Photocatalytic degradation of pathogenic bacteria using functionalized different sized ZnOnano filmswith 1-[(E)- 1,3-benzothiazol-2-yldiazenyl]naphthalen-2-ol

Author(s): H.R.Ravi, P.N.Prashanth kumar, H.R.Sreepad

This paper presents the high bacterial interaction strategy to improve the antimicrobial activity of visible-light-activatedZnOfilms. Themanufacturing nanostructured semiconductor layers on the glass substrates prepared fromthe surfactant-assisted complex sol–gel method obtained different grain sized ZincOxide (ZnO) nanoparticles using zinc nitrate and citric acid as starting material. The effect of the citric acid concentration, varying the pH of the sol solution and PEG 2000 surfactant which affects the grain size of the ZnO nanoparticles. It was investigated usingX-ray diffraction andUV-Visible absorbance spectroscopy. In this study, we demonstrated that functionalizedZinc oxide substrates having superior visible-light-induced bactericidal activity against Escherichia coli compared to pure Zinc oxide films. Particularly at pH=1 ZnO nano films surface complexed by benzothiophine dyes shifts the photocatawavelength towards higher region then the other pH values (3,5,7) which is mainly due to the smaller the grain size and rich in surface active sities which affects the adsorption of dyes. For obtaining the high photocatalytic performance is attributed to an effect of following factors: rich in active surface area of the ZnOfilms, an increase in absorption and shifting the wavelength towards visible region of the functionalized semiconducting films, From these findings suggest that ZnO functionalized films has potential applications in the development of alternative disinfections for environmental usages.

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