(314c) A pH-Responsive TFC NF Membrane with Rechargeable Anti-Bacterial Property and High Efficient Dye/Monovalent Salt Separation Via Catechol/Boronate Complexation

Membrane decorated with biocides was an effective way to surpass biofilm growth. However, their immediate biocidal effect usually suffered from significant decline due to the irreversible consumption of the biocides. Here we reported an innovative loose nanofiltration membrane with rechargeable antibacterial capability that fabricated by performing a simple interfacial polymerization via 3-aminophenylboronic acid (3-APBA) and trimesoyl chloride (TMC) on a polysulfone substrate. A natural biocadal – tannic acid (TA) – can be grafted onto the membrane surface under natural/alkaline condition and then released from the surface under acidic environment, due to the pH-responsive property of catechol/boronate complexation. The resultant membrane exhibited integrated properties of fast bacterial inactivating efficiency against Staphylococcus aureus, rechargeable antibacterial capability and significantly expanded duration. In addition, the achieved membrane showed remarkable separation efficiency to dye/monovalent salt system. The successful synthesis of this novel NF membrane with rechargeable anti-bacterial property could provide new insights into the development of pH-responsive and sustainable antibacterial membranes.