Photo Catalytic Inactivation of Escherichia coli Using Titanium(IV) Oxide-Tungsten (VI) Oxide Nanoparticies Composite. International Journal of Photocatalysis. P
Wandiga, Shem O
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Abstract This work focused on synthesis of Titanium (IV) Oxide and Tungsten (VI) Oxide compos'ite and testing the composite as a photocatalyst in deactivation of Escherichi coli in water. Modified wet chemistry method was used and the synthesized nanoparticles calcined at 5750 C, taken through XRay Fluorescence and X-Ray Diffraction. The result showed a particle size diameter of 18.99nm. The nanoparticles photocatalytic inactivation efficacyof Escherichia coli in water was tested. 3M Petrifilms from 3M Microbiology Products, U.S.A., was used for Escherichia coli colony forming units' counts. ATUV 8W G8 T5 lamp from PHILIPS emitting between 350-600nm was used as energy source. The catalyst reduced Escherichia coli count by log 3.415 at an optimum catalyst amount of 0.75 q/L at pH 7.3 using the Chick-Watson model for disinfection kinetics. This work proved that photocatalysis is a promising technology in water purification with possible and practical opportunities existing especially for small-scale point-of-use water purification units where potable water could be treated for disinfection of pathogens or trace priority pollutants remaining in water distribution network after conventional treatment methods. This work proved that nano particles can provide solutions in treatment of drinking water especially for poor communities living in the tropics.