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首页> 外文期刊>Environmental Pollution >Simultaneous removal of acid green 25 and mercury ions from aqueous solutions using glutamine modified chitosan magnetic composite microspheres
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Simultaneous removal of acid green 25 and mercury ions from aqueous solutions using glutamine modified chitosan magnetic composite microspheres

机译：用谷氨酰胺修饰的壳聚糖磁性复合微球同时去除水溶液中的酸性绿25和汞离子

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摘要

In this current work, the magnetic composite microsphere containing glutamine modified chitosan and silica coated Fe3O4 nanoparticles (CS-Gln-MCM) has been successfully prepared and extensively characterized, which is a kind of biodegradable materials. CS-Gln-MCM shows enhanced removal efficiency for both acid green 25 (AG25), an amphoteric dye, and mercury ions (Hg2+) from water in the respective while measured pH range compared with chitosan magnetic composite microsphere (CS-MCM) without modification. It is due to the fact that the grafted amino acid provides a variety of additional adsorption active sites and diverse adsorption mechanisms are involved. In AG25 and Hg2+ aqueous mixture, the modified adsorbents bear preferential adsorption for AG25 over Hg2+ in strong acidic solutions ascribed to multiple interactions between AG25 and CS-Gln-MCM, such as hydrogen bonding and electrostatic interactions. While, in weak acidic conditions, an efficient simultaneous removal is observed for different adsorption effects involved in aforementioned two pollutants. Besides, CS-Gln-MCM illuminates not only short equilibrium time for adsorption of each pollutant less than 20.0 min but also rapid magnetic separation from water and efficient regeneration after saturated adsorption. Therefore, CS-Gln-MCM bears great application potentials in water treatment. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在目前的工作中，已成功制备并广泛表征了包含谷氨酰胺改性的壳聚糖和二氧化硅包覆的Fe3O4纳米颗粒的磁性复合微球（CS-Gln-MCM），它是一种可生物降解的材料。与未经修饰的壳聚糖磁性复合微球（CS-MCM）相比，CS-Gln-MCM在测量的pH范围内分别从水中去除了酸性绿25（AG25），两性染料和汞离子（Hg2 +）的去除效率得到了提高。由于这一事实，接枝的氨基酸提供了多种附加的吸附活性位点，并且涉及多种吸附机理。在AG25和Hg2 +的水性混合物中，由于AG25和CS-Gln-MCM之间存在多种相互作用（例如氢键和静电相互作用），因此在强酸性溶液中，改性剂对AG25的吸附优先于Hg2 +。而在弱酸性条件下，对于上述两种污染物所涉及的不同吸附效果，可以同时有效去除。此外，CS-Gln-MCM不仅能在不到20.0分钟的时间内使每种污染物的吸附平衡时间短，而且还能实现与水的快速磁分离和饱和吸附后的高效再生。因此，CS-Gln-MCM在水处理中具有巨大的应用潜力。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Environmental Pollution》 |2016年第2期|21-29|共9页
  • 作者

    Tao Xue; Li Kun; Yan Han; Yang Hu; Li Aimin;

  • 作者单位

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Glutamine modified chitosan magnetic composite microspheres; Acid green 25; Hg2+; Simultaneous removal; Adsorption mechanism;

    机译：谷氨酰胺修饰的壳聚糖磁性复合微球;酸性绿25;Hg2 +;同时去除;吸附机理;

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