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Decolourization of tartrazine from aqueous solutions by coupling electrocoagulation with ZnO photocatalyst

Modirshahla N., Abdoli M., Behnajady M. A., Vahid B.

Environment Protection Engineering

2013

Vol. 39, nr 1

59--73

Decolourization of tartrazine (C.I. Acid Yellow 23, AY23) in aqueous solutions has been investigated by coupling electrocoagulation and ZnO photocatalyst methods and also by a comparison between ZnO, UV, EC, UV/ZnO, UV/EC, and EC/UV/ZnO systems in the removal of AY23 as a model contaminant. Results indicated that the decolourization efficiency was in order of EC/UV/ZnO > UV/EC > EC > UV/ZnO > ZnO > UV. Combining EC with UV/ZnO can trigger the Fenton or Fenton-like reaction, which accelerates the rate of decolourization. Desired operating conditions for decolourization of 40 mg·dm-3 AY23 solution in EC/UV/ZnO process were [ZnO] 0=650 mg·dm-3, [NaCl] = 800 mg·dm-3, light intensity = 31/2 W·m-2, current density = 120 A·m-2, electrodes distance = 15 mm, pH = 6.29, stirring rate = 900 rpm and electrodes of steel 304/A1, which yielded 99.70% colour removal in 5 min of treatment time.

PH effect on decolorization of raw textile wastewater polluted with reactive dyes by advanced oxidation with U/VH2O2

Racyte J., Rimeika M., Bruning H.

Environment Protection Engineering

2009

Vol. 35, nr 3

167-178

The effectiveness of the advanced oxidation process (UV/H2O2) in decolorizing real textile wastewater polluted with commercial reactive dyes - Reactive Yellow 84 and Reactive Red 141 - was investigated. All the experiments were performed in a lab-scale reactor with the original high pH of the wastewater. The dyeing wastewater was decolorized in 5 hours. After its acidification to pH 3 the decolorization process was more efficient. Full decolorization was then achieved in 2 hours and the decrease in COD exceeded 70%. The reaction rate constants obtained were as follows: at pH 11.4, 0.0065 min(-1); at pH 7, 0.0044 min(-1), and at pH 3, 0.019 min(-1), which testified to pH importance for UV/H2O2 oxidation process.