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3D chitosan/silicon dioxide composite material and preparation method and application thereof in rhenium adsorption and separation

A technology of silica and composite materials, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of poor stability of adsorbents, few active sites, and poor adsorption selectivity, etc., to achieve The hydrolysis speed is slow, the preparation process is simple, and the effect of high-efficiency adsorption and separation

Inactive Publication Date: 2021-11-30
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a preparation method of 3D chitosan / silica composite material, the method of the present invention solves the problem of poor stability of traditional adsorbents, high cost, long synthesis time, active site It can achieve high-efficiency adsorption and separation of Re(VII) and has high practical value.

Method used

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  • 3D chitosan/silicon dioxide composite material and preparation method and application thereof in rhenium adsorption and separation
  • 3D chitosan/silicon dioxide composite material and preparation method and application thereof in rhenium adsorption and separation
  • 3D chitosan/silicon dioxide composite material and preparation method and application thereof in rhenium adsorption and separation

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Embodiment 13

[0044] Embodiment 1 3D chitosan / silica composite material

[0045] (1) 3D chitosan / silica composites prepared under different chitosan additions

[0046] 1. 3D chitosan / silica composite material SS-KIT-6-M4-15-CS3

[0047] 1) Dissolve 4.0g of P123 in 120g of deionized water and 20mL of concentrated HCl. After completely dissolving, add 4.0g of n-butanol dropwise to the solution. After mixing and stirring at 308K for 1 hour, slowly drop in 23.46g of 50% aqueous solution of sodium silicate (SS) was stirred for 1.5 hours to obtain a mixed solution.

[0048] 2) mix the mixed solution with chitosan acetic acid solution (3.0g chitosan CS is dissolved in 50mL, in 2% acetic acid) mix, after stirring evenly, add 15mL mass percent concentration and be 25% glutaraldehyde solution (GA ), continue mixing and stirring at 308K for 6h to obtain a mixed system.

[0049] 3) Transfer the mixed system to a microwave reaction tank, and react for 4 hours under the conditions of 400W and 368K usi...

Embodiment 2

[0071] Example 2 Application of 3D Chitosan / Silica Composite Material in Adsorption and Separation of Re(VII) (1) Test of Adsorption Performance of Re(VII) under Different Acidity Conditions

[0072] The method is as follows: Accurately weigh 10 mg of the 3D chitosan / silicon dioxide composite material SS-KIT-6-M4-Y-CSX prepared in Example 1, place them in shaking bottles respectively, add 10 mL of 20 mg·L -1Shake the rhenium solution evenly, put the shaking bottle in a constant temperature shaking box at a speed of 180 rpm, shake at 30°C for 24 hours, filter, and measure the concentration of rhenium ions in the solution before and after adsorption by ultraviolet spectrophotometry. The result is as Figure 5a with Figure 5b shown.

[0073] Depend on Figure 5a It can be seen that as the pH of the solution increases from 1 to 4, the adsorption amount of rhenium by the composite material increases gradually, and then stabilizes above 90% until pH=7. When the addition of chit...

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Abstract

The invention relates to a 3D chitosan / silicon dioxide composite material and a preparation method and application thereof in rhenium adsorption and separation. A one-step rapid microwave-assisted synthesis method is adopted, P123 is used as a template, sodium silicate is used as a silicon source, chitosan is added in the hydrolytic condensation process of the sodium silicate, Si-OH is combined with -OH and -NH2 on the chitosan under the action of a covalent bond and a hydrogen bond, then glutaraldehyde is added as a cross-linking agent, the chitosan and mesoporous silica are compounded, and the 3D chitosan / silicon dioxide composite material is obtained. The preparation raw materials are biomass materials which are low in price and easy to obtain, the preparation process is simple, the synthesis speed is high, the time is short, the Re(VII) adsorption rate in high-concentration Cu(II) simulated feed liquid is high, the rhenium adsorption rate can reach 96.67% when the pH value is 4, the maximum saturation adsorption capacity is 261.81 mg*g<-1>, and effective separation of the rare and scattered metal element Re (VII) can be achieved.

Description

technical field [0001] The invention belongs to the technical field of effective adsorption and separation of rhenium and the preparation of mesoporous silica adsorption materials, and specifically relates to the preparation of a 3D chitosan / silicon dioxide composite material and its application in efficient adsorption and separation of Re(VII). Background technique [0002] Rhenium is one of the rare metals with high utilization value, and it is silvery white. Due to its high melting point, boiling point and high density, rhenium is a good refractory metal with the characteristics of high hardness, strong corrosion resistance and high friction resistance. In addition, rhenium also has good mechanical stability and high catalytic activity. Therefore, the wide application of rhenium and its alloys in the fields of petrochemical, metallurgy, national defense and aerospace has made it an extremely important strategic metal material. However, the abundance (7-10%) of rhenium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28B01J20/30C02F101/20
CPCB01J20/24B01J20/103C02F1/286C02F1/281C02F2101/20
Inventor 熊英杜欣伟张泽涛娄振宁单炜军于海彪王月娇冯小庚崔俊硕
Owner LIAONING UNIVERSITY
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