介孔碳修饰石墨电极处理模拟硝基苯废水

采用水热合成—高温碳化—涂饰的方法制备了介孔碳修饰石墨电极,并将其用于模拟硝基苯废水的电化学处理,考察了废水pH、电流密度、电解质投加量对处理效果的影响。表征结果显示,修饰电极表面具有丰富的介孔结构,因而比石墨电极具有更高的硝基苯去除率和苯胺生成量。实验结果表明,在废水pH为7.0、电流密度为15 mA/cm~2、电解质硫酸钠投加量为1.775 g/L的条件下处理初始硝基苯质量浓度为100 mg/L的模拟废水,电解3.0 h时的硝基苯去除率高达99.6%,苯胺生成量最高达45.54 mg/L。

Treatment of simulated nitrobenzene wastewater by mesoporous carbon-modified graphite electrode

The mesoporous carbon-modified graphite electrode was prepared by hydrothermal synthesis-high temperature carbonization-coating method and used for electrochemical treatment of simulated nitrobenzene wastewater. The effects of wastewater pH,current density and electrolyte amount were investigated. The characterization results showed that there were many mesoporous structures on the surface of the modified electrode,so that the nitrobenzene removal rate and aniline yield by it were higher than those by graphite electrode. The experimental results showed that under the conditions of wastewater pH 7.0,current density 15 mA/cm²,electrolyte Na₂SO₄ amount 1.775 g/L,electrolyzation time 3.0 h and initial nitrobenzene mass concentration 100 mg/L,the removal rate of nitrobenzene was up to 99.6% and the aniline yield reach 45.54 mg/L.