Preparation method and application of dopamine/silicon dioxide composite aerogel

A technology of composite airgel and silica, which is applied in the direction of airgel preparation, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of increasing experimental costs and complicated preparation methods, and achieves low equipment requirements and high preparation process Simple, high adsorption capacity effect

Pending Publication Date: 2021-03-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the gelation process, an ice-water bath is required, the preparation method is more complicated, and the cost of the experiment is increased.

Method used

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  • Preparation method and application of dopamine/silicon dioxide composite aerogel
  • Preparation method and application of dopamine/silicon dioxide composite aerogel
  • Preparation method and application of dopamine/silicon dioxide composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0030] Examples 1-4: Effects of the feed ratio (molar ratio) of dopamine hydrochloride and tetraethyl orthosilicate on the performance of dopamine / silicon dioxide composite airgel to adsorb thiophene sulfides in simulated gasoline.

Embodiment 1

[0031] Embodiment 1: the dopamine / silicon dioxide composite airgel whose feeding ratio (molar ratio) of dopamine hydrochloride and tetraethyl orthosilicate is 1:25, its preparation method steps are as follows:

[0032] 1) Dissolve 0.271g of dopamine hydrochloride in 2ml of deionized water, then add 10ml of absolute ethanol and 8ml of ethyl orthosilicate in sequence, adjust the pH of the solution to about 2 with dilute hydrochloric acid solution, stir at room temperature for 1.5h to mix evenly and hydrolyze .

[0033] 2) Add 5% ammonia water dropwise to the solution obtained in step 1), adjust the pH of the solution to about 6, and let it stand at room temperature for 10 minutes to obtain a dopamine / silicon dioxide composite alcohol gel.

[0034] 3) Add 40ml of a mixed solution of tetraethyl orthosilicate and acetone with a volume ratio of 15:25 to the composite alcohol gel obtained in step 2), and place it in a water bath at 40°C for aging for 16 hours to strengthen the skelet...

Embodiment 2～4

[0039] Examples 2-4 Dopamine / silicon dioxide composite aerogels in which the feeding ratio (molar ratio) of dopamine hydrochloride to tetraethyl orthosilicate is 1:50, 1:100, and 1:150, respectively:

[0040] The preparation steps and penetration adsorption experiment were the same as in Example 1, except that the dopamine hydrochloride addition in Example 2 was 0.135g, the dopamine hydrochloride addition in Example 3 was 0.068g, and the dopamine hydrochloride addition in Example 4 was 0.045g.

[0041] Table 1 Effect of dopamine hydrochloride and tetraethyl orthosilicate feed ratio (molar ratio) on the performance of dopamine / silica composite airgel adsorption of thiophene sulfides in simulated gasoline

[0042]

[0043] It can be seen from Table 1 that with the decrease of dopamine hydrochloride and tetraethyl orthosilicate feed ratio (molar ratio), the penetration of dopamine / silica composite airgel to thiophene, benzothiophene and dibenzothiophene The adsorption capacity...

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Abstract

The invention discloses a preparation method and application of dopamine / silicon dioxide composite aerogel, and belongs to the technical field of fuel oil processing. The method takes tetraethoxysilane as a raw material, dopamine hydrochloride is introduced for modification, and the method comprises the specific steps: dissolving dopamine hydrochloride in water, adding tetraethoxysilane and absolute ethyl alcohol, stirring and hydrolyzing to obtain silica sol; adjusting the pH value of the silica sol, standing the gel, aging, grinding, washing, and drying under normal pressure to obtain dopamine / silicon dioxide composite aerogel; and quantitatively filling a fixed bed adsorption device with the prepared aerogel, injecting simulated gasoline containing thiophene sulfides, collecting the adsorbed simulated gasoline, and carrying out chromatographic analysis. The aerogel adsorbing material disclosed by the invention not only has good adsorption performance on the thiophene sulfides, but also has good adsorption selectivity on the thiophene sulfides, is simple in preparation method, low in cost and mild in condition, can be repeatedly used for multiple times, and has good application prospects in the field of deep desulfurization of fuel oil.

Description

technical field [0001] The invention belongs to the technical field of fuel oil processing, and in particular relates to a preparation method and application of a dopamine / silicon dioxide composite airgel. Background technique [0002] With the rapid development of the economy and the rapid growth of the automobile industry, the consumption of fuel oil is also increasing sharply. However, the combustion of sulfide contained in fuel oil will produce a large amount of sulfur oxides, which will not only cause environmental problems such as acid rain and smog, but also pose a serious threat to human health. For this reason, countries around the world have successively enacted strict environmental regulations to limit the sulfur content in fuel oil. How to reduce the sulfur content in fuel oil has also become the focus of researchers' research. [0003] At present, the desulfurization process widely used in industry is hydrodesulfurization, which is relatively mature and can ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J20/28B01J20/22B01J20/30C10G25/00
CPCB01J13/0091B01J20/103B01J20/22B01J20/28047C10G25/00C10G2300/202
Inventor 高建广张波殷路霞宫婉慧
Owner ZHEJIANG UNIV OF TECH
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