Factors influencing the dechlorination of 2,4-dichlorophenol by Ni–Fe nanoparticles in the presence of humic acid》.pdf

Journal of Hazardous Materials 165 (2009) 78–86 Contents lists available at ScienceDirect Journal of Hazardous Materials j o u rn al h omepage: w w w. elsev /locate/jha z mat Factors influencing the dechlorination of 2,4-dichlorophenol by Ni–Fe nanoparticles in the presence of humic acid Zhen Zhang a,b , Naman Cissoko a , Jingjing Wo a , Xinhua Xu a,∗ a Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China b School of Bioscience, Taizhou University, Linhai 317000, People’s Republic of China a r t i c l e i n f o a b s t r a c t Article history: The dechlorination of 2,4-dichlorophenol (2,4-DCP) by Ni–Fe nanoparticles in the presence of humic Received 26 May 2008 acid (HA) was investigated to understand the feasibility of using Ni–Fe for the in situ remediation of Received in revised form 8 September 2008 contaminated groundwater. 2,4-DCP was first adsorbed by Ni–Fe nanoparticles, then quickly reduced to Accepted 19 September 2008 o-chlorophenol (o-CP), p-chlorophenol (p-CP), and finally to phenol (P). However, the introduction of HA Available online 27 September 2008 decreased the removal percentage of 2,4-DCP, as a result, the phenol production rates dropped from 86% (in the absence of HA) to 29% within 2 h. Our data suggested that the dechlorination rate was dependent Keywords: on a number of factors including Ni–Fe avai