Abstract
This study investigated the effect of UV/nano-TiO2 on photocatalytic destruction of aqueous methylene blue dyes. Also, the effect of different parameters such as temperature, pH and irradiation time studied. The results showed that the UV/nano-TiO2 system is able to remove a significant amount of blue methylene dye from aqueous solution in an hour. It was also found that midium acidity can affect on the dye removal in which the neutral and alkaline pH are more effective than acidic conditions in removing dyes. Finally, the study of temperature changes approved that it has no significant effects on the efficiency of destruction process. The size of photocatalyst nano particles was evaluated using XRD in a range of 0.458 and 0.576 nm before and after treatment, respectively. Results showed that by the use of the synthesized TiO2 / zeolite about 90 % of methylene blue was removed under UV irradiation. Structure and morphology were studied by, SEM, XRD.
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