Removal of Pb(II) from aqueous solution by oxidized multiwalled carbon nanotubes
Removal of Pb(II) from aqueous solution by oxidized multiwalled carbon nanotubes
复制标题
氧化多壁碳纳米管去除水溶液中的 Pb(II)
DOI：
10.1016/j.jhazmat.2007.10.059
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发表时间：
2008-06-15
影响因子：
13.6
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Xu, Di;Tan, Xiaoli;Wang, Xiangke
以氧化多壁碳纳米管（MWCNTs）为吸附剂，采用间歇吸附法研究了在室温条件下接触时间、pH、离子强度、杂质离子和MWCNTs含量对水溶液中Pb（II）的吸附特性。结果表明，吸附的Pb（II）氧化多壁碳纳米管是强烈依赖于pH值，和独立的离子强度和外来离子的类型。Pb（II）的去除氧化的多壁碳纳米管是相当快的动力学吸附可以很好地描述由伪二级模型。Pb（II）的吸附主要以表面络合作用为主，而不是离子交换作用。从水溶液中有效去除Pb（II）的限制在pH 7-10。X射线光电子能谱（XPS）进行研究的吸附机制在分子水平上，从而确定的物种的吸附过程。pH、C-eq和q的三维关系表明，对于相同的Pb（11）初始浓度和相同的氧化MWCNTs含量，所有实验数据的C-eq - q均位于斜率为- V/m、截距为C 0 V/m的直线上。(C)2007 Elsevier B. V.保留所有权利。
Oxidized multiwalled carbon nanotubes (MWCNTs) were employed as sorbent to study the sorption characteristic of Pb(II) from aqueous solution as a function of contact time, pH, ionic strength, foreign ions, and oxidized MWCNTs' contents under ambient conditions using batch technique. The results indicate that sorption of Pb(II) on oxidized MWCNTs is strongly dependent on pH values, and independent of ionic strength and the type of foreign ions. The removal of Pb(II) to oxidized MWCNTs is rather quickly and the kinetic sorption can be described by a pseudo-second-order model very well. Sorption of Pb(II) is mainly dominated by surface complexation rather than ion exchange. The efficient removal of Pb(II) from aqueous solution is limited at pH 7-10. X-ray photoelectron spectroscopy (XPS) is performed to study the sorption mechanism at a molecular level and thereby to identify the species of the sorption processes. The 3-D relationship of pH, C-eq and q indicates that all the data of C-eq - q lie in a straight line with slope - V/m and intercept C0V/m for the same initial concentration of Pb(11) and same content of oxidized MWCNTs of each experimental data. (C) 2007 Elsevier B.V. All rights reserved.