β-Cyclodextrin functionalized polystyrene porous monoliths for separating phenol from wastewater.

Area of Science:

• Materials Science
• Environmental Chemistry
• Polymer Chemistry

Background:

• Cyclodextrin-based materials are promising for pollutant adsorption.
• Developing efficient and recyclable adsorbents is crucial for environmental remediation.

Purpose of the Study:

• To synthesize a beta-cyclodextrin (β-CD) functionalized polystyrene porous monolith.
• To evaluate its adsorption capacity and recyclability for phenol removal.

Main Methods:

• Preparation of allyl-β-cyclodextrin (allyl-β-CD) and its use in creating a concentrated emulsion with styrene and divinyl benzene.
• Copolymerization to form the porous monolith, followed by water phase removal.
• Characterization using X-ray photoelectron spectroscopy (XPS) and phenol adsorption/desorption experiments.

Main Results:

• The porous monolith exhibited internal surfaces enriched with β-CD due to the amphiphilic nature of allyl-β-CD.
• High β-CD content and specific surface area led to a high phenol adsorption capacity (5.74 mg/g).
• The monolith was easily regenerated with ethanol and maintained stable adsorption properties for at least five cycles.

Conclusions:

• The β-CD functionalized polystyrene porous monolith is an effective adsorbent for phenol.
• Its recyclability and stable performance make it a viable option for water treatment applications.
• This material offers a promising approach for removing phenolic pollutants from wastewater.