Porous biomass gel beads SA/CS/GO construction and bifunction tuning on adsorption and antibacterial properties

Abstract

Abstract The organic dye molecules and pathogenic microorganisms exist widely in printing and dyeing wastewater which will bring severe harm to human beings and the water environment if they are not properly treated. A novel SA/CS/GO gel beads with both adsorption and antibacterial functions are synthesized in the special ways. NaHCO3 is selected as porogen to control the density of gel beads formed by the cross-linking of Ca2+. Ag+ is fixed on outside the beads to optimize the inactivation rate of typical strains. The morphology and composite of the beads are characterized through SEM and FT-IR spectrometer. The adsorption properties of the beads accord with the Langmuir isotherm and quasi-secondary model, that means, the adsorption is monolayer behavior and the reaction rate is controlled through the chemical reaction process. The theoretical adsorption liminal value of MB on the beads can reach 847.46 mg/g. In the range of pH value at 3–11, it also has good adsorption ability. After five rounds of adsorption-desorption experiments, the gel beads still remain favorable performance. At the same time, the sterilization rate of the beads is almost 100% for the selected typical strains, even after several adsorption-desorption cycles, it still has a good bactericidal function. So, this kind of new gel beads is easy to recycle, reusable, and has broad application foreground in the field of water purification, sterilization, and adsorption.