Preparation and sorption studies of polyester microsphere copolymers containing β-cyclodextrin

Area of Science:

• Materials Science
• Polymer Chemistry
• Environmental Science

Background:

• Developing efficient sorbent materials is crucial for environmental remediation.
• Polyester copolymers incorporating cyclodextrins offer potential for pollutant removal.

Purpose of the Study:

• To synthesize and characterize polyester copolymers with beta-cyclodextrin (β-CD).
• To evaluate the sorption properties of these copolymers for p-nitrophenol (PNP) from aqueous solutions.

Main Methods:

• Water-in-oil (w/o) micro-emulsion preparation of β-CD polyester copolymers.
• Characterization using TGA, nitrogen adsorption, NMR/IR spectroscopy.
• Sorption studies using UV-Vis spectrophotometry at controlled pH and temperature.

Main Results:

• Sorption capacity varied from 0.221 to 0.352 mmol/g, influenced by cross linker type (sebacoyl chloride vs. terephthaloyl chloride) and mole ratio.
• Sorbents exhibited dual sorption sites: β-CD inclusion sites and interstitial linker domains.
• Sorption capacity correlated with swelling properties and hydrated surface area.

Conclusions:

• The synthesized β-CD polyester copolymers are effective sorbents for PNP.
• The cross linker type significantly impacts sorption capacity, with sebacoyl chloride-based materials showing superior performance.
• Understanding dual sorption mechanisms is key to designing advanced sorbent materials.