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首页> 外文期刊>RSC Advances >Surface modification of banana stem fibers via radiation induced grafting of poly(methacrylic acid) as an effective cation exchanger for Hg(II)
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Surface modification of banana stem fibers via radiation induced grafting of poly(methacrylic acid) as an effective cation exchanger for Hg(II)

机译：通过辐射诱导香蕉茎纤维的表面改性聚（甲基丙烯酸）作为HG（II）的有效阳离子交换剂

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摘要

A low cost adsorbent, banana stem fibers (BSFs), was used for modification by grafting with methacrylic acid via three free radical generation methods. The presence of poly(methacrylic acid) on the adsorbent surface was verified by FTIR, ESR and TG analyses. BSFs grafted via beta-radiation (BSF-beta) were proven to have a higher grafting yield which led to a higher Hg(II) adsorption capacity. A slight decrease in the equilibrium pH after the adsorption process was probably due to BSF-beta acting as an acid-form ion-exchanger. The adsorption equilibrium uptake fitted well with the Freundlich isotherm model implying that Hg(II) adsorption occurred heterogeneously on the adsorption sites. The kinetics of adsorption follows a pseudo-first order model with an activation energy of 13.7 kJ mol(-1) indicating that the adsorption undergoes an ion-exchange process. Thermodynamic studies illustrated that that the Hg(II) adsorption process was endothermic and non-spontaneous. Spent BSF-beta was effectively regenerated with 0.1 M HCl and could be reused without any significance efficiency loss over at least six cycles of adsorption. The present investigation shows that BSF-beta is a promising adsorbent for the removal and recovery of Hg(II) ions from aqueous solutions.
机译：低成本吸附剂，香蕉茎纤维（BSF）通过通过三种自由基产生方法接枝与甲基丙烯酸接枝而改性。通过FTIR，ESR和TG分析验证了吸附表面上聚（甲基丙烯酸）的存在。经过β-辐射（BSF-β）接枝的BSF被证明具有更高的接枝产率，导致HG（II）的吸附能力较高。在吸附过程之后的平衡pH值可能是由于BSF-β作为酸性离子交换剂的BSF-β。对Freundlich等温模型的吸附平衡摄取孔隙均匀，暗示HG（II）吸附在吸附位点上异质地发生。吸附动力学遵循伪第一阶模型，其活化能量为13.7 kJ摩尔（-1），表明吸附经历离子交换过程。热力学研究表明，HG（II）吸附过程是吸热和非自发性的。用0.1M HCl有效地再生BSF-β并可在没有任何显着性效率损失的情况下重复再生，在至少六个吸附循环中没有任何重要效率损失。本研究表明，BSF-β是一种有望的吸附剂，用于从水溶液中除去和回收Hg（II）离子的溶液。

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  • 来源
    《RSC Advances》 |2016年第41期|共11页
  • 作者

    Salamun N.; Triwahyono S.; Jalil A. A.; Majid Z. A.; Ghazali Z.; Othman N. A. F.; Prasetyoko D.;

  • 作者单位

    Univ Teknol Malaysia UTM Fac Sci Dept Chem Johor Baharu 81310 Johor Malaysia;

    Univ Teknol Malaysia UTM Fac Sci Dept Chem Johor Baharu 81310 Johor Malaysia;

    Univ Teknol Malaysia UTM Fac Chem &

    Energy Engn Dept Chem Engn Johor Baharu 81310 Johor Malaysia;

    Univ Teknol Malaysia UTM Fac Sci Dept Chem Johor Baharu 81310 Johor Malaysia;

    Agensi Nuklear Malaysia Radiat Proc Technol Kajang 43000 Selangor Malaysia;

    Agensi Nuklear Malaysia Radiat Proc Technol Kajang 43000 Selangor Malaysia;

    Inst Teknol Sepuluh Nopember Dept Chem Keputih Sukolilo 60111 Surabaya Indonesia;

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  • 正文语种 eng
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