الفهرس 
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Abstract
This study discusses the photocatalytic oxidation and degradation of phenol using ZnO particles / 254 nm UV system in a slurry type reactor sparged by air. Also , The effect of various process parameters such as initial concentration of Phenol, ZnO loading, initial solution pH, and air superficial velocity on the photo-degradation reaction were investigated to achieve maximum degradation efficiency. The degradation process was tracked by measuring the solution COD at many time intervals during the experiment period .The results showed that the percentage of COD reduction increases with increasing the air superficial velocity while decrease with increasing the PH or the initial concentration of Phenol. Also ,the percentage of COD reduction increases with increasing ZnO loading up to 1.5 g/l then decrease with further increasing in the amount of ZnO. The maximum percentage of COD reduction was 78.2 % at 25 ppm, pH 2, catalyst loading 1.5 g/l and air superficial velocity of 2.51cm/s. The order of the reaction was determined using Lagergren’s rate equation and linear pseudo second order equation and was found to be pseudo second order reaction.. A correlation between Sherwood, Schmidt and Reynolds dimensionless numbers was developed to describe the solid liquid mass transfer.