超声波/零价铁降解对硝基苯胺的试验研究

对在超声波、零价铁和超声波/零价铁(U/Fe0)等体系中对硝基苯胺的降解规律进行了研究。研究结果表明,对硝基苯胺在超声波作用下,降解规律符合一级反应动力学模型,但超声波对高浓度的对硝基苯胺降解效果较差。在U/Fe0体系中,超声波和零价铁对降解对硝基苯胺具有协同作用,对硝基苯胺降解速率显著提高。降解机理显示,对硝基苯胺在零价铁表面上发生原电池反应,被还原为对苯二胺,在超声波作用下进一步降解。在U/Fe0体系中添加Cu2+,形成Fe/Cu原电池,可进一步促进对硝基苯胺的降解速率,降解效率优于铸铁屑形成的Fe/C原电池。

Degradation of p-nitroaniline by ultrasound and zero-valent iron

In this paper, the degradation of p nitroaniline was investigated primarily in ultrasound ,zero valent iron,ultrasound and zero valent iron systems(U/Fe 0). The results indicate that the degradation of p nitroaniline follows first order kinetics model under ultrasound irradiation, only low degradation efficiency, however, can be obtained for p nitroaniline in high concentration. In ultrasound and zero valent iron system, a synergic effect for p nitroaniline degradation is observed and the degradation rate of p nitroaniline is improved markedly compared to sonication or zero valent iron. It is also shown that p nitroaniline is firstly reduced into p dianiline by zero valent iron, and is further decomposed under ultrasound irradiation. In the presence of Cu 2+ in U/Fe 0 system, the generation of new Fe/Cu primary battery markedly enhances the degradation rate of p nitroaniline.