ADSORPTION AND PHOTODEGRADATION OF PROCION YELLOW H-EXL DYES IN TEXTILE WASTEWATER OVER TiO2 SUSPENSION
نویسنده
چکیده
Removal of a commercial dye (Procion yellow H-EXL) in both synthetic and real wastewater from textile industry over TiO2 suspension has been investigated. The study included both adsorption process (over TiO2) and photocatalytic degradation process in the presence of UV illumination (UV/TiO2). The processes were carried out in aqueous solutions containing the dyes in the presence of titanium dioxide, TiO2, (Degussa P-25) upon UV irradiation of 100 Watt. The photocatalytic process used the photogenerated holes (at the surface of TiO2) and hydroxyl radicals (at the solution bulk) as oxidizing species for the dyes. Different parameters affecting the adsorption and photocatalytic degradation processes such as solution pH, initial dyes concentration, and TiO2 dosages were investigated, Results obtained revealed that various dyes concentration loads were removed at optimum solution pH = 5 with TiO2 dosage of 1 g/L. The dyes removal % is inversely proportional to its concentration, the lower the dyes concentration, the higher the efficiency of dyes removal. The efficiency values of both adsorption and photocatalytic degradation processes reached maximum values of 46.4 and 100 %, respectively, with dyes concentration of 10 mg/L. The photocatalytic degradation of the investigated dyes exhibited pseudo first-order kinetics according to the Langmuir-Hinshelwood's heterogeneous catalytic model.
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