Efficient adsorption of bisphenol A using magnetically recyclable nanocomposites with Box Behnken optimization

Area of Science:

• Environmental Chemistry
• Materials Science
• Adsorption Science

Background:

• Bisphenol A (BPA) is a prevalent environmental contaminant.
• Effective removal of BPA from aqueous environments is crucial.
• Fe3O4/ZIF-8 (MFZ) nanocomposite shows promise as an adsorbent.

Purpose of the Study:

• To evaluate the adsorption potential of Fe3O4/ZIF-8 (MFZ) for BPA removal.
• To optimize BPA adsorption using Response Surface Methodology (RSM).
• To characterize the MFZ adsorbent and assess its performance.

Main Methods:

• Adsorbent characterization using SEM, VSM, TGA, BET, XPS, FT-IR, and XRD.
• Optimization of adsorption parameters (pH, dose, time, temperature) via Box-Behnken Design (BBD).
• Experimental validation of optimized conditions and assessment of regeneration and interference effects.

Main Results:

• A quadratic model (R²=0.995) effectively described the adsorption process.
• Optimal conditions (pH 6.2, 0.75 g/L dose, 72 min, 315 K) predicted 99.1% BPA removal.
• Experimental validation confirmed high removal efficiency (98.9%) with minimal deviation.
• Inorganic salts showed varying degrees of inhibition on BPA adsorption.
• MFZ maintained significant BPA removal efficiency over five regeneration cycles.

Conclusions:

• Fe3O4/ZIF-8 (MFZ) is a highly effective adsorbent for Bisphenol A removal.
• RSM-optimized conditions ensure efficient and predictable BPA removal.
• MFZ demonstrates good stability and reusability for environmental remediation applications.