Abstract
A water-insoluble β-cyclodextrin (β-CD) polymer was synthesized by reacting β-CD with hexamethyl- ene diisocyanate, and its adsorption kinetics and thermodynamics for phenol from aqueous solution was investi- gated. The kinetics of adsorption followed the pseudo-second-order model and the adsorption isotherms could be well fitted by the Freundlich adsorption equation. The values of thermodynamic parameters demonstrated that the adsorption was a physisorption in a spontaneous and exothermic process.
Highlights
Cyclodextrins (CDs) are torus-shaped cyclic oligosaccharides containing six to twelve glucose units
The equilibrium time of different initial phenol concentrations was conducted and the results showed that the initial phenol concentrations had little effect on the adsorption equilibrium time
Water-insoluble β-CD polymer was synthesized by reacting β-CD with hexamethylene diisocyanate, and its adsorption kinetics and thermodynamics for phenol from aqueous solution was investigated with variations in phenol concentration and contact time at the temperature range of 15 to 60 oC
Summary
Cyclodextrins (CDs) are torus-shaped cyclic oligosaccharides containing six to twelve glucose units. The individual glucose units are held in a C-1 chair conformation and they are connected by α-1,4-glycosidic linkages to form a cyclic structure.[1] The interior cavity of CDs is relatively hydrophobic and the most characteristic feature of CDs is the ability to form inclusion complexes through host-guest interactions in aqueous solution.[2] No covalent bonds are broken or formed during the formation of the inclusion complex, the main driving force is the release of enthalpy-rich water from the cavity of CDs, and other forces including van der Waals interactions, hydrogen bonding, hydrophobic interactions, etc. The practically important, industrially produced CDs are composed of six, seven or eight (α, β, and γ, respectively) D-glucopyranosyl units. β-cyclodextrin (β-CD) is the most largely produced cyclodextrin and has been widely used as “molecular cages” in the pharmaceutical, agrochemical, food and cosmetical industries.[4]
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