Techno Press

Advances in Environmental Research   Volume 4, Number 1, March 2015, pages 25-38
Photocatalytic degradation of textile dye CI Basic Yellow 28 wastewater by Degussa P25 based TiO2
Gülhan Köneçoğlu, Şafak Toygun, Yasemen Kalpaklı and Mesut Akgün

Abstract     [Full Text]
    Wastewaters of textile industry cause high volume colour and harmful substance pollutions. Photocatalytic degradation is a method which gives opportunity of reduction of organic pollutants such as dye containing wastewaters. In this study, photocatalytic degradation of C.I. Basic Yellow 28 (BY28) as a model dye contaminant was carried out using Degussa P25 in a photocatalytic reactor. The experiments were followed out at three different azo dye concentrations in a reactor equipped UV-A lamp (365 nm) as a light source. Azo dye removal efficiencies were examined with total organic carbon and UV-vis measurements. As a result of experiments, maximum degradation efficiency was obtained as 100% at BY28 concentration of 50 mgL-1 for the reaction time of 2.5 h. The photodegradation of BY28 was described by a pseudo-first-order kinetic model modified with the langmuir-Hinshelwood mechanism. The adsorption equilibrium constant and the rate constant of the surface reaction were calculated as Kdye = 6.689ù10-2 L mg-1 and kc = 0.599 mg L-1min-1, respectively.
Key Words
    photocatalytic degradation; Degussa P25; textile dye wastewaters; Basic Yellow 28; Langmuir-Hinshelwood mechanism
Yildiz Technical University, Chemical Engineering Department, Davutpasa Campus, No: 127, 34210 Esenler, Istanbul, Turkey.

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