Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, People's Republic of China.
J Hazard Mater. 2012 Jul 30;225-226:36-45. doi: 10.1016/j.jhazmat.2012.04.061. Epub 2012 May 4.
Nanoscale Pd/Fe particles were combined with multi-walled carbon nanotubes (MWNTs) to prepare supported particles (MWNT-stabilized Pd/Fe), which were used to remove 2,4-dichlorophenol (2,4-DCP). The adsorption capacity of MWNTs was found to be increased with the increasing amount of chlorine atoms, and the removal rates of phenol (P), 2-chlorophenol (2-CP), 4-chlorophenol (4-CP) and 2,4-DCP reached 19.7%, 60.5%, 72.0% and 95.1% respectively, in 1min by MWNTs due to π-π interaction. The adsorption kinetics and adsorption isotherm were also discussed. MWNTs as a supporter, was effective for avoiding the agglomeration of nZVI. Furthermore, the speedy removal efficiency of the initial substances (2,4-DCP) reached about 50% in 1min, and over the time continued to rise to 100%, remaining low concentrations (<1mg L(-1)) of the intermediate substances (o-CP, p-CP), and gradual release of the final substance (P) from MWNT-stabilized Pd/Fe composites during the whole process, proposed a novel method for in situ remediation technology.
纳米级 Pd/Fe 颗粒与多壁碳纳米管 (MWNTs) 结合，制备负载型颗粒 (MWNT 稳定的 Pd/Fe)，用于去除 2,4-二氯苯酚 (2,4-DCP)。发现 MWNTs 的吸附容量随氯原子数量的增加而增加，MWNTs 在 1min 内对苯酚 (P)、2-氯苯酚 (2-CP)、4-氯苯酚 (4-CP) 和 2,4-DCP 的去除率分别达到 19.7%、60.5%、72.0%和 95.1%，这是由于π-π 相互作用。还讨论了吸附动力学和吸附等温线。MWNTs 作为一种载体，有效地避免了 nZVI 的团聚。此外，初始物质（2,4-DCP）的快速去除效率在 1min 内达到约 50%，并且随着时间的推移继续上升到 100%，中间物质（邻氯苯酚，对氯苯酚）的浓度保持在低水平（<1mg L(-1))，最终物质（苯酚）从 MWNT 稳定的 Pd/Fe 复合材料中逐渐释放，为原位修复技术提供了一种新方法。
