Bisphenol A Adsorption on Silica Particles Modified with Beta-Cyclodextrins

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Bisphenol A (BPA) is a widespread environmental pollutant with potential health risks.
• Effective methods for BPA removal from wastewater are crucial for environmental protection.
• Beta-cyclodextrin (BCD) possesses properties suitable for adsorbing organic pollutants.

Purpose of the Study:

• To synthesize novel silica particles functionalized with two distinct beta-cyclodextrin derivatives (BCD-OH and BCD-NH2).
• To investigate the adsorption performance of these BCD-modified silica materials for BPA removal from aqueous solutions.
• To elucidate the formation mechanism and adsorption characteristics of the synthesized materials.

Main Methods:

• Synthesis of beta-cyclodextrin (BCD) modified silica particles.
• Characterization using FT-IR, TGA, contact angle measurements, BET analysis, and SEM.
• Adsorption experiments to determine BPA removal efficiency, kinetics, and isotherm models.

Main Results:

• Successful synthesis of BCD-modified silica particles confirmed by spectroscopic and thermal analysis.
• High BPA adsorption capacities achieved: 107 mg/g for SiO-BCD-OH and 112 mg/g for SiO-BCD-NH2.
• Adsorption equilibrium reached within 180 minutes, following pseudo-second-order kinetics and fitting the Freundlich isotherm model.

Conclusions:

• The synthesized BCD-modified silica particles are effective adsorbents for BPA removal from wastewater.
• The BCD moieties on the silica surface significantly enhance adsorption properties.
• The materials show potential for application in water treatment technologies for BPA remediation.