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A kind of diatomite/allophane composite material with multi-level pore structure and its preparation method

A technology of allophane and pore structure, which is applied in the direction of aluminum silicate, separation methods, silicon compounds, etc., can solve the problems of poor thermal stability, single pore structure, complex preparation process, etc., and achieve low hydrothermal reaction temperature, specific The effect of large surface area and simple process

Active Publication Date: 2020-04-07
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to overcome the shortcomings of traditional organic gas adsorbents such as poor thermal stability, single pore structure, and complicated preparation process, and to provide a diatomite / allophane with multi-level pore structure that can be used to adsorb organic gases Composite material and its preparation method

Method used

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  • A kind of diatomite/allophane composite material with multi-level pore structure and its preparation method
  • A kind of diatomite/allophane composite material with multi-level pore structure and its preparation method
  • A kind of diatomite/allophane composite material with multi-level pore structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Add 10 g of diatomaceous earth to 2 L of aluminum chloride solution with a concentration of 0.1 M, and stir at room temperature for 1 h to obtain a suspension.

[0030] 2) Add 1.5 L of 0.1 M sodium orthosilicate solution to the suspension obtained in step 1) at a rate of 10 mL / min, and stir at room temperature for 1 h to obtain a mixture of diatomite and allophane precursor.

[0031] 3) The mixture obtained in step 2) was subjected to solid-liquid separation by centrifugation, and the separated solid was placed in a hydrothermal kettle, and reacted at 100° C. for 48 hours.

[0032] 4) The reaction product obtained in step 3) was centrifuged and washed until the supernatant was neutral, and then freeze-dried to obtain the diatomite / allophane composite material with a multi-level pore structure in this embodiment.

[0033] The crystal structure of the diatomite / allophane composite material with multi-level channel structure prepared in this example was analyzed by X-ra...

Embodiment 2

[0037] 1) Add 15 g of diatomaceous earth into 1.5 L of aluminum sulfate solution with a concentration of 0.05 M, and stir at room temperature for 2 h to obtain a suspension.

[0038] 2) Add 1.5 L of 0.05 M sodium orthosilicate solution to the suspension obtained in step 1) at a rate of 50 mL / min, and stir at room temperature for 2 h to obtain a mixture of diatomite and allophane precursor.

[0039] 3) The mixture obtained in step 2) was subjected to solid-liquid separation by centrifugation, and the separated solid was placed in a hydrothermal kettle, and reacted at 50° C. for 72 hours.

[0040] 4) The reaction product obtained in step 3) was centrifuged and washed until the supernatant was neutral, and then freeze-dried to obtain the diatomite / allophane composite material with a multi-level pore structure in this embodiment.

[0041] The morphology and structure of the diatomite / allophane composite material with a hierarchical pore structure prepared in this example were anal...

Embodiment 3

[0045] 1) Add 20 g of diatomaceous earth into 2 L of aluminum nitrate solution with a concentration of 0.03 M, and stir at room temperature for 3 h to obtain a suspension.

[0046] 2) 1 L of tetraethyl orthosilicate solution with a concentration of 0.03M was added to the suspension obtained in step 1) at a rate of 5 mL / min, and stirred at room temperature for 3 h to obtain a mixture of diatomite and allophane precursor.

[0047] 3) The mixture obtained in step 2) was subjected to solid-liquid separation by centrifugation, and the separated solid was placed in a hydrothermal kettle, and reacted at 150° C. for 24 hours.

[0048] 4) The reaction product obtained in step 3) was centrifuged and washed until the supernatant was neutral, and then freeze-dried to obtain the diatomite / allophane composite material with a multi-level pore structure in this embodiment.

[0049] image 3 is the nitrogen adsorption-desorption isotherm of the diatomite / allophane composite material with mult...

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Abstract

The invention discloses a diatomite / allophane composite material with multi-stage pore structure and a preparation method thereof. The composite material takes natural diatomite as a raw material, theallophane nanoparticles are uniformly supported on the surface of the diatomite by an in-situ hydrothermal method to prepare the diatomite / allophane composite material having a multi-stage pore structure. The composite material has the microporous / mesoporous / macroporous multi-stage pore structure, including micropores of allophane, mesopores formed on the inner surface of large pores of diatomiteafter allophane is loaded, and macropores of diatomite. The composite material also has a large specific surface area and a large total pore volume, and has excellent adsorption properties for organic gases such as benzene, toluene and n-hexane. The preparation method of the composite material has the characteristics of simple process, short preparation period and the like, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of organic gas treatment, and in particular relates to a diatomite / allophane composite material with a multi-level pore structure and a preparation method thereof. Background technique [0002] Organic gases are a kind of common air pollutants, which are widely sourced from petrochemical, leather manufacturing, printing, spraying, building materials, pharmaceuticals and other industries, mainly including hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons, oxygenated hydrocarbons, sulfur Cycloaromatic hydrocarbons, etc. (Li Guowen et al., Journal of Xi'an University of Architecture and Technology, 1998). Most of them are poisonous, foul-smelling, and will produce the "three causes" effects of carcinogenicity, teratogenicity, and mutagenicity. In addition, they can also act as precursors to produce photochemical smog, which is extremely harmful to environmental safety and human survival. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/02
CPCB01D53/02B01D2253/106B01D2257/7022B01D2257/7027B01J20/14B01J20/16B01J2220/42B01J2220/4806
Inventor 袁鹏邓亮亮刘冬
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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