الفهرس 
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Abstract
The present work had two main purposes: 1. To study the effect of different parameters on the degradation of methylene blue from a solution through photocatalysis. 2. To examine the effectiveness of using fluorinated ethylene propylene tubing (FEP) as a transmitter for UV radiation, and compare it to earlier researches that used quartz glass. The photocatalytic reactor used Titanium dioxide (TiO2) as a catalyst and FEP as a transmitter for UV radiation (wave length: 254 nm). It was developed and used to degrade methylene blue (MB) in water solution through an advanced oxidation process (AOP). The mode of operation was UV radiation transmitted through FEP, along with TiO2 (Nano particle, Anatase) as a catalyst mixed with the flowing solution. The reactor was used mainly to try a modern technique of photocatalysis, in which the solution flowed inside narrow tubes exposed continuously to UV radiation. Through the experimentation process, the effect of the flow rate (12.5, 50, 87.5, 125 ml/min), initial concentration of the solution (5, 10, 15, 20 ppm), pH value (3, 7, 9, 11), TiO2 dose (0.5, 1 1.5, 2 g/l), the effect of UV radiation without using a catalyst and the performance of the TiO2 in the removal of the dye without using UV radiation, were all studied.The following results were obtained: - As flow rate increases, the performance of the reactor improves significantly - Acidic solutions (3 pH) appeared much better in terms of improving % removal - 10 ppm can be considered the optimum initial concentration of the MB, comparing it to 5,15 and 20 ppm, as increasing the initial concentration caused a decrease in the rate of removal - Increasing the dose of TiO2 didn’t cause a huge improvement in the rate of removal. Therefore, it had a minute effect on the overall performance of the process - The reaction was found to depend completely on the UV radiation availability, and to be affected to a great extent by the usage of catalyst (TiO2) - The reaction can be considered to be fitting pseudo first order mode