Synergetic degradation of Cu(II)-Fe(II)-H₂O₂ for methyl orange

The effects of pH value, temperature, and the quantities of H₂O₂, Cu(II) and Fe(II) on the degradation efficiency of Cu(II)-Fe(II)-H₂O₂ for methyl orange(MO) were investigated, and the synergetic catalytic effects of Cu(II) and Fe(II) on the catalytic oxidation for methyl orange were found. The mechanism of producing hydroxyl radicals by Cu(II) or Fe(II) and its catalytic oxidation mechanism for methyl orange were proposed, and the overall oxidation dynamic equation was obtained. The results show that the optimum conditions of degrading 200 mL methyl orange simulated wastewater are obtained as follows: the concentration of 1.5 g/L, pH 3.0, temperature 60°C, H₂O₂ 10.0 mg/L, CuSO₄ 4.0 g/L and FeSO₄ 0.1 g/L. The constant of reaction rate is 0.943 min^-1. The degradation rate of Cu(II)-Fe(II)-H₂O₂ for methyl orange is high, i.e. methyl orange can be completely degraded within 5 min.