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Preparation method of SiO2 aerogel/activated carbon composite material adsorbent

A composite material and composite adsorption material technology, which is applied in the field of preparation of SiO2 aerogel/activated carbon composite material adsorbent, can solve the problems of complex oil phase composition, cumbersome preparation, and few other problems, so as to improve the adsorption effect and avoid by-products. Effect

Pending Publication Date: 2020-07-24
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, on SiO 2 Although the research on airgel / activated carbon composite has been reported, there are still not many
In addition, the previous preparation methods still have some shortcomings, such as high cost, complex oil phase components and cumbersome preparation

Method used

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  • Preparation method of SiO2 aerogel/activated carbon composite material adsorbent
  • Preparation method of SiO2 aerogel/activated carbon composite material adsorbent
  • Preparation method of SiO2 aerogel/activated carbon composite material adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Under normal pressure, take 55ml of ammonia water in a 500ml volumetric flask, set the volume to the mark, and prepare a 2.5% ammonia solution; take 50ml of hydrochloric acid in 150ml of water, and configure 3mol / L hydrochloric acid; water glass: deionized water =1:4 ratio Take 30ml of water glass into a beaker, add 120ml of deionized water, and stir with the glass. Take a certain amount of 3mol / L hydrochloric acid, add the prepared water glass, and let it stand for 24 hours to fully hydrolyze the silicon source under acidic conditions. Add 2.5% ammonia water, put in 5g activated carbon powder, and gel after a period of time. Wash and filter the airgel / activated carbon composite material prepared above with ethanol for 2-3 times. The airgel / activated carbon composite was aged with n-hexane for 24 h. The aged airgel / activated carbon composite was dried at 40°C under normal pressure for 24 hours to prepare a black airgel / activated carbon composite.

Embodiment 2

[0027] Under normal pressure, take 55ml of ammonia water in a 500ml volumetric flask, set the volume to the mark, and prepare a 2.5% ammonia solution; take 50ml of hydrochloric acid in 150ml of water, and configure 3mol / L hydrochloric acid; water glass: deionized water =1:3 ratio Take 30ml of water glass and put it in a beaker, add 90ml of deionized water, and stir with the glass. Take a certain amount of 3mol / L hydrochloric acid, add the prepared water glass, and let it stand for 24 hours to fully hydrolyze the silicon source under acidic conditions. Add 2.5% ammonia water, put in 5g activated carbon powder, and gel after a period of time. Wash and filter the airgel / activated carbon composite material prepared above with ethanol for 2-3 times. The airgel / activated carbon composite was aged with n-hexane for 24 h. The aged airgel / activated carbon composite was dried at 40°C under normal pressure for 24 hours to prepare a black airgel / activated carbon composite.

Embodiment 3

[0029] Under normal pressure, take 55ml of ammonia water in a 500ml volumetric flask, set the volume to the mark, and prepare a 2.5% ammonia solution; take 50ml of hydrochloric acid in 150ml of water, and configure 3mol / L hydrochloric acid; water glass: deionized water =1:2 ratio Take 30ml of water glass into a beaker, add 60ml of deionized water, and stir with the glass. Take a certain amount of 3mol / L hydrochloric acid, add the prepared water glass, and let it stand for 24 hours to fully hydrolyze the silicon source under acidic conditions. Add 2.5% ammonia water, put in 5g activated carbon powder, and gel after a period of time. Wash and filter the airgel / activated carbon composite material prepared above with ethanol for 2-3 times. The airgel / activated carbon composite was aged with n-hexane for 24 h. The aged airgel / activated carbon composite was dried at 40°C under normal pressure for 24 hours to prepare a black airgel / activated carbon composite.

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Abstract

The invention relates to a preparation method of a SiO2 aerogel / activated carbon composite material adsorbent, and belongs to the technical field of adsorption materials. The preparation method is characterized in that a sol-gel process is adopted; the SiO2 aerogel / activated carbon composite material is prepared by taking sodium silicate as a silicon source and deionized water as a solvent, respectively preparing HCl and ammonia water with certain concentrations as catalysts, adding different amounts of activated carbon and adopting a normal-pressure drying process, the preparation process issimple, the raw materials are cheap and easy to obtain, the preparation period is short, and the prepared material is stable in chemical property. The composite adsorbing material prepared by the invention has a relatively large specific surface area, can effectively adsorb chromium ions in wastewater, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, in particular to a SiO 2 Preparation and application of airgel / activated carbon composite adsorbent. Background technique [0002] Heavy metals have many different definitions. Can be divided into three categories: toxic metals (Hg, Cr, Pb, Zn, Cu, Ni, Cd, As, Co, Sn, etc.), radioactive metals (U, Th, Ra, Am, etc.) and precious metals (Pd, Pt, Ag, Au, Ru, etc.), according to the survey, millions of tons of heavy metals are discharged into the environment every year. [0003] A large amount of untreated urban domestic garbage, industrial and domestic sewage, and atmospheric sediments are continuously discharged into water bodies. These pollution sources contain a large amount of heavy metals, which are the main causes of heavy metal pollution in my country's waters. According to the 2012 Bulletin on the State of the Environment in China, the main pollution indicators in the sedimen...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/103B01J20/28047C02F1/283C02F2101/20
Inventor 李贞玉李红双闫钰陈妍苏佳航袁雨菲
Owner CHANGCHUN UNIV OF TECH
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