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钾改性蒙脱石磁性微球对铯的吸附性能

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杜明阳, 邹京, 豆俊峰, 仉铭坤, 夏梦. 钾改性蒙脱石磁性微球对铯的吸附性能[J]. 环境化学, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
引用本文: 杜明阳, 邹京, 豆俊峰, 仉铭坤, 夏梦. 钾改性蒙脱石磁性微球对铯的吸附性能[J]. 环境化学, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
shu
DU Mingyang, ZOU Jing, DOU Junfeng, ZHANG Mingkun, XIA Meng. Adsorption properties of potassium modified montmorillonite magnetic microspheres for cesium[J]. Environmental Chemistry, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
Citation: DU Mingyang, ZOU Jing, DOU Junfeng, ZHANG Mingkun, XIA Meng. Adsorption properties of potassium modified montmorillonite magnetic microspheres for cesium[J]. Environmental Chemistry, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
shu

钾改性蒙脱石磁性微球对铯的吸附性能

  • 北京师范大学水科学研究院, 城市水循环与海绵城市技术北京市重点实验室, 北京, 100875

    • 通讯作者: 豆俊峰, E-mail: doujf@bnu.edu.cn ; 
  • 基金项目:

    国家自然科学基金（51878051）资助.

Adsorption properties of potassium modified montmorillonite magnetic microspheres for cesium

  • Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing, 100875, China

    • Corresponding author: DOU Junfeng, doujf@bnu.edu.cn ; 
  • Fund Project: Supported by National Natural Science Foundation of China (51878051).

  • 摘要: 本研究以钙基蒙脱石（Ca-MMT）为原料，通过K+作用制得改性蒙脱石粉（K-MMT），经海藻酸钠交联作用，将改性蒙脱石与永磁体（BaFe12O19）结合，制成钾改性蒙脱石磁性微球（KMBC）.对比了Ca-MMT、K-MMT、KMBC对Cs+的吸附差异，并通过SEM-EDS、FTIR、XRD、XPS分析了K-MMT的微观结构及理化性质.试验结果表明，K+对蒙脱石的改性以离子交换为主，改性后晶体层间距变小，吸附量K-MMT>KMBC>Ca-MMT，分别为57.08、45.13、45.05 mg·g-1；K-MMT对Cs+的吸附属于吸热反应，反应在2 h内可达到平衡，35℃时KMBC的最大吸附量为136.08 mg·g-1；随着pH的增加，KMBC对Cs+的吸附量呈先增大后减小的趋势；吸附机理主要包括离子交换和内层扩散.
    Abstract: In this study, calcium-based montmorillonite (Ca-MMT) was modified by K+ to produce potassium-modified montmorillonite (K-MMT). Through the cross-linking of sodium alginate, the modified montmorillonite was further combined with permanent magnet (BaFe12O19) to form potassium-modified montmorillonite magnetic microspheres (KMBC). The adsorption behaviors of Ca-MMT, K-MMT and KMBC on Cs+ were compared while the associated microstructure and physicochemical properties were characterized by SEM-EDS, FTIR, XRD and XPS analysis. The results showed that the modification of montmorillonite by K+ was mainly achieved by ion exchange and it reduced the spacing of crystal layer. The adsorption capacity followed the order of K-MMT>KMBC>Ca-MMT, which was 57.08, 45.13, and 45.05 mg·g-1, respectively. The adsorption of Cs+ by K-MMT was an endothermic reaction, which reached equilibrium within 2 hours. The maximum Cs+ adsorption capacity of KMBC was 136.08 mg·g-1 at 35℃. With inceasing pH, the adsorption capacity of Cs+ by KMBC went up first and then decreased. The adsorption mechanism mainly included ion exchange and inner layer diffusion.
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  • 收稿日期:  2019-11-02
杜明阳, 邹京, 豆俊峰, 仉铭坤, 夏梦. 钾改性蒙脱石磁性微球对铯的吸附性能[J]. 环境化学, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
引用本文: 杜明阳, 邹京, 豆俊峰, 仉铭坤, 夏梦. 钾改性蒙脱石磁性微球对铯的吸附性能[J]. 环境化学, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
shu
DU Mingyang, ZOU Jing, DOU Junfeng, ZHANG Mingkun, XIA Meng. Adsorption properties of potassium modified montmorillonite magnetic microspheres for cesium[J]. Environmental Chemistry, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
Citation: DU Mingyang, ZOU Jing, DOU Junfeng, ZHANG Mingkun, XIA Meng. Adsorption properties of potassium modified montmorillonite magnetic microspheres for cesium[J]. Environmental Chemistry, 2021, (3): 779-789. doi: 10.7524/j.issn.0254-6108.2019110202
shu

钾改性蒙脱石磁性微球对铯的吸附性能

    通讯作者: 豆俊峰, E-mail: doujf@bnu.edu.cn ; 
  • 北京师范大学水科学研究院, 城市水循环与海绵城市技术北京市重点实验室, 北京, 100875
  • 收稿日期:  2019-11-02
基金项目:

国家自然科学基金（51878051）资助.

摘要: 本研究以钙基蒙脱石（Ca-MMT）为原料，通过K+作用制得改性蒙脱石粉（K-MMT），经海藻酸钠交联作用，将改性蒙脱石与永磁体（BaFe12O19）结合，制成钾改性蒙脱石磁性微球（KMBC）.对比了Ca-MMT、K-MMT、KMBC对Cs+的吸附差异，并通过SEM-EDS、FTIR、XRD、XPS分析了K-MMT的微观结构及理化性质.试验结果表明，K+对蒙脱石的改性以离子交换为主，改性后晶体层间距变小，吸附量K-MMT>KMBC>Ca-MMT，分别为57.08、45.13、45.05 mg·g-1；K-MMT对Cs+的吸附属于吸热反应，反应在2 h内可达到平衡，35℃时KMBC的最大吸附量为136.08 mg·g-1；随着pH的增加，KMBC对Cs+的吸附量呈先增大后减小的趋势；吸附机理主要包括离子交换和内层扩散.

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