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Functionalized silicon dioxide modified defluorination material as well as preparation and application thereof

A technology of silica and mesoporous silica, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as easy leakage, achieve good permeability and easy recycling Use, the effect of low relative density

Active Publication Date: 2021-05-11
JIANGSU HELPER FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exchange resin loaded with high-valent metal ions can selectively remove a small or trace amount of high-concentration anions, but the high-valent metal ions loaded on the exchange resin are easy to leak

Method used

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  • Functionalized silicon dioxide modified defluorination material as well as preparation and application thereof
  • Functionalized silicon dioxide modified defluorination material as well as preparation and application thereof
  • Functionalized silicon dioxide modified defluorination material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Add 2g SiO 2 The (65 mesh) mesoporous nanomaterial was soaked in 50ml of 2% acetic acid for 6 hours, and acidified and hydrolyzed.

[0037] 2. Dissolve 3 g of chitosan oligosaccharide (COS) in 100 ml of 2.5% acetic acid, and stir for 5 hours under magnetic stirring to obtain chitosan oligosaccharide solution.

[0038] 3. The acidified SiO obtained in step 1 2 Add it into the above oligochitosaccharide solution, stir at room temperature for 4 hours, and remove excess chitooligosaccharide solution by suction filtration to obtain oligochitosaccharide functionalized mesoporous silica nanoparticles.

[0039] 4. Add 2 g of malonic acid into the above-mentioned chitosan-functionalized mesoporous silica nanoparticles, and stir at room temperature for 2 hours.

[0040] 5. Add 2g of metal oxide La 2 o 3 Dissolve in 1M 100ml hydrochloric acid solution, and stir at room temperature for 2 hours to obtain an acidic solution of metal oxide.

[0041] 6. Add the above metal oxid...

Embodiment 2

[0043] 1. Add 4g SiO 2 (100 mesh) mesoporous nanomaterials were soaked in 50ml of 4% acetic acid for 5 hours, and acidified and hydrolyzed.

[0044] 2. Dissolve 5 g of chitosan oligosaccharide (COS) in 150 ml of deionized water, and stir for 6 hours under magnetic stirring to obtain chitosan oligosaccharide solution.

[0045] 3. The acidified SiO obtained in step 1 2 Add it into the above-mentioned oligochitosaccharide solution, stir at room temperature for 8 hours, remove excess chitooligosaccharide solution by suction filtration, and obtain functionalized mesoporous silica nanoparticles of oligochitosaccharide.

[0046] 4. Add 3 g of malonic acid into the above-mentioned chitosan-functionalized mesoporous silica nanoparticles, and stir at room temperature for 4 hours.

[0047] 5. Add 3g of metal salt Ce(NO 3 ) 2 Dissolve in 1.5M 80ml sulfuric acid and stir at room temperature for 2 hours to obtain an acidic solution of metal hydrochloride.

[0048] 6. Add the above-mentio...

Embodiment 3

[0050] 1. Add 8g SiO 2 (80 mesh) mesoporous nanomaterials were soaked in 100ml 2% oxalic acid for 5 hours, and acidified and hydrolyzed.

[0051] 2. 10 g of chitosan oligosaccharide (COS) was dissolved in 200 ml of 3% oxalic acid aqueous solution, and stirred for 5 hours under magnetic stirring to obtain chitosan oligosaccharide solution.

[0052] 3. The acidified SiO obtained in step 1 2 Add it into the above-mentioned oligochitosaccharide solution, stir at room temperature for 8 hours, remove excess chitooligosaccharide solution by suction filtration, and obtain functionalized mesoporous silica nanoparticles of oligochitosaccharide.

[0053] 4. Add 4 g of malonic acid into the above-mentioned chitooligosaccharide functionalized mesoporous silica nanoparticles, and stir at room temperature for 3 hours.

[0054] 5. Mix 6g of metal oxide Y 2 o 3 Dissolve in 2M 100ml hydrochloric acid solution, and stir at room temperature for 2 hours to obtain an acidic solution of the meta...

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Abstract

The invention relates to a functionalized silicon dioxide modified defluorination material and preparation and an application thereof, and a preparation method of the functionalized silicon dioxide modified defluorination material comprises the following steps: reacting acidified mesoporous silicon dioxide nanoparticles with chitosan oligosaccharide in an acidic aqueous solution, and after the reaction is completed, obtaining chitosan oligosaccharide modified mesoporous silica nanoparticles; reacting chitosan oligosaccharide modified mesoporous silica nanoparticles with dicarboxylic acid in an acidic aqueous solution, then reacting with a metal compound, and treating in an alkaline solution after the reaction is completed so that metal hydroxides are generated on the surfaces of the mesoporous silica nanoparticles, and obtaining the functionalized silica modified defluorination material. According to the functionalized silicon dioxide modified fluorine removal material, dicarboxylic acid connected with chitosan oligosaccharide is used for chelating metal ions, the bonding stability of the metal ions is improved, and the modified material can remove fluorine ions through the dual effects of ion exchange and electrostatic adsorption.

Description

technical field [0001] The invention relates to the technical field of fluorine removal, in particular to a functionalized silicon dioxide modified fluorine removal material and its preparation and application. Background technique [0002] To minimize the risks of fluoride to human health, the World Health Organization (WHO) recommends a maximum level of 1.5 mg / L of fluoride in drinking water. In order to meet such environmental standards, various technologies for defluoridation of water bodies have been developed, such as precipitation, ion exchange, membrane separation and adsorption technologies, among which are the effective use of fly ash, chitosan beads, laterite, waste pulverized coal Ash, granular red mud, hydrated cement, attapulgite, geotechnical materials and acid-treated fuller's earth are used for defluoridation, some of which have been commercialized. [0003] At present, the widely used defluoridation technology is to use lime precipitation to produce insolu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/42C02F1/48C02F101/14
CPCC02F1/28C02F1/288C02F1/281C02F1/286C02F1/42C02F1/48C02F2101/14Y02W10/37
Inventor 蔡建国石洪雁刘锐
Owner JIANGSU HELPER FUNCTIONAL MATERIALS
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