Photocatalytic degradation of textile dye CI Basic Yellow 28 wastewater by Degussa P25 based TiO2

Konecoglu G., Toygun S., KALPAKLI Y. , AKGÜN M.

ADVANCES IN ENVIRONMENTAL RESEARCH-AN INTERNATIONAL JOURNAL, vol.4, no.1, pp.25-38, 2015 (Journal Indexed in ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 1
  • Publication Date: 2015
  • Doi Number: 10.12989/aer.2015.4.1.025
  • Page Numbers: pp.25-38
  • Keywords: photocatalytic degradation, Degussa P25, textile dye wastewaters, Basic Yellow 28, Langmuir-Hinshelwood mechanism


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 mg L-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 K-dye = 6.689. 10(-2) L mg(-1) and k(c) = 0.599 mg L-1 min(-1), respectively.