Abstract: Ti/SnO₂-Sb₂O₅-CuO electrode was prepared by thermal decomposition and was characterized through scanning electron microscopy(SEM), linear sweep voltammetry and strengthening life test. It was indicated that Ti/SnO₂-Sb₂O₅-CuO electrode had more compact microstructure, higher oxygen evolution potential, lower chlorine evolution potential, and longer strengthening life than Ti/SnO₂-Sb₂O₅ electrode. Ti/SnO₂-Sb₂O₅-CuO electrode for electro-oxidation degradation of ammonium in simulated high concentration salt dyeing wastewater was systematically investigated. The results showed that the efficiency of NH₃-N removal rose with increasing Cl- concentration, when Cl- concentration was less than 10 g/L. When Clconcentration is higher than 10 g/L, there was no significant change in the efficiency of NH₃-N removal.

The efficiency of NH₃-N removal had not changed obviously. In experimental conditions, NH₃-N removal efficiency was over 90%, and NH₃-N concentration was less than 3 mg/L.

Key words: Ti/SnO₂-Sb₂O₅-CuO electrode; electrochemical oxidation; dyeing wastewater; ammonium