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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 AY23 solution in EC/UV/ZnO process were [ZnO]0 = 650 mg·dm, [NaCl] = 800 mg·dm, light intensity = 31/2 W·m, current density = 120 A·m, electrodes distance = 15 mm, pH = 6.29, stirring rate = 900 rpm and electrodes of steel 304/Al, which yielded 99.70% colour removal in 5 min of treatment time.

Decolourization of tartrazine from aqueous solutions by coupling electrocoagulation with ZnOphotocatalyst