Adsorption of Ni(II) on oxidized multi-walled carbon nanotubes: Effect of contact time, pH, foreign ions and PAA
Adsorption of Ni(II) on oxidized multi-walled carbon nanotubes: Effect of contact time, pH, foreign ions and PAA
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Ni(II) 在氧化多壁碳纳米管上的吸附：接触时间、pH、外来离子和 PAA 的影响
DOI：
10.1016/j.jhazmat.2008.11.003
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发表时间：
2009-07-15
影响因子：
13.6
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Yang, Shitong;Li, Jiaxing;Wang, Xiangke
采用间歇吸附法研究了聚丙烯酸（PAA）存在和不存在时，Ni（II）在氧化多壁碳纳米管（MWCNTs）上的吸附行为与吸附时间、pH值和外来离子的关系。结果表明，在pH 2-9范围内，Ni（II）在氧化MWCNTs上的吸附量从0增加到接近99%，然后随着pH值的增加保持较高水平。动力学数据表明，吸附过程在2 h内达到平衡，实验数据符合准二级动力学方程。PAA对Ni（II）的吸附在pH < 8时有正效应，而在pH > 8时有负效应。研究了PAA/Ni（II）的加入顺序对PAA-MWCNT杂化物吸附Ni（II）的影响。结果表明，添加顺序对Ni（II）的吸附有明显影响. Ni（II）在氧化MWCNTs上的吸附主要是通过表面络合和离子交换作用实现的。氧化的MWCNT是从水溶液中固化和预浓缩Ni（II）的合适材料。(C)2008 Elsevier B. V.保留所有权利。
The adsorption of Ni(II) on oxidized multi-walled carbon nanotubes (MWCNTs) as a function of contact time, pH and foreign ions in the absence and presence of polyacrylic acid (PAA) was studied using batch technique. The results indicated that adsorption of Ni(II) on oxidized MWCNTs increased from zero to similar to 99% at pH 2-9, and then maintained the high level with increasing pH. Kinetic data showed that the adsorption process achieved equilibrium within 2 h and experimental data were fitted well by the pseudo-second-order equation. A positive effect of PAA on Ni(II) adsorption was found at pH < 8, whereas a negative effect was observed at pH > 8. The effect of addition sequences of PAA/Ni(II) on the adsorption of Ni(II) to PAA-MWCNT hybrids were also studied. The results indicated that the adsorption of Ni(II) was influenced by addition sequences obviously. The adsorption of Ni(II) on oxidized MWCNTs may be mainly attributed to surface complexation and ion exchange. Oxidized MWCNTs are suitable material in the solidification and pre-concentration of Ni(II) from aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved.