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Sodium alginate-MOF (metal organic framework) composite spherule as well as preparation method and application thereof

A metal-organic framework and sodium alginate technology, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of poor acid resistance, difficult separation and recovery, etc., to improve stability, Large specific surface area, effect of preventing dissolution

Inactive Publication Date: 2016-04-20
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of poor acid resistance and difficult separation and recovery of existing MOFs in application, the present invention provides a sodium alginate-metal organic framework composite pellet and its preparation method and application. Add sodium alginate-metal organic framework mixture dropwise into the precipitant solution of , water and ethanol to obtain uncrosslinked composite beads, and then add glutaraldehyde solution to crosslink the sodium alginate framework to obtain sodium alginate-metal organic framework Composite pellets with a particle size of about 1 mm have the advantages of strong acid resistance, large adsorption capacity, and easy separation from water.

Method used

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  • Sodium alginate-MOF (metal organic framework) composite spherule as well as preparation method and application thereof
  • Sodium alginate-MOF (metal organic framework) composite spherule as well as preparation method and application thereof
  • Sodium alginate-MOF (metal organic framework) composite spherule as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Chromium nitrate nonahydrate, terephthalic acid (the mass ratio of chromium nitrate nonahydrate and terephthalic acid is 2.41:1) is added in the hydrofluoric acid solution with a mass fraction of 0.3% (the mass ratio of solid to solvent is 0.08: 1), after stirring evenly, add it to the autoclave, heat the reactor to 220°C, react for 8 hours to obtain the crude product, after cooling, dissolve the obtained crude product in 200mL of absolute ethanol, Stir for 1.5 hours, and then centrifuge at 10,000 rpm for 5 minutes. After the obtained solid is repeatedly washed with ethanol, a refined metal-organic framework material MIL-101(Cr) is obtained.

[0048] Add the MIL-101 (Cr) and sodium alginate (viscosity-average molecular weight of 100,000) obtained in the previous step into water (wherein the mass ratio of sodium alginate, metal organic framework compound, and water is 1:1:50), fully Stir until the mixture is uniform, and then ultrasonically shake to remove air bubbles to...

Embodiment 2

[0054] Chromium nitrate nonahydrate, trimesic acid (the mass ratio of chromium nitrate nonahydrate and trimesic acid is 0.35:1) is added in the hydrofluoric acid solution with a mass fraction of 4% (the mass ratio of solid to solvent is 0.04: 1), after stirring evenly, add it to the autoclave, heat the reactor to 220°C, react for 96 hours to obtain the crude product, after cooling, dissolve the obtained crude product in 300mL of absolute ethanol, Stir for 1.0 hour, and then centrifuge at 10,000 rpm for 5 minutes. After repeated washing of the obtained solid with ethanol, a refined metal-organic framework material MIL-100(Cr) is obtained.

[0055] The MIL-100 (Cr) obtained in the previous step and sodium alginate (viscosity average molecular weight is 5,000) are added into water (wherein, the mass ratio of sodium alginate, metal organic framework compound, water is 1:0.5:50), fully Stir until the mixture is uniform, and then ultrasonically shake to remove air bubbles to obtain ...

Embodiment 3

[0061] Add aluminum nitrate nonahydrate and trimesic acid (the mass ratio of aluminum nitrate nonahydrate to trimesic acid is 2.21:1) into a nitric acid solution with a mass fraction of 20% (the mass ratio of solid to solvent is 0.10:1) , after stirring evenly, add it to the autoclave, heat the reactor to 210°C, and react for 3 hours to obtain the crude product. After cooling, dissolve the obtained crude product in 100mL of absolute ethanol, and stir at 80°C for 2.0 hours, and then centrifuged at 10,000 rpm for 5 min, and the obtained solid was repeatedly washed with ethanol to obtain a refined metal-organic framework material MIL-100(Al).

[0062] Add the MIL-100 (Al) and sodium alginate (viscosity average molecular weight is 200,000) obtained in the previous step into water (wherein the mass ratio of sodium alginate, metal organic framework compound, and water is 1:0.25:50), fully Stir until the mixture is uniform, and then ultrasonically shake to remove air bubbles to obtai...

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Abstract

The invention discloses a sodium alginate-MOF (metal organic framework) composite spherule as well as a preparation method and an application thereof, belongs to the field of material synthesis and overcomes the defect that a conventional MOF material has small grain size and poor acid resistance and is difficult to be separated from water. The co-precipitation technology is adopted, a sodium alginate-MOF mixed liquid is dropwise added to a precipitant solution containing calcium chloride, water and ethyl alcohol, a non-crosslinked composite spherule is obtained, then the composite spherule is added to a glutaraldehyde solution for cross-linking of a sodium alginate framework, the sodium alginate-MOF composite spherule is obtained, the grain size of the spherule is about 1 mm, and the composite spherule has the characteristics of high acid resistance, high separability from water, high water pollutant adsorption capacity, high mechanical strength, long service life, environment-friendliness and the like.

Description

technical field [0001] The invention belongs to the field of material synthesis, and more specifically relates to an acid-resistant sodium alginate-metal organic framework composite bead adsorbent and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs) adsorbents are a class of inorganic-organic hybrid materials constructed from inorganic metal units and organic ligands. The topological structure and physical and chemical properties of this kind of material are changeable, and the application fields are wide. Due to the advantages of porosity, multiple active sites, and large specific surface area, MOFs have high application value in the fields of adsorption, purification, enrichment and recovery of water pollutants. For example, the Chinese patent application number is 201210428982.5, and the patent application document published on March 13, 2013 discloses a metal-organic framework material and a preparation method for met...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01J20/28C02F1/28
CPCB01J20/22B01J20/226C02F1/285C02F1/288B01J20/28019B01J2220/4812B01J2220/44B01J2220/4806
Inventor 杨维本杨朕兰亚乾卓宁沈佳淳张讯通
Owner NANJING NORMAL UNIVERSITY
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