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聚乙烯亚胺/苎麻纤维自撑膜对铀酰离子的去除性能

张爽 唐勇 安再旭 陈茜茜 那兵 柳和生 柳玉辉

张爽, 唐勇, 安再旭, 等. 聚乙烯亚胺/苎麻纤维自撑膜对铀酰离子的去除性能[J]. 复合材料学报, 2024, 42(0): 1-9.
引用本文: 张爽, 唐勇, 安再旭, 等. 聚乙烯亚胺/苎麻纤维自撑膜对铀酰离子的去除性能[J]. 复合材料学报, 2024, 42(0): 1-9.
ZHANG Shuang, TANG Yong, AN Zaixu, et al. Research on the Uranium ion Removal Performance of Polyethyleneimine/Ramie Fiber Self-Supporting Membranes[J]. Acta Materiae Compositae Sinica.
Citation: ZHANG Shuang, TANG Yong, AN Zaixu, et al. Research on the Uranium ion Removal Performance of Polyethyleneimine/Ramie Fiber Self-Supporting Membranes[J]. Acta Materiae Compositae Sinica.

聚乙烯亚胺/苎麻纤维自撑膜对铀酰离子的去除性能

基金项目: 感谢国家基金委青年科学基金项目(22006013); 国家基金委地区科学基金项目(22266003);江西省主要学科学术和技术带头人青年人才项目(20225BCJ23020);中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金项目 (2023NRE-LH-18)
详细信息
    通讯作者:

    姓那兵,博士,教授,硕士生导师,研究方向为环境与能源高分子材料研究 E-mail:bna@ecut.edu.cn

    柳玉辉,博士,副教授,硕士生导师,研究方向为核化学与放射化学、核燃料循环与材料研究 E-mail:liuyuhui@ecut.edu.cn

  • 中图分类号: X703.1;TB332

Research on the Uranium ion Removal Performance of Polyethyleneimine/Ramie Fiber Self-Supporting Membranes

Funds: National Foundation Committee Youth Science Fund project (22006013) ; Regional science fund project of National Foundation Committee (22266003) ; Jiangxi Provincial Innovation and Entrepreneurship Training Program for College Students (20225BCJ23020) ; China Uranium Corporation Limited - East China University of Technology State Key Laboratory of Nuclear Resources and Environment Joint innovation fund project (2023NRE-LH-18)
  • 摘要: 为应对日益严重的能源和环境污染问题,含铀废水的处理已成为当务之急。为了高效便捷地处理含铀废水,通过低共熔溶剂(DES,氯化胆碱-草酸体系)处理苎麻纤维后接枝聚乙烯亚胺(PEI)制备聚乙烯亚胺/苎麻纤维自撑膜(PEI/RAM),并将其用于水溶液中铀酰离子(UO22+)的去除。研究了UO22+初始浓度、溶液pH值、吸附时间、温度等条件对吸附剂性能的影响。当铀酰离子初始浓度为20 mg/L、溶液pH为6时,铀酰离子吸附平衡容量达到302 mg·g−1;PEI/RAM的铀吸附过程更接近Langmuir模型和准二级动力学模型。在干扰金属离子(Ca2+、K+、Mg2+、Na+)存在时,聚乙烯亚胺/苎麻纤维自撑膜(PEI/RAM)吸附剂表现出对铀酰离子较好的选择性,对UO22+(20 mg/L)的吸附能力将近其他金属离子(20 mg/L)的70倍。

     

  • 图  1  聚乙烯亚胺/苎麻纤维自撑膜(PEI/RAM)流程示意图(a),接枝不同PEI浓度的SEM图像: 0% (b)、5% (c)、10% (d)、15% (e), 15% PEI/RAM的EDS图(f)、XRD图(g)、XPS全谱(h)、FTIR光谱(i)

    Figure  1.  Polythylenimide/Ramie fiber self-supporting film (PEI/RAM) process diagram (a); SEM visuals of ramie fibers incorporated with varying PEI concentrations: 0% (b), 5% (c), 10% (d), 15% (e), EDS spatial distribution for 15% PEI/RAM (f), XRD spectral analysis of PEI-infused ramie fibers (g), Comprehensive XPS survey spectra (h), FTIR spectral representations (i)

    图  2  PEI浓度图(a),pH与铀吸附容量的关系图(b)

    Figure  2.  PEI content (a), Relationship between pH and uranium adsorption capacity (b)

    图  3  PEI/RAM吸附等温线(a),Langmuir模型拟合结果图(b),Freundlich模型拟合结果图(c)

    Figure  3.  PEI/RAM Adsorption isotherm (a), Langmuir model (b), Freundlich isotherm (c)

    qe-Euilibrium adsorption capacity;Ce- Balance uranium ion concentration

    图  4  PEI/RAM吸附动力学(a)、准一级拟合(b)、和准二级拟合(c)

    Figure  4.  PEI/RAM Adsorption kinetics (a),Pseudo-first-order model and (b),Pseudo-second-order model (c)

    qt- Adsorption capacity at equilibrium at time t of adsorption

    图  5  PEI/RAM温度对吸附的影响图(a),lnKd与1/T的关系(b),解吸和再生循环图(c)

    Figure  5.  PEI/RAM Uranium uptake capacity versus temperature (a), Relationship between lnKd 1/T (b), desorption and regeneration cycles (c)

    图  6  PEI/RAM铀吸附后的EDS图(a)、吸附前后FTIR光谱图(b)、吸附后的XPS全谱图(c)和(d)

    Figure  6.  EDS mapping with PEI/RAM (a), FTIR spectra PEI/RAM (b), XPS survey spectra of ramie fibers grafted with PEI/RAM after uranium adsorption (c) and (d)

    图  7  UO22+和干扰金属离子的分布系数(a),有无金属离子对铀吸附能力的影响(b)

    Figure  7.  Distribution coefficient among uranyl and interfering metal ions (a), uranium uptake capacity with and without metal ions(b)

    表  1  Langmuir模型和Freundlich模型的拟合参数

    Table  1.   Fitting parameters of Langmuir model and Freundlich model.

    Material Langmuir isotherm Freundlich isotherm
    KL/(L·mg−1) qm /(mg·g−1) R2 N KF/(mg1−1/n·g−1·L−1/n ) R2
    Ramie fibers
    grafted with PEI
    7.966×10-2 613 0.9905 2.251 94.343 0.9747
    Notes: qm–Constants for adsorption capacity of Langmuir model; kL–Constants for affinity of Langmuir model; kF−Constant of Freundlich model; N−Favorability factor of the adsorption; R2−Fittingconstant
    下载: 导出CSV

    表  2  准一级模型和准二级模型的拟合参数

    Table  2.   Kinetic parameters of pseudo-first-order and pseudo-second-order models

    Material Pseudo-first-order model Pseudo-second-order model
    q1,cal/(mg·g−1) k1/(min−1) R2 q2,cal/(mg·g−1) k2/(mg·g−1·min−1) R2
    Ramie fibers
    grafted with PEI
    278.281 0.262 0.9827 347 9.78×10-3 0.9934
    Notes: qm–Constants for adsorption capacity of Langmuir model; kL–Constants for affinity of Langmuir model; kF−Constant of Freundlich model; N−Favorability factor of the adsorption; R2−Fittingconstant
    下载: 导出CSV
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  • 收稿日期:  2023-12-05
  • 修回日期:  2024-01-09
  • 录用日期:  2024-01-20
  • 网络出版日期:  2024-03-01

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