Heterogeneous Catalytic Oxidation of Methyl Orange Dye by Copper(II)–Benzoic Acid Complex/NaHCO<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> System

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  • Sun Hong
    School of Chemistry and Chemical Engineering, Qiqihar University
  • Zhang Ze
    Qiqihar Environment Monitoring Center

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  • Heterogeneous Catalytic Oxidation of Methyl Orange Dye by Copper(Ⅱ)-Benzoic Acid Complex/NaHCO₃/H₂O₂ System

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Abstract

<p>Azo dye waste water is a serious problem because of the high yield, the low biodegradability and the high toxicity. In this work, the heterogeneous Fenton process was employed to degrade methyl orange (MO) using Copper(II)–benzoic acid (CuBA) as the catalyst in the HCO3− solution using H2O2 as the oxidant. CuBA was prepared by a complexing reaction. It was analyzed by FTIR and catalytic activity. The effects of different parameters on the degradation efficiency of the process were studied. The results were found that 90.8% MO degradation efficiency was achieved within 30 min under the best conditions of initial pH 7.0, 1.2 mM of CuBA, 25 mg/L of MO, 10 mM of NaHCO3 and 0.40 g/L (m/V) of H2O2 at 40°C. The kinetics of degradation of MO followed first-order reaction kinetics. A possible pathway of MO degradation was also proposed based on the detected intermediate products by UV-Vis, IR, mass spectrometry. MO was effectively degraded by CuBA/NaHCO3/H2O2 under the neutral and alkalic conditions. The CuBA/NaHCO3/H2O2 system overcomes the two problems faced by the homogeneous Fenton process.</p>

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