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Magnetic modification of used tea leaves for uranium adsorption

YANG Ai-li YANG Sheng-ya ZHU Yu-kuan

杨爱丽, 杨胜亚, 朱玉宽. 废茶渣磁性改性物的制备及其去铀性能[J]. 新型炭材料, 2021, 36(4): 821-826. doi: 10.1016/S1872-5805(21)60053-7
引用本文: 杨爱丽, 杨胜亚, 朱玉宽. 废茶渣磁性改性物的制备及其去铀性能[J]. 新型炭材料, 2021, 36(4): 821-826. doi: 10.1016/S1872-5805(21)60053-7
YANG Ai-li, YANG Sheng-ya, ZHU Yu-kuan. Magnetic modification of used tea leaves for uranium adsorption[J]. NEW CARBON MATERIALS, 2021, 36(4): 821-826. doi: 10.1016/S1872-5805(21)60053-7
Citation: YANG Ai-li, YANG Sheng-ya, ZHU Yu-kuan. Magnetic modification of used tea leaves for uranium adsorption[J]. NEW CARBON MATERIALS, 2021, 36(4): 821-826. doi: 10.1016/S1872-5805(21)60053-7

废茶渣磁性改性物的制备及其去铀性能

doi: 10.1016/S1872-5805(21)60053-7
基金项目: 国家自然科学基金项目(No. 21407132);中国工程物理研究院环保基金项目(No. YAHZY-2018-008)
详细信息
    通讯作者:

    杨爱丽,博士,副研究员. E-mail: yang770117@sina.com

  • 中图分类号: TQ127.1+1

Magnetic modification of used tea leaves for uranium adsorption

Funds: National Natural Science Foundation of China (21407132) and Environmental Protection Foundation of China Academy of Engineering Physics (YAHZY-2018-008)
More Information
  • 摘要: 将改进Hummers法合成的氧化石墨烯(GO)与废茶渣(TW)、Fe3O4进行复合获得废茶渣磁性改性物rGO/Fe3O4/TW,通过FTIR光谱和XRD对产物结构和晶型进行表征。考察溶液pH 值、振荡时间和铀初始浓度对合成产物吸附行为的影响。采用孔结构分析仪和XPS对rGO/Fe3O4/TW吸附前后样品的孔特性和表面结构进行吸附机理分析。结果表明,rGO/Fe3O4/TW不仅具有优良的去铀性能,短时间内可达近100%的去除率,而且负载铀之后通过磁场作用易从液相中快速分离出来。rGO/Fe3O4/TW对铀的吸附过程符合Langmuir 模型和准二级动力学模型。对于初始浓度为10 mg/L的含铀溶液,TW、MTW和rGO/Fe3O4/TW的最大吸附量分别为97.70 mg g−1、79.46 mg g−1和103.84 mg g−1。同时,rGO/Fe3O4/TW具有良好的循环再利用性,经5个吸附-解吸-再吸附循环之后,仍可达到较好的去铀效果,去铀率约为85%。
  • FIG. 786.  FIG. 786.

    FIG. 786.. 

    Figure  1.  (a) FTIR spectra and (b) XRD pattern of TW, MTW, Fe3O4 and rGO/Fe3O4/TW.

    Figure  2.  Influence of pH value on the adsorption efficiencies of TW, MTW and rGO/Fe3O4/TW. (Cinitial U=10 mg L−1, sorbent dose of m/V=0.5 g L−1, shaking time=30 min).

    Figure  3.  (a) Influence of adsorption time on uranium removal rate on TW, MTW and rGO/Fe3O4/TW and (b) adsorption kinetics model fit of U(VI) adsorption on TW, MTW and rGO/Fe3O4/TW. (Cinitial U=10 mg L−1, pH=6.0, the sorbent dose of m/V=0.5 g L−1).

    Figure  4.  Langmuir and Freundlich models fit of U(VI) adsorption on TW, MTW and rGO/Fe3O4/TW (Cinitial U=10 mg L−1, pH=6.0, the sorbent dose of m/V=0.5 g L−1, shaking time=24 h).

    Figure  5.  Reusability for U(VI) adsorption on rGO/Fe3O4/TW over 5 cycles.

    Table  1.   Adsorption kinetic model parameters for TW, MTW and rGO/Fe3O4/TW.

    SorbentsPseudo-first-order model Pseudo-second-order model
    Qe
    (mg/g)
    k1 (g/(mg·
    min)
    R2Qe (mg/g)k2 (g/(mg·
    min)
    R2
    TW0.57560.0260.936119.920.2330.9999
    MTW0.12980.0180.967712.350.0060.9945
    rGO/Fe3O4/TW0.20750.0350.973020.410.0270.9993
    下载: 导出CSV

    Table  2.   Adsorption parameters for langmuir and freundlich isotherm models.

    SorbentsLangmuir isotherm Freundlich isotherm
    Qm
    (mg g−1)
    kL
    (L mg−1)
    R2nkF (mg1−n Ln g−1)R2
    TW97.700.110.98992.4216.860.9885
    MTW79.460.140.99693.4221.520.8937
    rGO/Fe3O4/TW103.840.750.99834.0540.270.8749
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-07
  • 修回日期:  2020-02-03
  • 网络出版日期:  2021-04-15
  • 刊出日期:  2021-07-30

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