Preparation and characterization of cellulose acetate/carboxymethyl cellulose acetate blend ultrafiltration membranes

► CMCA was first synthesized from CMC-Na by acidifying and esterifying. ► CA/CMCA blend UF membranes were prepared via phase inversion process. ► PEG 600 was used as additive in the cast film promoting the formation of pore. ► The permeation flux was increased by addition of CMCA in casting solution. ► The modified membranes showed better antifouling property than CA membranes.