High-Performance PBA12F@CS/PVA@ZIF-8 composite membranes for dye wastewater treatment

Abstract

The effective filtration and treatment of dye wastewater through membrane technology can reduce environmental pollution and contribute to the realization of sustainability. In this study, a composite membrane for dye separation with antimicrobial properties is proposed which combines a support layer of PBA12F manufactured through electrospinning and a functional layer of CS/PVA@X-ZIF-8, resulting in the fabrication of PBA12F@CS/PVA@X-ZIF-8 nanofiber composite membrane. Compared to homogeneous PBA12F membranes, PBA12F@CS/PVA@X-ZIF-8 nanofiber composite membrane exhibits higher flux. As for the composite membrane with a ZIF-8 content of 0.1 wt%, the pure water flux reaches 65.04 L/m²·h, and a 50 % increase over the homogeneous membrane. Furthermore, an increase in ZIF-8 content leads to enhanced dye rejection and antimicrobial properties of the composite membrane, with inhibition rates exceeding 70 % for Escherichia coli and Staphylococcus aureus. The retention rates for pollutants BSA and HA exceed 90 %. These findings demonstrate the potential of PBA12F@CS/PVA@ZIF-8 composite membranes in pollution treatment.