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CA/CS/TiO 2  composite membranes were formed by cellulose acetate (CA) electrospun fibers which were used as the basal layer, and chitosan (CS)/sol-gel titanium dioxide (TiO 2 ) which was coated as a surface layer on one side. The composite membrane exhibited a smooth and flat surface when the CS:TiO 2  ratio was 10:1 (mass ratio) and the CA:CS ratio was 12:10 (volume ratio). This layered structure of the membrane exhibited a water flux of 119 L/(m 2 ·h). Adsorption testing of this composite membrane for dyes showed that the adsorption capacities of methylene blue and rhodamine were 42 and 51 mg/g, respectively. The composite membrane showed better adsorption performance for rhodamine mainly because of the bonding between the hydroxyl groups of CS and TiO 2  and the carboxyl groups of the rhodamine dye. The adsorption processes of the two dyes were in accord with a second-order kinetic equation.

journal of macromolecular science, part b

Preparation and Adsorption Performance of Cellulose Acetate Fiber-Chitosan/Titanium Dioxide Surface Layers Composite Membranes Prepared Based on a Sol-Gel Method