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Preparation method of diatomite/molecular sieve composite material for adsorbing volatile organic pollutants

A technology of volatile organic and composite materials, applied in the direction of separation methods, chemical instruments and methods, silicate, etc., can solve the problems of unfavorable multi-component VOCs adsorption, increase the cost of pollutant treatment, and reduce the adsorption efficiency, etc., to achieve beneficial Effect of specific surface area and pore volume, increase of specific surface area and pore volume, and increase of loading rate

Inactive Publication Date: 2019-02-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the industrial application of nano-zeolite molecular sieve materials: (1) the single pore size distribution causes nano-zeolite molecular sieve to only have adsorption effect on small-molecule VOCs of a certain size, which is not conducive to the adsorption of multi-component VOCs; The problem of agglomeration among zeolite particles will also reduce the adsorption efficiency and increase the cost of pollutant treatment
Diatomite is very rich in reserves in my country, and has the characteristics of large pore volume and good chemical stability. It is a promising environmental adsorption material, but a single diatomite also has the limitation of low adsorption efficiency.

Method used

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  • Preparation method of diatomite/molecular sieve composite material for adsorbing volatile organic pollutants
  • Preparation method of diatomite/molecular sieve composite material for adsorbing volatile organic pollutants
  • Preparation method of diatomite/molecular sieve composite material for adsorbing volatile organic pollutants

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Effect test

Embodiment 1

[0035] 1) Add 56ml of ethyl orthosilicate, 73ml of tetrapropylammonium hydroxide aqueous solution (25%) and 31ml of water into a beaker, stir for 12 hours, put it into a hydrothermal reactor, and set it at 100°C for 4 days. After the reaction was completed, the supernatant was removed by centrifugation, and distilled water was added to wash the remaining solid until the supernatant was neutral. After centrifugation, the solid was dried at 60°C. Then it was calcined in a muffle furnace at 550° C. for 6 hours in an air atmosphere to obtain a solid nano-Silicalite-1.

[0036]2) Add 5g of diatomaceous earth into 100ml of 6M hydrochloric acid solution, and stir in a water bath at 60°C for 4 hours. Afterwards, filter with suction, wash the solid with water until the supernatant is neutral, and dry at 60°C.

[0037] 3) Add the diatomite treated in step 2) into 100 ml of sodium hydroxide solution with pH=13.5, and stir in a water bath at 60° C. for 4 hours. Afterwards, filter with s...

Embodiment 2

[0044] 1) Add 56ml of ethyl orthosilicate, 73ml of tetrapropylammonium hydroxide aqueous solution (25%) and 31ml of water into a beaker, stir for 12 hours, put it into a hydrothermal reactor, and set it at 100°C for 4 days. After the reaction was completed, the supernatant was removed by centrifugation, and distilled water was added to wash the remaining solid until the supernatant was neutral. After centrifugation, the solid was dried at 60°C. Then it was calcined in a muffle furnace at 550° C. for 6 hours in an air atmosphere to obtain a solid nano-Silicalite-1.

[0045] 2) Add 5g of diatomaceous earth into 100ml of 6M hydrochloric acid solution, and stir in a water bath at 60°C for 4 hours. Afterwards, filter with suction, wash the solid with water until the supernatant is neutral, and dry at 60°C.

[0046] 3) Add the diatomite treated in step 2) into 100 ml of sodium hydroxide solution with pH=13.5, and stir in a water bath at 60° C. for 4 hours. Afterwards, filter with ...

Embodiment 3

[0053] 1) Add 56ml of ethyl orthosilicate, 73ml of tetrapropylammonium hydroxide aqueous solution (25%) and 31ml of water into a beaker, stir for 12 hours, put it into a hydrothermal reactor, and set it at 100°C for 4 days. After the reaction was completed, the supernatant was removed by centrifugation, and distilled water was added to wash the remaining solid until the supernatant was neutral. After centrifugation, the solid was dried at 60°C. Then it was calcined in a muffle furnace at 550° C. for 6 hours in an air atmosphere to obtain a solid nano-Silicalite-1.

[0054] 2) Add 5g of diatomaceous earth into 100ml of 6M hydrochloric acid solution, and stir in a water bath at 60°C for 4 hours. Afterwards, filter with suction, wash the solid with water until the supernatant is neutral, and dry at 60°C.

[0055] 3) Add the diatomite treated in step 2) into 100 ml of sodium hydroxide solution with pH=13.5, and stir in a water bath at 60° C. for 4 hours. Afterwards, filter with ...

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Abstract

The invention discloses a preparation method of a diatomite / molecular sieve composite material for adsorbing volatile organic pollutants. The preparation method is characterized in that diatomite as asuperior mineral resource of Jilin province is taken as a raw material, and the surface and pores of the diatomite are modified by using strong acid and strong alkali, so that the purity of the diatomite is improved, and the aperture is enlarged through dissolution so as to prevent the pores from being blocked and improve the zeolite load rate. Then, a nano zeolite seed crystal is loaded on the surface of the modified diatomite, and a dense nano zeolite membrane further grows on the surface of the diatomite through hydrothermal treatment. Compared with original diatomite, the prepared diatomite / molecular sieve composite material has the advantages of great improvement on the aspects of specific surface area and pore volume, and good adsorption effect on volatile organic pollutants such asacetone, ethyl acetate and methylbenzene. As proved by the experiment result, the diatomite / molecular sieve composite material has the advantages of selective adsorption. Moreover, the material can be widely applied to industrial production by being prepared into particle adsorbents with clay.

Description

technical field [0001] The invention relates to a preparation method of diatomite / molecular sieve composite material, in particular to a preparation method of diatomite compounded with Silialite-1 and Beta molecular sieve, which is used for adsorbing volatile organic pollutants. Background technique [0002] In recent years, with the acceleration of industrial development and urbanization, the problem of air pollution has become increasingly serious, and a series of serious environmental and human health problems caused by volatile organic compounds (Volatile Organic Compounds, VOCs) have attracted widespread attention worldwide. On the one hand, VOCs emitted into the atmosphere can induce environmental pollution such as smog; on the other hand, prolonged exposure to a certain dose of VOCs may cause respiratory or hematopoietic diseases. [0003] There are many ways to deal with VOCs currently, mainly including destruction technology and recovery technology, including absorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/02
CPCB01D53/02B01D2253/106B01D2257/708B01J20/14B01J20/16
Inventor 康春莉刘芳田涛
Owner JILIN UNIV
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