Construction of solvent resistance O-PASS@UiO-66-NH2/O-PASS composite membrane for methylene blue removal

The purification of dye wastewater plays a critical role in water pollution treatment. Adsorption is a cheap and effective separation technology but is limited by the reuse of adsorption materials. Ultrafiltration membranes have a relatively high flux but their pores are too large to reject small dye molecules. In this study, negatively charged oxidized poly (arylene sulfide sulfone) (O-PASS) membrane, NMP pretreatment oxidized O-PASS (N-O-PASS) membrane, and O-PASS@UiO-66-NH 2 /O-PASS composite membranes were fabricated to retain cationic methylene blue (MB) from wastewater by combining ultrafiltration and adsorption techniques. The increased porosity of the N-O-PASS membrane provides more available adsorption sites for an equilibrium MB adsorption amount of 22.5 (mg g −1 ) and 100% rejection in the first 10 min during ultrafiltration with a pure water flux of 162.32 (L m −2 h −1 bar −1 ). Due to the enhanced hydrophilicity and separating property by deposited UiO-66-NH 2 particles and PASS resin, O-PASS@UiO-66-NH 2 /O-PASS composite membrane shows a flux of 170.32 (L m −2 h −1 bar −1 ) and a 100% MB rejection in 60 min with great reusability. The O-PASS@UiO-66-NH 2 /O-PASS composite membrane is a new promising membrane for the removal of dyes from wastewater. Meanwhile, the superior solvent resistance endows it great adaptability in wide applications, especially in harsh conditions.