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首页> 外文期刊>RSC Advances >Characterization and adsorption properties of cross-linked yeast/beta-cyclodextrin polymers for Pb(ii) and Cd(ii) adsorption
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Characterization and adsorption properties of cross-linked yeast/beta-cyclodextrin polymers for Pb(ii) and Cd(ii) adsorption

机译：交联酵母/β-环糊精聚合物的表征及吸附性能，PB（II）和CD（II）吸附

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摘要

In this study, a crosslinked yeast/-cyclodextrin polymer (Y--CDP), for use as an effective adsorbent for removal Pb(ii) and Cd(ii) ions from aqueous solution, has been innovatively prepared by grafting -cyclodextrin (-CD) onto the surface of baker's yeast (BY) and thiomalic acid as a crosslinker. Several characterization techniques, such as SEM equipped with an EDS analyzer, FTIR, XRD, and XPS were employed characterize the Y--CDP. The impact of various operating parameters, such as pH, adsorbent dosage, initial concentration of metal ions, contact time and solution temperature, as well as adsorption kinetics, isotherms and thermodynamics were systematically investigated. The adsorption of Pb(ii) and Cd(ii) on Y--CDP reached equilibrium in 25 min, and the kinetic process conforms to the pseudo-second order model. The Langmuir model was used to describe the adsorption isotherm data better than the Freundlich model. The predicted maximum adsorption capacity at 25 degrees C for Pb(ii) and Cd(ii) was 150.08 and 102.80 mg g(-1), respectively, when the initial concentration of metal ions was 120 mg L-1. The thermodynamic analysis revealed that the adsorption procedure of Pb(ii) and Cd(ii) onto Y--CDP was spontaneous and endothermic. Furthermore, regeneration experiments demonstrated that Y--CDP had excellent recyclability. Together, all results suggested that Y--CDP could potentially be a promising adsorbent in the purification of water contaminated with heavy metal ions.
机译：在该研究中，通过嫁接-Cyclodextrin（ - - - - - CDP）（ - ）通过嫁接 - 环峰（ - - ）是由浇注 - 环峰（ - ）的有效吸附剂，用作从水溶液中的可生药和Cd（II）离子的有效吸附剂和CD（II）离子的有效吸附剂。（ - CD）在面包师酵母（逐）和硫代甲酸的表面上作为交联剂。采用了几种表征技术，例如使用EDS分析仪，FTIR，XRD和XPS的SEM表征Y - CDP。系统地研究了各种操作参数的影响，例如pH，吸附剂剂量，初始浓度，接触时间和溶液温度，以及吸附动力学，等温线和热力学。在y - CDP上的Pb（II）和Cd（II）的吸附在25分钟内达到平衡，并且动力学过程符合伪二阶模型。 Langmuir模型用于描述比Freundlich模型更好的吸附等温数据。当金属离子的初始浓度为120mg L-1时，Pb（II）和CD（II）的预测最大吸附容量分别为150.08和102.80mg g（-1）。热力学分析表明，在Y - CDP上的Pb（II）和Cd（II）的吸附过程是自发的和吸热的。此外，再生实验表明，Y - CDP具有优异的可回收性。在一起，所有结果表明Y - CDP可能是纯化污染重金属离子的水的有希望的吸附剂。

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  • 来源
    《RSC Advances》 |2018年第55期|共13页
  • 作者

    Duan Zhengyang; Song Mingyao; Li Tianguo; Liu Shuli; Xu Xiaojun; Qin Ronggao; He Changhua; Wang Yao; Xu Longqian; Zhang Mengjiao;

  • 作者单位

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Yunnan Agr Univ Coll Resources &

    Environm Kunming 650201 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Land Resource Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

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