Effect of surfactants on Pb(II) adsorption from aqueous solutions using oxidized multiwall carbon nanotubes
Effect of surfactants on Pb(II) adsorption from aqueous solutions using oxidized multiwall carbon nanotubes
复制标题
表面活性剂对氧化多壁碳纳米管从水溶液中吸附 Pb(II) 的影响
DOI：
10.1016/j.cej.2010.11.018
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发表时间：
2011-01-15
影响因子：
15.1
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Li, Jiaxing;Chen, Shuyu;Wang, Xiangke
Batch experiments were conducted to elucidate the adsorption of Pb(II) and three types of widely used surfactants (sodium dodecylbenzene sulfonate (SDBS), octyl-phenol-ethoxylate (TX-100), and benzalkonium chloride (BKC)) from aqueous solutions by using oxidized multiwall carbon nanotubes (OMWCNTs). The effect of each kind of surfactant on the adsorption of Pb(II) and vice versa were studied in detail. The results indicated that the pH values affected the adsorption of Pb(II). TX-100 and BKC to OMWCNTs dramatically, whereas the adsorption of SDBS was almost pH-independent at pH < 9 and then decreased with increasing pH at pH > 9. The adsorption of Pb(II) was enhanced obviously by the presence of SDBS, but slightly inhibited by the presence of BKC. The adsorption of Pb(II) can be well described by Langmuir model. The adsorption process in the Pb-surfactant-OMWCNT ternary system was attributed to electrostatic, hydrophobic and pi-pi interactions. XPS analysis showed that the adsorption mechanism was mainly due to chemical interaction between Pb(II) and the surface functional groups of OMWCNTs and the surfactants. (C) 2010 Elsevier B.V. All rights reserved.
