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Efficient magnetic sorbent for extracting bisphenol A from aqueous samples.

Abdullah Alhendal1, Jessy Shiju1, Zahoor Ahmad1

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Bisphenol A (BPA) is an endocrine-disrupting chemical found in aqueous solutions, necessitating efficient detection and removal methods.
  • Magnetic solid-phase extraction (MSPE) offers a promising technique for isolating and concentrating analytes from complex matrices.
  • Developing novel magnetic sorbents with enhanced adsorption capabilities is crucial for improving BPA extraction efficiency.

Purpose of the Study:

  • To synthesize and characterize novel magnetic polymer sorbents for Bisphenol A (BPA) extraction.
  • To evaluate the performance of these sorbents using magnetic solid-phase extraction (MSPE) coupled with HPLC-UV.
  • To optimize extraction conditions and assess the method's analytical performance for BPA determination.

Main Methods:

  • Two magnetic polymer sorbents, MPCNT and MPTCl, were synthesized by modifying polydimethylsiloxane (PDMS) with 3-aminopropyltriethoxysilane (APTS) and incorporating carboxyl-functionalized multi-walled carbon nanotubes (MWCNT-COOH) in MPCNT.
  • Extensive characterization of the MPCNT sorbent was performed using techniques including XPS, zeta potential, FT-IR, TGA, SEM, AFM, and TEM.
  • Optimization of MSPE parameters such as polymer content, pH, sample volume, and salting-out effect was conducted to maximize BPA extraction.

Main Results:

  • The MPCNT sorbent, containing MWCNT-COOH, exhibited significantly enhanced BPA adsorption due to improved π-π interactions, hydrogen bonding, and hydrophobic domains.
  • The optimized MSPE method using MPCNT demonstrated good reproducibility with a relative standard deviation (RSD) of 7.85%.
  • The method achieved excellent linearity (r² = 0.9992) with a limit of detection (LOD) of 15.15 µg L⁻¹ and a limit of quantification (LOQ) of 50.00 µg L⁻¹.

Conclusions:

  • The developed magnetic polymer sorbent (MPCNT) is highly effective for the extraction of Bisphenol A (BPA) from aqueous solutions.
  • The MSPE method coupled with HPLC-UV provides a sensitive, reproducible, and efficient analytical tool for BPA determination.
  • This approach holds potential for environmental monitoring and the assessment of BPA contamination in water samples.