Sb-Dy-SnO2/Ti电极的制备及其对石化污水反渗透浓水的电催化氧化处理

通过掺杂少量过渡金属Sb和稀土元素Dy，利用复合电沉积—高温氧化法制备Sb-Dy-SnO2/Ti电极，并应用该电极对石化污水反渗透浓水（COD=120~260 mg/L、pH=6.5~7.5）进行电催化氧化实验。实验结果表明：在n（Sb）∶n（Sn）=0.05、n（Dy）∶ n（Sn）=0.015、焙烧温度650 ℃、焙烧时间2 h的条件下，制备的Sb-Dy-SnO2/Ti电极具有良好的导电性及电催化活性;以在上述条件下制得的Sb-Dy-SnO2/Ti电极为工作电极，在进水COD 220 mg/L、电流密度15 mA/cm2、废水pH 7.2、反应时间90 min的条件下，出水COD为47 mg/L，COD去除率为79.1%，达到DB 21/1627—2008《辽宁省污水综合排放标准》中的废水排放要求（COD≤50 mg/L）。

Preparation of Sb-Dy-SnO2/Ti Electrode and Electro-catalytic Oxidation Treatment of Reverse Osmosis Concentrated Petrochemical Wastewater

Sb-Dy-SnO2/Ti electrode doped with a few Sb and Dy was prepared by composite electrodeposition and pytolysis oxidation，and was used in the electro-catalytic oxidation treatment of reverse osmosis concentrated petrochemical wastewater (COD=120-260 mg/L，pH=6.5-7.5). The experimental results show that：Under the conditions of n(Sb)∶n(Sn)=0.05，n(Dy)∶n(Sn)=0.015，calcination temperature 650 ℃ and calcination time 2 h，the Sb-Dy-SnO2/Ti electrode has a good conductivity and electro-catalytic activity;When the influent COD is 220 mg/L，the current density is 15 mA/cm2，the wastewater pH is 7.2 and the reaction time is 90 min，the effluent COD is 47 mg/L，the COD removal rate is 79.1%，which can meet the discharge requirement of DB 21/1627-2008 (COD≤50 mg/L).