Adsorption of Cd(II) onto Activated Carbon Fiber Prepared by Urea Treatment

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  • Furuyado Mami
    Graduate School of Engineering, Chiba University
  • Ohba Tomonori
    Graduate School of Science, Chiba University
  • Amano Yoshimasa
    Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University
  • Machida Motoi
    Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University

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  • 尿素処理を施した活性炭素繊維によるCd(II)の吸着
  • ニョウソ ショリ オ ホドコシタ カッセイ タンソ センイ ニ ヨル Cd(Ⅱ)ノ キュウチャク

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The preparation of nitrogen-rich activated carbon can be achieved by the use of nitrogen-rich precursor or by the nitrogenous modification for carbon surface. In this study, the activated carbon fiber (ACF) was prepared from polyacrylonitrile (PAN) containing ca. 25 wt% nitrogen as a precursor. The prepared PAN-ACF was further treated by urea as a nitrogen medium to introduce the nitrogen functional groups after air oxidation treatment. The surface analysis of urea-treated PAN-ACF by X-ray photoelectron spectroscopy (XPS) revealed that the amount of negatively charged nitrogen species was relatively high compared to PAN-ACF. The result of Cd(II) adsorption experiment indicated that the amount of Cd(II) adsorption was increased in the order of commercial ACFs, PAN-ACF and urea-treated PAN-ACF. The examination of the effect of coexistence between Cd(II) and aromatic compound indicated that Cd(II) adsorbed on π electron clouds of the nitrogen-poor ACF, while not only π electron clouds but also newly introduced specific basic nitrogen/oxygen functional groups contributed to Cd(II) adsorption. These specific sites would not be affected by aromatic compounds.

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