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Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

机译：使用多孔羧甲基壳聚糖珠及其吸附机理从水溶液中快速除去CO（II）

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摘要

Porous carboxymethyl chitosan (PCMC) beads were synthesized via ionic coacervation/chemical crosslinking, using polyethylene glycol (PEG) as a porogen and calcium chloride and glutaraldehyde as physical and chemical cross-linkers. The as-synthesized PCMC beads were characterized using SEM, EDS, BET, TGA, FTIR and XPS analysis and then tested for the removal of Co(ii) from aqueous solution. The effects of the initial pH, Co(ii) concentration and temperature were investigated. It was found that the adsorption equilibrium is reached within 6 h and the maximum adsorption capacity is 46.25 mg g(-1). In addition, the kinetics and equilibrium data are well described by pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the desorption and re-adsorption performance was also studied, and the results revealed that the prepared new adsorbent still showed good adsorption performance after five cycles of regeneration. Finally, the adsorption mechanism, including chemical and physical adsorption, was proposed on the basis of the microstructure analysis, adsorption kinetics and isotherm results, and chemical adsorption was found to be the main adsorption mechanism during the process of the removal of Co(ii).
机译：通过离子凝聚/化学交联合成多孔羧甲基壳聚糖（PCMC）珠子，用聚乙二醇（PEG）作为致孔剂和氯化钙和戊二醛作为物理和化学交联剂。使用SEM，EDS，BET，TGA，FTIR和XPS分析表征了AS合成的PCMC珠粒，然后测试用于从水溶液中除去CO（II）。研究了初始pH，CO（II）浓度和温度的效果。结果发现，在6小时内达到吸附平衡，最大吸附能力为46.25mg（-1）。此外，通过伪二阶动力学和Langmuir等温线模型很好地描述了动力学和平衡数据。此外，还研究了解吸和再吸附性能，结果表明，在再生5个循环后，制备的新吸附剂仍显示出良好的吸附性能。最后，在微观结构分析，吸附动力学和等温结果的基础上提出了吸附机制，包括化学和物理吸附，并且发现化学吸附是在除去CO（II）的过程中的主要吸附机理。

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  • 来源
    《RSC Advances》 |2018年第24期|共18页
  • 作者

    Luo Wenqiang; Bai Zhishan; Zhu Yong;

  • 作者单位

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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