Abstract
The research included studying the photocatalytic efficiency of zinc oxide onto photo reaction of Alizarin yellow (A.Y) in the presence of ultraviolet radiation. Several parameters affect the photolysis rate of dye were studied such as: effect of acidic function, different oxidants and supporting of zinc oxide surface. The solution of dye was irradiated using medium pressure mercury lamp 400 W. The results showed that the maximum percentage of dye photolysis was at a natural acidic function using hydrogen peroxide as oxidant and activated charcoal as support. The kinetics of reaction were also studied and the results proved that the reaction from pseudo first order.
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