有机膨润土负载纳米铁去除废水中硝基苯

用具有良好吸附能力的有机膨润土作载体,通过FeSO4与NaBH4反应制得负载型的纳米铁(NZVL/CTMAB-Bent),用XRD、BET对其性能进行了表征.以硝基苯为目标污染物,试验了 -NZVI/CTMAB-Bent对不同起始浓度硝基苯的去除作用,考察了介质PH对其去除效率的影响,并与相同铁含量的纳米铁(NZVI)进行了比较.此外.还对NZVI/CTMAB-Bent还原硝基苯的机理进行了探讨.结果表明,NZVI/CTMAB-Bent对硝基苯的去除能力远高于相同铁含量的NZVI.也明显优于相同含量的有机膨润土和相同铁含量的NZVI对硝基苯去除率的加和.

Removal of nitrobenzene from synthetic wastewater by nanoscale zero-valent iron supported on organobentonite

Nanoscale zero-valent iron (NZVI) supported on an organobentonite(CTMAB-Bent)was prepared by the reaction of NaBH₄ and FeSO₄.The supported NZVI was characterized by XRD and BET.The effects of pH and initial nitrobenzene concentration on the removal rate of nitrobenzene by NZVI/CTMAB-Bent were investigated,and the results were compared with that obtained from unsupported NZVI.In addition,the mechanism of the reduction of nitrobenzene by NZVI/CTMAB-Bent is proposed and discussed.The results indicate that the nitrobenzene removal rate by NZVI/CTMAB-Bent is much higher than that by NZVI containing the same amount of iron,and is superior to the sum of the removal rates of nitrobenzene by NZVI and organobentonite separately(containing the same amount of clay as the NZVI/CTMAB-Bent combination.)