ZnO, AgCl and AgCl/ZnO nanocomposites incorporated chitosan in the form of hydrogel beads for photocatalytic degradation of MB, E. coli and S. aureus

Significant improvement of effective and low-cost decolorization and disinfecting technologies is required toaddress the problems created by dyes and dangerous microorganisms from water and wastewaters. This article expresses the degradation of methylene blue (MB), Escherichia coil (E. coli) and Staphylococcus aureus (S. aureus) as gram negative and positive bacteria via a chitosan/AgCl/ZnO (CS/AgCl/ZnO) nanocomposite hydrogel beads system as a photocatalyst under visible light irradiation. The techniques such as FT-IR, SEM, EDAX, TGA, and XRD were applied to recognize the synthesized beads. Decolorization and disinfection experimental results revealed that the hydrogel beads system effectively degrade MB and bacteria. Also, the effects of the initial amount of catalysts, pH, coions and initial concentration of dye on the photocatalytic decolorization were investigated. Moreover, kinetics analysis indicates that the photocatalytic degradation rate of MB and bacteria can be described by Langmuir-Hinshelwood (L-H) and Weibull inactivation models, respectively. We provide a reusable and recoverable effective organic/inorganic photocatalyst in the form of beads that could solve the disadvantages of powder photocatalytic, without reducing the efficiency. (C) 2019 Elsevier B.V. All rights reserved.