Removal of U(VI) from aqueous solutions by using MWCNTs and chitosan modified MWCNTs

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• 作者：Jian-Hui Chen (1) (2)
  Ding-Qiang Lu (1)
  Bin Chen (2)
  Ping-Kai OuYang (1)
  
• 关键词：MWCNT ; CS ; MWCNTs ; U(VI) ; Sorption ; pH ; Ionic strength
• 刊名：Journal of Radioanalytical and Nuclear Chemistry
• 出版年：2013
• 出版时间：March 2013
• 年：2013
• 卷：295
• 期：3
• 页码：2233-2241
• 全文大小：768KB
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• 作者单位：Jian-Hui Chen (1) (2)
  Ding-Qiang Lu (1)
  Bin Chen (2)
  Ping-Kai OuYang (1)
  
  1. School of Pharmaceutical Science, Nanjing University of Technology, Xinmofan Road No. 5, Nanjing, 210009, People’s Republic of China
  2. School of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang, 312000, People’s Republic of China
  
• ISSN：1588-2780

文摘

In this paper, the multiwalled carbon nanotubes (MWCNTs) were modified with chitosan (CS) by using low temperature plasma grafting technique (denoted as MWCNT-CS). The prepared MWCNTs and MWCNT-CS were characterized by SEM, TEM, FTIR and Raman spectroscopy in detail and the results suggested that CS molecules were successfully grafted on the surfaces of MWCNTs. The materials were applied as adsorbents in the removal of U(VI) ions from large volumes of aqueous solutions as a function of environmental conditions. The removal of U(VI) from aqueous solution to MWCNTs and MWCNT-CS increased with increasing pH values at pH?<?7, and then decreased with increasing pH values at pH?>?7. The sorption of U(VI) on MWCNTs and MWCNT-CS was strongly dependent on pH and independent of ionic strength. The sorption of U(VI) on MWCNTs and MWCNT-CS was dominated by inner-sphere surface complexation rather than by ion exchange or outer-sphere surface complexation. The surface grafted chitosan molecules can enhances U(VI) sorption on MWCNTs obviously, which was also evidenced from the XPS spectroscopy analysis. The results of high sorption capacity of U(VI) on MWCNT-CS suggest that the MWCNT-CS nanomaterial is a suitable candidate in the preconcentration of U(VI) ions from large volumes of aqueous solutions.