EAOP(电化学高级氧化)作为一种前景广阔的技术,广泛应用于工业水处理领域,其中阳极材料是EAOP的核心.采用等离子喷涂法制备多孔Ti/Ti4O7电极,对其性能进行结构表征和电化学测试.考察电流密度、通量、电解质种类对处理效果的影响,并对电化学氧化过程及污染物氧化机理进行分析.在最佳实验条件电流密度为15 mA/cm2、通量为400 L/(m2·h)下,选择0.1 mol/LNa2SO4为支持电解质,废水中COD(化学需氧量)的去除率为75.3％,去除1 kg COD的能耗为110.14 kW·h,能够有效去除水中PAHs(多环芳烃).因此,制备的Ti/Ti4O7电极在电化学氧化实际废水中有机物的工程实践方面具备很强的应用前景.
Ti/Ti4O7 electrode for electrochemical oxidation of organic compounds in coking water
EAOP(electrochemical advanced oxidation processes)is widely applied in the field of industrial wastewater treatment,and the anode material is a key factor that affects the EAOP treatment efficiency.Porous Ti/Ti4O7 electrode was prepared by spraying Ti4O7 powder onto porous Ti substrate by plasma spraying method.The properties of Ti/Ti4 O7 electrodes were characterized by XRD(X-ray diffractometry),SEM(scanning electron microscopy),EDS(energy dispersive spectroscopy)and mercury injection analysis.The effect of current density,membrane flux and electrolyte type on treatment efficiency was examined.The electrochemistry oxidation process and mechanism were analyzed.Under current density of 15 mA/cm2 and membrane flux of 400 L/(m2·h),0.1 mol/L Na2SO4 as supporting electrolyte,the Ti/Ti4O7 electrode has a COD removal rate of 75.3％and the energy consumption of removal 1 kg COD was 110.14 kW·h,which can effectively remove PAHs(polycyclic aromatic hydrocarbons)in water.The Ti/Ti4O7 electrode prepared demonstrates satisfactory performance and strong stability in actual organic wastewater,and has a strong potential for application in the field of engineering practice.
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