Characterization of nanoscale iron and its degradation of 2,4-dichlorophenol  

作　　者：HOU ChunFeng GE XiaoPeng ZHOU YanMei LI Yi WANG DongSheng TANG HongXiaoI 

机构地区：[1]State Key Laboratory of Environmental Aquatic Chemistry, RCEES, Chinese Academy of Sciences, Beijing 100085, China [2]School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China [3]Nanotechnology Center, Central lron and Steel Research Institute, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2010年第4期350-357,共8页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 20677073,20537020);the Major State Basic Re-search Development Program of China (Grant No. 2007CB407304)

摘　　要：Nanoscale iron was detected by TEM, X-ray diffraction and X-ray photoelectron spectroscopy. It was found that the size of the nanoscale iron particles is in the range of 30?40 nm according to TEM image, and it contains abundant Fe3O4 as passivating layers on the surface of the core-shell structure. To improve its performance, dilute HCl was used for the removal of the passivating layers, and the degradation of 2,4-dichlorophenol (2,4-DCP) was measured for the nanoscale iron samples treated and untreated. Experimental results demonstrated that the removal of 2,4-DCP by untreated nanoscale iron is mainly due to the adsorption of 2, 4-DCP by nanoscale iron, and there are no degradation products detected by HPLC in the process. However, excellent dechlorination of 2,4-DCP was gained by HCl-treated nanoscale iron, and 2-chlorophenol, 4-chlorophenol and phenol were detected during the process. It was concluded that dechlorination is the key reaction pathway for the degradation of 2,4-DCP by activated nanoscale iron, and phenol is found to be the main product.Nanoscale iron was detected by TEM, X-ray diffraction and X-ray photoelectron spectroscopy. It was found that the size of the nanoscale iron particles is in the range of 30-40 nm according to TEM image, and it contains abundant Fe304 as passivating layers on the surface of the core-shell structure. To improve its performance, dilute HC1 was used for the removal of the passivating layers, and the degradation of 2,4-dichlorophenol （2,4-DCP） was measured for the nanoscale iron samples treated and untreated. Experimental results demonstrated that the removal of 2,4-DCP by untreated nanoscale iron is mainly due to the adsorption of 2, 4-DCP by nanoscale iron, and there are no degradation products detected by HPLC in the process. However, excellent dechlorination of 2,4-DCP was gained by HCl-treated nanoscale iron, and 2-chlorophenol, 4-chlorophenol and phenol were detected during the process. It was concluded that dechlorination is the key reaction pathway for the degradation of 2,4-DCP by activated nanoscale iron, and phenol is found to be the main product.

关 键 词：二氯苯酚 纳米铁 降解反应 X射线光电子能谱 透射电子显微镜 表征 高效液相色谱 检测过程 

分 类 号：TQ243.3[化学工程—有机化工] TB383[一般工业技术—材料科学与工程]