Superior effect of TEMPO-oxidized cellulose nanoflbrils (TOCNs) on the performance of cellulose triacetate (CTA) ultrafiltration membrane

摘要

Cellulose triacetate (CTA) ultrafiltration membranes were prepared via phase inversion technique using hydro-philic TEMPO-oxidized cellulose nanoflbrils (TOCNs) as modifying agents. The permeation performance of the prepared membranes was evaluated in terms of pure water flux (Ji), protein rejection (Rm) and flux recovery ratio (FRR). Membrane surface morphology and cross-sectional structures were characterized by atomic-force microscopy (AFM) and scanning electron microscopy (SEM), respectively. XRD was performed in order to investigate the interactions between membrane components. Meanwhile, the effects of TOCN concentration on hydro-philicity of the membrane surface and mechanical properties were also examined. The experimental results indicated that CTA/TOCN composite membranes exhibit significant differences in surface properties and intrinsic properties due to the addition of TOCNs.