الفهرس 
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Abstract
In this current study, a high efficient photocatalytic nanosystem of chitosan (CS) and polyvinylidene chloride (PVDC) based on different morphologies of TiO2 and Au nanocomposites was prepared, namely as CS/PVDC/TiO2&Au nanocomposites. Firstly, the titanium dioxide nanowires TiO2–NWs, gold nanoparticles (Au–NPs) and TiO2–NWs decorated with Au–NPs (TiO2/Au) were successfully fabricated and wellevaluated using X–ray diffractometer (XRD) and transmission electron microscope (TEM). Furthermore, chitosan was prepared from shrimps shell wastes and blended with (PVDC) then different loadings of TiO2/Au nanocomposites were incorporated onto biopolymer as well as thin films. The prepared CS/PVDC/TiO2/Au NPs nanocomposites thin films were characterized using UV–Visible spectra, Fourier-transform infrared (FT-IR), X–ray diffraction (XRD) and transmission electron microscopy (TEM). Moreover, the CS/PVDC/TiO2&Au nanocomposites were used for photodecomposition of ethidium bromide (EtBr), under artificial light 50 W/m2 and sunlight irradiation from ~ 400 – 600 W/m2 with and without aeration. In addition the integrity of the EtBr, after decomposition was assessed by horizontal gel electrophoresis. The results indicated that, the CS/PVDC/TiO2/Au nanocomposites were sufficient to remove ~ 50–95٪ of the EtBr, during irradiation time course, ~ 75٪ mineralization by HPLC, ~ 60٪ of the EtBr, was degraded, ~65٪ of total organic carbon conversion is achieved in the first one hour.