Plasma Induced Multiwalled Carbon Nanotube Grafted with 2‐Vinylpyridine for Preconcentration of Pb(II) from Aqueous Solutions
Plasma Induced Multiwalled Carbon Nanotube Grafted with 2‐Vinylpyridine for Preconcentration of Pb(II) from Aqueous Solutions
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DOI：
10.1002/ppap.201000192
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发表时间：
2011-07
影响因子：
3.5
通讯作者：
X. Ren;D. Shao;Guixia Zhao;G. Sheng;Junjie Hu;Shi-yong Yang;Xiangke Wang
中科院分区：
文献类型：
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作者：
X. Ren;D. Shao;Guixia Zhao;G. Sheng;Junjie Hu;Shi-yong Yang;Xiangke Wang
采用N2等离子体技术对多壁碳纳米管（MWCNTs）进行了2-乙烯基吡啶（VP）接枝改性。采用X射线衍射、X射线光电子能谱和热重-差热分析对VP接枝MWCNT（MWCNT-g-VP）进行表征。在环境条件下研究了多壁碳纳米管和多壁碳纳米管-g-VP在去除大体积废水中Pb（II）中的应用。结果表明，接枝VP后的MWCNT对Pb（II）的吸附能力明显提高。接枝到MWCNT‐g‐VP表面的VP分子可以阻止MWCNT‐g‐VP的缠结，并提供更多的官能团，促进Pb（II）在MWCNT‐g‐VP上的吸附。Langmuir模型模拟结果表明，pH = 6.0时，MWCNTs和MWCNT-g-VP对Pb（II）的最大吸附容量分别为15.9 mg·g-1和37.0 mg·g-1。分离因子的变化表明，Pb（II）在MWCNTs和MWCNT-g-VP上的吸附是有利的。相对较高的吸附容量表明MWCNT‐g‐VP是环境污染管理中从大体积水溶液中预富集和固定重金属离子的合适材料。
Multiwalled carbon nanotubes (MWCNTs) are grafted with 2‐vinylpyridine (VP) by using N2plasma technique. The VP grafted MWCNTs (MWCNT‐g‐VP) are characterized by using X‐ray diffraction, X‐ray photoelectron spectroscopy, and thermo‐gravimetric analysis‐differential thermal analysis. The application of MWCNTs and MWCNT‐g‐VP in the removal of Pb(II) from large volumes of wastewater is investigated under ambient conditions. The results indicate that the grafted VP improved MWCNT sorption capacity obviously in the removal of Pb(II). The VP molecules grafted on the surfaces of MWCNT‐g‐VP can prevent the entanglement of MWCNT‐g‐VP and provide more functional groups, promoting the sorption of Pb(II) onto MWCNT‐g‐VP. According to the results simulated by Langmuir model, the maximum sorption capacities (Csmax) of Pb(II) are ∼15.9 mg·g−1on MWCNTs and ∼37.0 mg·g−1on MWCNT‐g‐VP at pH = 6.0. The variation of separation factors indicates that the sorption of Pb(II) on MWCNTs and MWCNT‐g‐VP is favorable. The relatively high sorption capacity shows that MWCNT‐g‐VP is a suitable material for the preconcentration and immobilization of heavy metal ions from large volumes of aqueous solutions in environmental pollution management.