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Studies on the Preparation and Application of Chitosan Supported β-cyclodextrin

Author: LiShaoGuang
Tutor: Fei
School: Northwest Normal University
Course: Score of Chemistry and Physics
Keywords: Immobilized β- cyclodextrin chitosan microspheres Cyclodextrin immobilized chitosan film Hydroquinone Adsorption Thermodynamics Dynamics
CLC: O636.12
Type: Master's thesis
Year: 2008
Downloads: 38
Quote: 1
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Abstract


Summary of thesis immobilized chitosan and cyclodextrin modified on the basis of research , mainly made ??the following tasks: 1. Chitosan and glutaraldehyde as raw materials , the use of O / W emulsion prepared by inverting chitosan microspheres , then using a 6 - methylene diisocyanate as crosslinking agent , the functional groups immobilized β- cyclodextrin chitosan microspheres , to give a novel by Chitosan β- cyclodextrin microspheres . Phenol - sulfuric acid method to determine the apparent β- cyclodextrin immobilized amount of 4.3%. FT-IR, TG-DTA and XRD showed that immobilized β- cyclodextrin chitosan microspheres , thermal stability , crystallinity, and other properties changed greatly . 2 Application prepared immobilized β- cyclodextrin chitosan microspheres as adsorbent to study the adsorption behavior of hydroquinone . At pH = 7.0, operating temperature 303K, the oscillation time 10h conditions, immobilized β- cyclodextrin chitosan microspheres hydroquinone theoretical maximum adsorption capacity of up 23.31mg / g. The adsorbent adsorption hydroquinone Langmuir and Freundlich equation can be used to describe the thermodynamic analysis showed that the adsorption is a spontaneous exothermic process . 3 with β- cyclodextrin as a raw material , its use epichlorohydrin crosslinked polymer , prepared by the water-soluble cyclodextrin polymer , and having a γ- bifunctional glycidyl ether -3 - methoxy silane, by solution evaporation method to achieve crosslinking of chitosan and cyclodextrin polymers immobilized prepared chitosan immobilized cyclodextrin polymer film . Using FT-IR, XRD, TG and SEM product structure and properties were characterized . In the feed ratio ( γ- glycidyl ether in -3 - methoxy group and an epoxy silane molar ratio of amino groups of chitosan ) and evaporating to 1:1,303 K 6h, the obtained solid chitosan the porous β- cyclodextrin containing microporous membrane rules distribution (1-3μm), a saturated water absorption of 120.52%, β- cyclodextrin apparent volume of immobilized 78mg / g. 4 Using the resulting chitosan immobilized β- cyclodextrin as adsorbent porous membrane was studied in water adsorption behavior of hydroquinone , solution concentration and adsorption capacity with the increase of pH , adsorption at 2h within reach equilibrium ; kinetics study shows that cyclodextrin immobilized chitosan porous membrane adsorption of hydroquinone prevail two processes to chemical adsorption is the rate controlling step , the apparent activation energy of adsorption 70.0kJ/mol .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Natural polymers ( polymer ) > Polymer polysaccharides > Starch, dextrin,glycogen, inulin
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