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首页> 外文期刊>Environmental Science & Technology >Effective Removal of Anionic Re(Ⅷ) by Surface-Modified Ti_2CT_x MXene Nanocomposites: Implications for Tc(Ⅷ) Sequestration
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Effective Removal of Anionic Re(Ⅷ) by Surface-Modified Ti_2CT_x MXene Nanocomposites: Implications for Tc(Ⅷ) Sequestration

机译：表面改性的Ti_2CT_x MXene纳米复合材料有效去除阴离子Re（Ⅷ）：Tc（Ⅷ）螯合的意义

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摘要

Environmental contamination by Tc-99(VII) from radioactive wastewater streams is of particular concern due to the long half-life of Tc-99 and high mobility of pertechnetate. Herein, we report a novel MXene-polyelectrolyte nanocomposite with three-dimensional networks for enhanced removal of perrhenate, which is pertechnetate simulant. The introduction of poly(diallyldimethylammonium chloride) (PDDA) regulates the surface charge and improves the stability of Ti2CTx, nanosheet, resulting in Re(VII) removal capacity of up to 363 mg g(-1), and fast sorption kinetics. The Ti2CTx/PDDA nanocomposite furthermore exhibits good selectivity for ReO4- when competing anions (such as Cl- and SO42- coexist at a concentration of 1800 times. The immobilization mechanism was confirmed as a sorption-reduction process by batch sorption experiments and X-ray photoelectron spectroscopy. The pH-dependent reducing activity of Ti2CTx/PDDA nanocomposite toward Re(VII) was clarified by X-ray absorption spectroscopy. As the pH increases, the local environment gradually changes from octahedral coordinated Re(IV) to tetrahedral-coordinated Re(VII). The overall results suggest that Ti2CTx/PDDA nanocomposite may be a promising candidate for efficient elimination of Tc contamination. The reported surface modification strategy might result in applications of MXene-based materials in environmental remediation of other oxidized anion pollutants.
机译：由于Tc-99的半衰期长和高tech酸盐的高迁移率，Tc-99（VII）对放射性废水的环境污染尤为令人关注。在本文中，我们报告了一种新型的MXene-聚电解质纳米复合材料，该复合材料具有三维网络，可增强高tech酸盐的去除效果，而高r酸盐是高tech酸盐的模拟物。引入聚二烯丙基二甲基氯化铵（PDDA）调节表面电荷并提高Ti2CTx纳米片的稳定性，从而使Re（VII）的去除量高达363 mg g（-1），并具有快速的吸附动力学。 Ti2CTx / PDDA纳米复合材料在竞争性阴离子（如Cl-和SO42-共存1800次）时对ReO4-表现出良好的选择性，通过分批吸附实验和X射线证实了固定化机理是一种吸附-还原过程。 X射线吸收光谱法证实了Ti2CTx / PDDA纳米复合材料对Re（VII）的pH依赖性还原活性，随着pH值的升高，局部环境逐渐由八面体配位的Re（IV）变为四面体配位的Re （VII）。总体结果表明，Ti2CTx / PDDA纳米复合材料可能是有效消除Tc污染的有前途的候选者，据报道的表面改性策略可能会导致基于MXene的材料在环境修复其他氧化阴离子污染物中的应用。

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  • 来源
    《Environmental Science & Technology》 |2019年第7期|3739-3747|共9页
  • 作者

    Wang Lin; Song Huan; Yuan Liyong; Li Zijie; Zhang Peng; Gibson John K.; Zheng Lirong; Wang Hongqing; Chai Zhifang; Shi Weiqun;

  • 作者单位

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China|Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China|Univ South China, Hunan Key Lab Design & Applicat Actinide Complexe, Hengyang 421001, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China;

    LBNL, Chem Sci Div, Berkeley, CA 94720 USA;

    Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China;

    Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China|Univ South China, Hunan Key Lab Design & Applicat Actinide Complexe, Hengyang 421001, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China|Chinese Acad Sci, Ningbo Inst Ind Technol, Engn Lab Adv Energy Mat, Ningbo 315201, Zhejiang, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China|Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing 100049, Peoples R China;

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