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

Abstract

CA/CS/TiO₂ composite membranes were formed by cellulose acetate (CA) electrospun fibers which were used as the basal layer, and chitosan (CS)/sol-gel titanium dioxide (TiO₂) which was coated as a surface layer on one side. The composite membrane exhibited a smooth and flat surface when the CS:TiO₂ 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/(m²·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 TiO₂ and the carboxyl groups of the rhodamine dye. The adsorption processes of the two dyes were in accord with a second-order kinetic equation.

Keywords:

• Coating
• composite membrane
• dye adsorption
• electrospinning
• filtration

Additional information

Funding

This work was funded by the Innovation Program for College Graduates of Jiangsu (SJCX22_1334, KYCX22_3091), Opening Project of the State Key Laboratory of Materials-Oriented Chemical Engineering (KL21-06), the Jiangsu Province Key Laboratory of Fine Petrochemical Engineering (KF2202) and the Major Projects of Basic Science Research in Colleges and Universities of Jiangsu (22KJA530002).