International Journal on Advanced Science, Engineering and Information Technology, Vol. 8 (2018) No. 6, DOI:10.18517/ijaseit.8.6.3884

Antibacterial Inactivation of Escherichia coli after TiO2-Fe3O4-Bentonite Photocatalytic Treatment

Restu Kartiko Widi, Emma Savitri, Olivia Angelina, Sherlly Caroline O. J, Arief Budhyantoro

Abstract

TiO2-Fe3O4–Bentonite photocatalytic material has been developed to inactivate of Escherichia coli. The photocatalytic inactivation of Escherichia coli was conducted in a reactor under ultraviolet (325 nm) exposing. The photocatalytic degradation  were observed for 5 hours to determine the optimum initial bacteria concentration, intensity of UV light and also photocatalyst concentration. The inactivation kinetic was approached by Chick-Watson and Hom kinetic models. The colonies calculations were conducted by Total Plate Count. The  optimum condition was achieved for 300 minutes process to reach 7 bacterial log reduction units for an average bacterial inoculum size of 3.8 × 104 CFU/ml. The inactivation kinetic of Escherichia coli using TiO2-Fe3O4-Bentonitephotocatalytic material system satisfactorily obeyed the Hom kinetic model. 

Keywords:

TiO2, photocatalytic, disinfection, inactivation kinetics, E.coli

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