Electrochemical Removal of Ammonia in Coking Wastewater Using Ti/SnO_2+Sb_2O_3/PbO_2 Anode

摘要

The ammonia in coking wastewater was treated by electrochemical oxidation using Ti/SnO_2+Sb_2O_3/PbO_2 as anode. The Ti/SnO_2+Sb_2O_3/PbO_2 anode was prepared by the combination technology of thermal decomposition and electrodeposition. The electrode surface morphology, structure phase and composition valent state were characterized by SEM, XRD and XPS. The effect of operating parameters including current density, anode material, pH and the concentration of chloride were inspected by orthogonal array experimental design. The results show that anode material, current density, and chloride concentration have significant influences on the ammonia removal, and 250mg/L ammonia was removed totally within 60 minutes with Ti/SnO_2-Sb_2O_3/PbO_2 anode at 0.05A/cm~2 current density, and the Ti/SnO_2-Sb_2O_3/PbO_2 anode with higher oxygen evolution over-potential and longer lifetime is the prensent most promising anode material for elelctrochemical wastewater treatment.