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Advances in Environmental Research
  Volume 4, Number 1, March 2015, pages 25-38
open access

Photocatalytic degradation of textile dye CI Basic Yellow 28 wastewater by Degussa P25 based TiO2
Gülhan Köneçoğlu, Şafak Toygun, Yasemen Kalpaklı and Mesut Akgün

    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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