碳纳米管负载纳米零价铁去除水中多氯联苯

Removal of Polychlorinated Biphenyls from Water by Nanoscale Zerovalent Iron Supported on Carbon Nanotube

采用液相还原法制备了碳纳米管负载纳米零价铁(MWCNT-nZVI)复合材料,并通过BET和XRD对该复合材料进行了结构表征。同时,比较了nZVI、MWCNT和MWCNT-nZVI对多氯联苯(PCBs)的去除效果,探究了MWCNT-nZVI投加量、温度、pH值和PCBs初始浓度对PCBs去除率的影响。试验结果表明,相同条件下MWCNT-nZVI对PCBs的去除率(71. 98%)高于MWCNT(63. 84%)和nZVI(41. 18%),且去除过程符合伪一级反应动力学模型。当MWCNT-nZVI投加量为1. 6 g/L、温度为25℃、pH值为7、PCBs初始浓度为1. 4 mg/L时,MWCNT-nZVI对PCBs的去除效果最好。

Composites of nanoscale zerovalent iron supported on carbon nanotubes ( MWCNTnZVI )were prepared by liquid phase reduction method, and their structure was characterized by BET and XRD. The removal efficiency of polychlorinated biphenyls (PCBs) by nZVI, MWCNT and MWCNTnZVI was compared, and the effect of different reaction conditions including MWCNT-nZVI dosage, temperature, initial pH value and initial PCBs concentration on the removal of PCBs was investigated. The results indicated that the removal rate of PCBs by MWCNT-nZVI (71.98%) was higher than that by MWCNT (63. 84%) and nZVI (41.18%) under the same reaction condition, and the removal process was consistent with the pseudo-first-order reaction kinetic model. The MWCNT-nZVI composites showed the best removal effect on PCBs, when the MWCNT-nZVI dosage was 1.6 g/L, the temperature was 25 ℃, the initial pH value was 7 and the initial PCBs concentration was 1.4 mg/L.