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A kind of lanthanum-modified mesoporous silica airgel and its preparation method and application

A technology of mesoporous silica and aerogel, which is applied in the fields of chemical instruments and methods, alkali metal oxides/hydroxides, silicon compounds, etc., and can solve the problems of unsuitable large-scale industrial production, harsh conditions, high toxicity, etc. problems, to achieve the effect of fast material transmission, simple operation and large processing capacity

Active Publication Date: 2022-05-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supercritical drying method has harsh conditions and cannot meet large-scale industrial production; the normal pressure drying method requires long-term solvent replacement and is highly toxic

Method used

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  • A kind of lanthanum-modified mesoporous silica airgel and its preparation method and application
  • A kind of lanthanum-modified mesoporous silica airgel and its preparation method and application
  • A kind of lanthanum-modified mesoporous silica airgel and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Take 20g of commercially available cotton and place it in 300mL of sulfuric acid solution with a mass fraction of 40%, then stir and react at 45oC for 2h, then transfer it to a beaker, dilute to 2000mL with distilled water, then let it stand overnight and pour it out For the supernatant, the suspension was centrifuged, washed three times with distilled water to remove the amorphous substance, and the suspension was transferred to a dialysis membrane for dialysis for 2 to 4 days until the pH was about 2.4, then ultrasonicated for 10 minutes, and diluted to obtain nanocellulose crystals ( CNC) for use;

[0042] (2) Pipette 10 mL of the CNC obtained in step (1), sonicate for 30 minutes until it is transparent, place it in a glass vial, add 500 μL of tetramethoxysilane (TMOS), and then add 0.02 g of ammonium persulfate (APS) , stirred and reacted at 25°C for 2 hours, poured into a mold and freeze-dried at -90°C for 2 to 3 days;

[0043](3) Put the composite airgel synt...

Embodiment 2

[0058] (1) Take 20g of commercially available cotton and place it in 300mL of sulfuric acid solution with a mass fraction of 50%, then stir and react at 45oC for 3h, then transfer it to a beaker, dilute to 2000mL with distilled water, then let it stand overnight and pour it out Supernatant, centrifuge the suspension, wash with distilled water three times to remove the amorphous, transfer the suspension to a dialysis membrane for dialysis for 2 to 4 days, until the pH is about 2.4, then sonicate for 10 minutes, dilute to obtain cellulose nanometer (CNC )stand-by;

[0059] (2) Pipette 10 mL of the CNC obtained in step (1), sonicate for 30 min until it is transparent, place it in a round bottom flask, add 600 μL of tetramethoxysilane (TMOS), and then add 0.03 g of ammonium persulfate (APS ), stirred and reacted at 25°C for 2 hours, poured into a mold and freeze-dried at -90°C for 2 to 3 days;

[0060] (3) Put the composite airgel synthesized in step (2) in a crucible, and calcin...

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Abstract

The invention belongs to the technical field of material preparation and separation, and discloses a lanthanum-modified mesoporous silica airgel, a preparation method and application thereof, which have high selectivity and high adsorption capacity for phosphate. The steps include: using biomass cellulose nanocrystals (CNCs) as a guide template, using tetramethoxysilane (TMOS) as a mesoporous template, ammonium persulfate (APS) as a crosslinking agent, adding lanthanum nitrate hexahydrate, and freeze-drying Airgel materials were synthesized and used for selective adsorption of phosphate in solution. The airgel material obtained in the invention greatly improves the adsorption performance of the adsorbent, and at the same time, the freeze-drying method has simple operation, short cycle and low toxicity.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and relates to a lanthanum-modified mesoporous silica airgel and its preparation method and application. The lanthanum-modified mesoporous silica airgel has high adsorption to phosphorus quantity and high selectivity. Background technique [0002] Nowadays, waste water contains a relatively high concentration of phosphate radicals. Discharging into coastal waters or lakes can easily cause water eutrophication, resulting in excessive reproduction of algae and microorganisms, a sharp decrease in dissolved oxygen, affecting the growth of aquatic animals and plants, and threatening human health. At the same time, phosphate containing phosphate is necessary for the phosphorus industry (including agricultural fertilizers, animal feed, chemical preparation, etc.). Therefore, it is particularly important to adopt appropriate technical methods to recover phosphate radicals in ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/103B01J20/0207B01J20/28047C02F1/281C02F2101/105Y02W10/37
Inventor 杨心砚汪云云景旋蒋银花闫永胜
Owner JIANGSU UNIV