DSA类电极催化降解硝基苯及其动力学研究

Study on Catalytic Degradation of Nitrobenzene Wastewater Using DSA- typed Anodes and Its Kinetics

用新兴的电化学催化系统,采用特殊工艺自制的DSA类电极作为阳极,对模拟硝基苯废水进行了降解处理。结果表明,最佳试验条件为:电流密度15mA/cm2.NazSO4浓度5g/L、pH以中性和碱性较好。在合适的条件下,硝基苯废水CODcr去除率可达到90％以上,DSA类电极能有效地催化降解硝基苯。对试验结果进行的非线性最小二乘法分析表明,硝基苯在电化学催化系统中的降解过程符合一级反应模型,在硝基苯质量浓度200mg/L、pH11.0、Na2SO4浓度10g/L、电流密度15mA/cm2的试验条件下,CODcr去除速率常数为0.0395min-1。

It's necessary to use other method for degrading nitrobenzene which is a refractory organic matter, self-made DSA(Dimensionally Stable Anodes)-typed an-odes, with special technology have been employed in electrochemical catalytic system to treat nitrobenzene waste water. The optimal condition has been obtained in this study, range:current density 15mA-cm-2, con-centration of Na2SO4 5g-L-1,pH neutral or alkaline.On appropriate condition, degradation percentage of nitrobenzene could be over 90%, which indicated that nitrotoenzene could be degraded by the DSA-typed anodes effectively. The non-liner least-square algo-rithm of the experimental data according to the theory analysis showed that the degradation process of ni-trobenzene could-be described by pseudo first-order kinetics well, with the CODcr removal rate constant 0.0395min-1 in the study.