Photocatalytic Performance of CdS/(Pt-TiO2)-Pumice for E. Coli Disinfection in Drinking Water

Abstract

Photocatalytic removal of E. coli pathogen bacteria existing in drinking water was studied in this paper. CdS/(Pt-TiO2) nanocomposite was produced by depositing Pt/CdS on TiO2 nanoparticles with chemical reduction and hydrothermal method. On the other hand, CdS/(Pt-TiO2)-Pumice was fabricated by immobilizing of titania composite onto pumice with dip coating method to become photocatalysis without causing problem in the separation titania from solution. The Field Emission Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) were utilized to characterize the photocatalyst samples. Based on the morphology characterization, it was observed that successful deposition of Pt and CdS on TiO2 occurred. Furthermore, decorating Pt/CdS on TiO2 can reduce bandgap energy compare to the bare TiO2 according to the UV-Vis DRS analysis. The treatment of E. coli inactivation with CdS/(Pt-TiO2), CdS/(Pt-TiO2)-pumice and without photocatalyst had performed in the photoreactor that irradiated with mostly visible light in 90 min. The amount of photocatalyst and the contact mechanism between the photocatalyst and bacteria in the water would effects the perf