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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Efficient and irreversible capture of strontium ions from aqueous solution using metal-organic frameworks with ion trapping groups
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Efficient and irreversible capture of strontium ions from aqueous solution using metal-organic frameworks with ion trapping groups

机译：使用金属 - 有机骨架与离子捕获组的水溶液中锶离子的高效捕获

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摘要

Efficient and irreversible capture of radioactive nuclides is an important environmental protection task when disposing of nuclear wastewater. This paper uses an "ion trapping" concept to design an efficient adsorbent based on a metal-organic framework (MOF), for removal of radioactive strontium from nuclear wastewater. Two functionalized MOFs were achieved by the introduction of sulfate or oxalate into the pore structure of MOF-808, giving MOF-808-SO4 and MOF-808-C2O4, respectively. These functionalized MOF-808 materials exhibit excellent ability to remove Sr2+ from acidic solution due to their particular trapping action, with the maximum Sr2+ adsorption capacities of 176.56 mg g(-1) and 206.34 mg g(-1) for MOF-808-SO4 and MOF-808-C2O4, respectively, surpassing most other inorganic materials. Additionally, 99% of Sr2+ is removed by MOF-808-SO4 and MOF-808-C2O4 after reaching the equilibrium. Remarkably, these two functionalized MOF-808 materials exhibited selectivity for the removal of Sr2+ from simulated mixed nuclear wastewater, even when there are 10 times as many co-existing ions as Sr2+ ions, demonstrating that anchoring of the trapping groups is a good way to improve Sr2+ adsorption capacity on MOFs. Moreover, both functionalized MOF-808 materials trap Sr2+ ions irreversibly, suggesting these trapping groups have strong ability to bind with Sr2+. A mechanism study indicated no proton ion exchange occurred during the adsorption process, so the functionalized groups anchored to MOFs play an important role in Sr2+ adsorption. Our present study provides an efficient way to design new adsorbents for the removal of radioactive strontium and other radionuclides from nuclear wastewater.
机译：放射性核素的高效和不可逆捕获是处理核废水时的重要环保任务。本文采用“离子捕获”概念来设计基于金属有机框架（MOF）的有效吸附剂，用于从核废水中去除放射性锶。通过将硫酸盐或草酸盐引入MOF-808的孔结构来实现两个官能化的MOF，分别给予MOF-808-SO4和MOF-808-C2O4。这些官能化的MOF-808材料表现出优异的能力，由于其特定的捕获作用，从酸性溶液中除去Sr2 +，最大SR2 +吸附容量为176.56mg（-1）和206.34mg g（-1），用于MOF-808-SO4和MOF-808-C2O4分别超过大多数其他无机材料。另外，在达到平衡后，通过MOF-808-SO4和MOF-808-C2O4除去99％的SR2 +。值得注意的是，这两个官能化的MOF-808材料表现出从模拟的混合核废水中去除SR2 +的选择性，即使存在10倍的共存离子作为SR2 +离子的次数，表明捕获组的锚定是一种好方法提高MOF上的SR2 +吸附容量。此外，官能化的MOF-808材料捕获SR2 +离子不可逆转，表明这些捕获基团具有与SR2 +结合的强能力。机制研究表明了在吸附过程中没有发生质子离子交换，因此锚定的官能化基团在SR2 +吸附中起重要作用。我们现在的研究提供了设计新吸附剂，用于从核废水中去除放射性锶和其他放射性核素的新吸附剂。

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    Mu Wanjun; Du Shenzhen; Li Xingliang; Yu Qianhong; Hu Rui; Wei Hongyuan; Yang Yuchuan; Peng Shuming;

  • 作者单位

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem 64 Mianshan Rd Mianyang 621900 Sichuan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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