruments and methods, inorganic chemistry, etc., to achieve the effects of low reaction temperature, increased content, increased specific surface area and pore volume

Active Publication Date: 2013-05-08
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the existing volatile organic pollutant adsorbents in the prior art in the preparation and use, to provide a kind with large specific surface and pore volume, high hydrophobicity and thermal stability, etc., A diatomite-based porous composite material with high adsorption capacity for volatile organic pollutants, such as n-hexane, benzene, toluene, and o-xylene, and a preparation method thereof. The preparation method has the advantages of simple process and short preparation cycle , low energy consumption, low pollution, etc.

Method used

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  • Diatomite-based porous composite material for adsorbing volatile organic pollutants and preparation method thereof
  • Diatomite-based porous composite material for adsorbing volatile organic pollutants and preparation method thereof
  • Diatomite-based porous composite material for adsorbing volatile organic pollutants and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 1) 5 g of Jilin diatomite purified by sedimentation (the main diatom species is diatom of Cylindrocephalus, SiO 2 85.78% by mass) was added to 100 mL of NaOH solution with pH=10, fully stirred at 60 °C for 4 h, and the suspension was separated into solid-liquid by centrifugation. Dry to constant weight.

[0031] 2) Soak the solid dried to constant weight obtained in step 1) in 100 mL of a polydimethyldiallyl ammonium chloride solution with a mass fraction of 0.5 wt % for 20 minutes, and centrifuge the suspension. Solid-liquid separation was performed, and the solid portion was washed 4 times with water.

[0032] 3) The solid obtained after washing in step 2) is placed in 100 mL of Silicalite-1 zeolite sol with a concentration of 1.5 wt% and a pH of 9.5 (a hydrosol of Silicalite-1 nanocrystals with an average particle size of about 78 nm) to soak and deposit. After 20 minutes, the suspension was subjected to solid-liquid separation by centrifugation, and the obtained s...

Embodiment 2

[0038] 1) Add 5g of Jilin diatomite purified by sedimentation (same as the diatomite used in Example 1) into 100mL of NaOH solution with pH=13.5, fully stir at 25°C for 72h, and centrifuge the suspension. Solid-liquid separation was performed, and the separated solid was washed 4 times with water and then dried at 80° C. to constant weight.

[0039] 2) Soak the solid dried to constant weight obtained in step 1) in 100 mL of polydimethyldiallyl ammonium chloride solution with a mass fraction of 0.5 wt % for 20 minutes, and use the centrifugal method to solidify the suspension. The liquid was separated, and the solid portion was washed 4 times with water.

[0040] 3) The solid obtained after washing in step 2) is placed in 100 mL of Silicalite-1 zeolite sol with a concentration of 1.5 wt% and a pH of 9.5 (a hydrosol of Silicalite-1 nanocrystals with an average particle size of about 78 nm) to soak and deposit. After 20 minutes, the suspension was subjected to solid-liquid separ...

Embodiment 3

[0047] 1) Add 5g of Jilin diatomite purified by sedimentation (same as the diatomite used in Example 1) into 100mL of NaOH solution with pH=13.5, fully stir at 25°C for 72h, and centrifuge the suspension. Solid-liquid separation was performed, and the separated solid was washed 4 times with water and then dried at 80° C. to constant weight.

[0048] 2) Soak the solid dried to constant weight in step 1) in 100 mL of polydimethyldiallyl ammonium chloride solution with a mass fraction of 0.5 wt % for 20 minutes, and centrifuge the suspension for solid-liquid separation. Separated and the solid portion was washed 4 times with water.

[0049] 3) Soak the solid obtained after washing in step 2) in 100 mL of Silicalite-1 zeolite sol with a mass fraction of 1.5 wt% and a pH of 9.5 (a hydrosol of Silicalite-1 nanocrystals with an average particle size of about 78 nm). After sedimentation for 20 minutes, the suspension was subjected to solid-liquid separation by centrifugation, and the...

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Abstract

The invention discloses a diatomite-based porous composite material for adsorbing volatile organic pollutants and a preparation method thereof. Diatomaceous silica in diatomite is denuded by using a strong alkali solution, so that the diameter of the large pores / mesopores of silica is increased, and micropores are formed, thereby increasing the porosity; then, a nano zeolite seed crystal is loaded on the surface of silica, and the nano zeolite seed crystal grows to a dense zeolite film through hydro-thermal treatment. Because the growth of zeolite uses an external silicon source, a small amount of aluminum contained in diatomite does not enter a zeolite skeleton, and formed zeolite is high-hydrophobicity pure silicon zeolite. Due to the bearizing function of alkali, the zeolite film does not block large pore structures in the diatomite. The prepared diatomite-based porous composite material still keeps the unique macroporous skeleton of diatomite and contains rich zeolite microcellular structures. The material is large in specific surface area and pore volume and high in hydrophobicity and thermal stability, and has a high adsorption capacity to volatile organic pollutants such as n-hexane, benzene, toluene and o-xylene and the like.

Description

Technical field: [0001] The invention relates to a diatomite-based porous composite material and a preparation method thereof, in particular to a diatomite-based porous composite material for adsorbing volatile organic pollutants and a preparation method thereof. Background technique: [0002] Volatile organic pollutants refer to organic pollutants with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point of less than 260°C under normal pressure, mainly including hydrocarbons, oxygen hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons and sulfur hydrocarbons, etc. ( Li Guowen et al., Journal of Xi'an University of Architecture and Technology, 1998), is the most common pollutant emitted by petrochemical, pharmaceutical, printing, building materials, spraying and other industries. Most volatile organic pollutants are not only toxic and odorous, but also can produce teratogenic, mutagenic and carcinogenic effects, and can also be used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01J20/28B01D53/02
Inventor 袁鹏于文彬刘冬袁巍巍何宏平朱建喜
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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