Cyclodextrin-clay composite and preparation method thereof

A composite material and cyclodextrin technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problem of no chemical bonding and achieve high-efficiency adsorption

Inactive Publication Date: 2013-04-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In their research, the cyclodextrin was directly inserted between the layers of montmorillonite for compounding, and there was no chemical bond between montmorillonite and cyclodextrin.

Method used

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  • Cyclodextrin-clay composite and preparation method thereof
  • Cyclodextrin-clay composite and preparation method thereof
  • Cyclodextrin-clay composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 278g of α-cyclodextrin (α-CD), 466g of sodium chloroacetate and 192g of sodium hydroxide in a 25L reactor, measure 2L of deionized water, react at 80°C for 3h, then cool with an ice bath, and wait for After the temperature of the solution drops to room temperature, add 3 mol / l hydrochloric acid dropwise to adjust the pH value to 6, precipitate with a large amount of methanol and dissolve the precipitate several times to wash away unreacted raw materials and by-product sodium chloride. Finally, the product is exchanged with ion exchange resin (Z001×4) to convert sodium ions into hydrogen ions. After the column is finished, the product is placed in a freeze dryer to dry for a week, and finally carboxymethylated cyclodextrin (α- CMCD).

Embodiment 2

[0033] Put 324g of β-cyclodextrin (β-CD), 466g of sodium chloroacetate and 192g of sodium hydroxide in a 25L reactor, measure 2L of deionized water, react at 80°C for 3h, then cool with an ice bath, and wait for After the temperature of the solution drops to room temperature, add 3 mol / l hydrochloric acid dropwise to adjust the pH value to 6, precipitate with a large amount of methanol and dissolve the precipitate several times to wash away unreacted raw materials and by-product sodium chloride. Finally, the product is exchanged with an ion exchange resin (Z001×4) to convert sodium ions into hydrogen ions. After passing through the column, the product is placed in a freeze dryer to dry for a week, and finally carboxymethylated cyclodextrin (β- CMCD).

Embodiment 3

[0035] Put 370g of γ-cyclodextrin (γ-CD), 466g of sodium chloroacetate and 192g of sodium hydroxide in a 25L reactor, measure 2L of deionized water, react at 80°C for 3h, then cool with an ice bath, and wait for After the temperature of the solution drops to room temperature, add 3 mol / l hydrochloric acid dropwise to adjust the pH value to 6, precipitate with a large amount of methanol and dissolve the precipitate several times to wash away unreacted raw materials and by-product sodium chloride. Finally, the product is exchanged with ion exchange resin (Z001×4) to convert sodium ions into hydrogen ions. After the column is finished, the product is placed in a freeze dryer to dry for one week, and finally carboxymethylated cyclodextrin (γ- CMCD).

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PUM

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Abstract

The invention relates to a cyclodextrin-clay composite and a preparation method thereof, belonging to the technical field of composite preparation. The cyclodextrin-clay composite is prepared by reacting montmorillonite and hectorite as basic materials with carboxymethylation cyclodextrin, wherein the mass fraction of cyclodextrin in the composite can be controlled by changing the function base number and chain length of the silane coupling agent. The method has the advantages of being easily available in raw materials, low in cost and simple. The cyclodextrin-clay composite can achieve the purpose of simultaneously removing metal ions and organic aromatic compounds by exchange adsorbility of clay to metal ions and clathration of cyclodextrin to organic matters (especially aromatic organic matters).

Description

technical field [0001] The invention relates to a cyclodextrin-clay mineral composite material and a preparation method thereof, belonging to the technical field of composite material preparation. Background technique [0002] Cyclodextrin (CD) is the product of cyclodextrin glycosyltransferase acting on starch. It is a cyclic oligosaccharide composed of multiple glucose molecules linked by 1,4-glycosidic bonds. It has a slightly conical hollow cylindrical three-dimensional ring structure. In its hollow structure, the outer upper end (larger opening end) is formed by C 2 and C 3 The secondary hydroxyl group is formed, and the lower end (smaller open end) is composed of C 6 It is composed of primary hydroxyl groups and has hydrophilicity; while the hydrophobic region is formed in the cavity due to the shielding effect of the C-H bond, and its hydrophobic cavity can combine with more organic guest molecules of matching size to form host-guest inclusion complexes. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28B01D15/00
Inventor 陈明清梅涛锋何冰晓施冬健段芳李巧萍
Owner JIANGNAN UNIV
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