Polyelectrolyte fabricated nanofiltration membrane with heterogeneously charged channels for high efficient cephalexin wastewater treatment.

Nanofiltration (NF) for treatments of pharmaceutical wastewater is a promising direction for water protection and resources recovery. Herein, a novel membrane with heterogeneously charged channels was constructed by modified layer-by-layer assembly methods. Within the well-designed pores, the polyanion structure excludes the cephalexin and the cationic structure slows down its diffusion, thereby rejections for cephalexin are improved.