Tailoring the Adsorption and Antibacterial Bifunctions of Newly Constructed Porous Alginate-Chitosan-Graphene Oxide Nanosheets Gel Beads

Organic dye molecules and pathogenic microorganisms exist widely in printing and dyeing wastewater, causing persisting concerns about water environment safety. Herein, newly developed alginate-chitosan-graphene oxide nanosheets gel beads with both exceptional adsorption and antibacterial functions are reported. NaHCO3 is selected as porogen and Ag+ is used as antibacterial enhancer. The adsorption properties of the beads fit well with the Langmuir isotherm and pseudo-second-order model, suggesting a monolayer behavior of the adsorption and their reaction rate is controlled by chemisorption. The theoretical liminal value of the adsorption of methylene blue by the beads reaches 847.46 mg g(-1). After five adsorption-desorption cycles, the beads retain almost intact adsorption activity, and the sterilization rates of Escherichia coli and Staphylococcus aureus remain at 99.99%. The results give insight into developing new processing routes for constructing gel beads for versatile applications.