Fabrication of porous beta-cyclodextrin functionalized PVDF/Fe-MOF mixed matrix membrane for enhanced ciprofloxacin removal

초록

Herein, we demonstrate the synthesis of beta-cyclodextrin (beta-CD) functionalized polyvinylidene fluoride (PVDF) and iron-based metal-organic framework (Fe-MOF) mixed matrix membrane (MMM) for the enhanced removal of ciprofloxacin (CIP) from water. The membranes were prepared using the phase inversion technique with PVDF as the polymer matrix, Fe-MOF as the filler, and polyvinylpyrrolidone (PVP) as the porogen. The optimized MMM with 7% wt. Fe-MOF exhibited excellent performance with 87.6% removal efficiency. Moreover, the maximum adsorption capacity was 6.43 mg g-1. The beta-CD functionalization improved the MMM hydrophilicity exhibited by the water contact angle (WCA) analysis (WCA = 55 degrees). Furthermore, excellent adsorption performance can be attributed to the large Fe-MOF specific surface area (682.5 m2 g-1), the high porosity (77%), and the average pore diameter (395 nm) of the membrane. The inclusion of PVP (1% wt.) enhanced the porous nature of the MMM and, consequently, the adsorption performance for CIP. Notably, the hydrophilic and macroporous membrane showed good reusability with over 70% removal efficiency after five sequential adsorption-desorption cycles. The insights from this study suggest that the PMC-7 membrane can be an excellent candidate for the remediation of organic contaminants from aquatic environments.

키워드