preparation and characterization of zno & tio2 nanocatalysts for photo degradation of bentazon existing in polluted water

Abstract One of the most important scientific research activities in both of energy and environmental sectors is synthesizing of composites such as nanocatalyst powders of zinc oxide and titanium oxide. The reason why is the best to use this combination of composites, as they are available in the market, with low cost, they have powerful optical,electric properties, high stability, and nontoxicity,these composites are classified as one of the best promising photocatalysts. They show high level of light absorption range and wide range of charge transfer from ZnO to TiO2 their composite has a superior photocatalytic activity. The goal of this investigation is to prove the applicability of ZnO–TiO2 composite as a photocatalyst for degradation of Bentazon in polluted water. Many various parameters will be studied, to see their effects on the process of the degradation of the Bentazon, examples of that are the initial catalyst dosage, pH level, initial Bentazon concentration, purging of oxygen gas, adding of hydrogen peroxide of a multiple concentration and total organic compounds on the removal efficiency of Bentazon.The best guaranteed removal of Bentazon is at neutral pH,and the reason for that could be due to the photo-corrosion of ZnO composite for both acidic and basic conditions. While it is noticeable that degradation of the Bentazon decreased in the presence of organic compounds. Removing the Bentazon by UV/ZnO/TiO2 process shows greater Efficiency than that by UV/TiO2 process, UV/ZnO, and UV alone.