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Preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde

A technology for composite silica and formaldehyde adsorption, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve problems such as poor stability, automatic analysis, and lack of specificity in activated carbon adsorption, and achieve No secondary pollution, specificity improvement effect

Inactive Publication Date: 2019-01-18
YANTAI ENG & TECH COLLEGE YANTAI TECHNICIAN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing indoor formaldehyde treatment adsorption method, which is similar to the lack of specificity of activated carbon adsorption, and the poor stability will easily cause the problem of automatic analysis and re-release of formaldehyde after adsorption, and proposes an adsorbable Preparation method of formaldehyde composite silica airgel

Method used

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  • Preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde
  • Preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde
  • Preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: A kind of preparation method of the composite silica airgel that can adsorb formaldehyde comprises the following steps:

[0032]S1, measure 60-65ml tetraethyl orthosilicate (C 8 h 12 o 8 Si) In the Erlenmeyer flask, add 50ml of absolute ethanol to the Erlenmeyer flask at room temperature to mix evenly;

[0033] S2. Add 3-5g of chitosan powder to the mixed solution in S1, seal the mouth of the conical flask with a sealing film to prepare airtight reaction conditions, and use a stirring device to continuously stir the mixed solution in the conical flask. , the stirring time is 10-12h;

[0034] S3. While stirring the mixed solution, dropwise add 2.0-3.0ml of HF solution with a mass fraction of 5% to the mixed solution, continuously drop it for 14-16min, then seal it and let it stand for 10-12h, and get Translucent chitosan-silica composite gel;

[0035] S4, take out the chitosan-silicon dioxide composite gel prepared in S3, soak and wash the composite ge...

Embodiment 2

[0044] Embodiment 2: Based on Example 1 but differently, with high molecular chitosan (viscosity average molecular weight 200kDa) as raw material, 3g high molecular chitosan and 60ml tetraethyl orthosilicate (C 8 h 12 o 8 Si) was mixed according to the proportion to prepare a sealed reaction environment, and further pretreated the translucent composite airgel. After pretreatment, 10ml of epichlorohydrin, 8 drops of 70% perchloric acid and 200ml of Amino-modified polymer chitosan-silicon dioxide composite gel can be prepared by mixing the absolute ethanol evenly, and the amino-modified polymer chitosan-silicon dioxide composite gel is further acidified, and finally formaldehyde is used to The dynamic adsorption device analyzes the formaldehyde adsorption performance of the polymer composite gel. The measured results show that the maximum formaldehyde adsorption capacity of the polymer chitosan-silica composite airgel (MCSA) is 0.111mg / g, mainly Due to the higher viscosity-ave...

Embodiment 3

[0045] Embodiment 3: Based on Example 1 but differently, using low-molecular chitosan (viscosity-average molecular weight 3kDa) as raw material, 63ml tetraethyl orthosilicate and 4g are mixed to prepare a sealed reaction environment, and further The prepared translucent composite airgel is pretreated. After the pretreatment, use 12ml of epichlorohydrin, 9 drops of 70% perchloric acid and 220ml of dehydrated alcohol to mix evenly, and the amino-modified low Molecular chitosan-silicon dioxide composite gel, further acidify the amino-modified low-molecular-weight chitosan-silicon dioxide composite gel, add 10ml of ethylenediamine and 40ml of absolute ethanol to the composite gel Mix, mix evenly and soak in acetic acid to prepare low molecular chitosan-silica composite aerogel (LMWCSA), use formaldehyde dynamic adsorption device to analyze the formaldehyde adsorption performance of low molecular composite gel, low molecular weight The maximum formaldehyde scavenging rate of chitos...

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Abstract

The invention discloses a preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde and belongs to the field of aerogel application. The existing porous adsorption material similar to activated carbon has no specificity for adsorption of formaldehyde and has poor stability, thereby being easy to cause automatic desorption and re-release of formaldehyde after adsorption. Therefore, the invention adopts a sol-gel method which is characterized in that under the condition of room temperature, chitosan serving as a raw material is subjected to nano-scale combinationwith silicon dioxide; in the reaction process, the opening of a conical flask is tightly sealed by a sealing membrane to obtain a sealed reaction condition, thereby being favorable for reacting; and further, acidification and amination modification are performed. The obtained modified gel has higher amino content, contains active groups such as alkyl, hydroxyl and amino of chitosan, and has greatly enhanced specificity for adsorption of formaldehyde. Furthermore, the adsorption material is environment-friendly, can not cause secondary pollution, has good stability, and has no phenomena of automatic desorption and re-release of formaldehyde.

Description

technical field [0001] The invention relates to the application field of airgel, in particular to a preparation method of a composite silica airgel capable of absorbing formaldehyde. Background technique [0002] Airgel usually refers to a lightweight nano-solid material that aggregates nanoscale ultrafine particles to form a nanoporous network structure, and is filled with a gaseous dispersion medium in the network pores. Airgel is ubiquitous in petroleum, chemical and metallurgical industries. . The most common airgel is silica aerogel. Silica aerogel is a lightweight nanoporous amorphous solid material with excellent thermal insulation properties. It is used in pipelines, furnaces and other thermal equipment Among them, silica airgel and composite materials replace traditional insulation materials to insulate them, which can greatly reduce heat energy loss and improve heat energy utilization efficiency. [0003] Formaldehyde is one of the well-known indoor gas pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01D53/02B01J20/28B01J20/30
CPCB01D53/02B01D2257/708B01J20/103B01J20/24B01J20/28047
Inventor 张婷婷洪卉李媛陈健
Owner YANTAI ENG & TECH COLLEGE YANTAI TECHNICIAN INST
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