Biopolymers-based nanocomposites: Membranes from propionated lignin and cellulose for water purification

► Biofilms made of esterified lignin and acetylated cellulose render high stabilized composites. ► Propionation allowed incorporating lignin nanoparticles to cellulose triacetate polymer matrix. ► All nanocomposites were electrically charged, but the one made of pure cellulose triacetate. ► Nanofiltration or RO processes were attained with composites, for ground water purification.