Adsorption and extraction performance for phenolic compounds with magnetic-thermal dual-responsive composite material

Area of Science:

• Polymer Chemistry
• Environmental Science
• Analytical Chemistry

Background:

• Bisphenol A (BPA) and bisphenol B (BPB) are environmental contaminants.
• Developing efficient adsorbents and extraction methods is crucial for water purification and monitoring.

Purpose of the Study:

• To synthesize poly(N-isopropylacrylamide) (PNIPAM) composite materials.
• To investigate their adsorption performance for BPA and BPB.
• To establish a magnetic solid-phase extraction (MSPE) method for phenolic compounds in water.

Main Methods:

• Free radical polymerization to prepare PNIPAM composite materials.
• Thermosensitive adsorption/desorption studies.
• Kinetic and isotherm modeling (pseudo-second-order and Freundlich).
• Magnetic solid-phase extraction method development and validation.

Main Results:

• PNIPAM composites showed excellent adsorption for BPA and BPB via hydrophobic interactions and hydrogen bonds.
• Adsorption followed pseudo-second-order kinetics and Freundlich isotherm models.
• Maximum adsorption capacities reached 187.13 mg·g⁻¹ for BPA and 271.45 mg·g⁻¹ for BPB.
• MSPE method achieved low detection limits (0.0005 - 0.02 mg·L⁻¹) and high recovery rates (75.81 - 97.54 %).

Conclusions:

• The synthesized PNIPAM composite exhibits high adsorption capacity for BPA and BPB.
• The magnetic and thermal dual-responsive properties enable efficient separation and recovery.
• The developed MSPE method is effective for analyzing phenolic compounds in water samples.