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Nuclear wastewater decontamination by 3D-Printed hierarchical zeolite monoliths

机译：3D印刷等级沸石整料核废水净化

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摘要

The selective removal of radioactive cationic species, specifically Cs-137(+) and Sr-90(2+), from contaminated water is critical for nuclear waste remediation processes and environmental cleanup after accidents, such as the Fukushima Daiichi Nuclear Power Plant disaster in 2011. Nanoporous silicates, such as zeolites, are most commonly used for this process but in addition to acting as selective ion exchange media must also be deployable in a correct physical form for flow columns. Herein, Digital Light Processing (DLP) three-dimensional (3D) printing was utilized to form monoliths from zeolite ion exchange powders that are known to be good for nuclear wastewater treatment. The monoliths comprise 3D porous structures that will selectively remove radionuclides in an engineered form that can be tailored to various sizes and shapes as required for any column system and can even be made with fine-grained powders unsuitable for normal gravity flow column use. 3D-printed monoliths of zeolites chabazite and 4A were made, characterized, and evaluated for their ion exchange capacities for cesium and strontium under static conditions. The 3D-printed monoliths with 50 wt% zeolite loadings exhibit Cs and Sr uptake with an equivalent ion-capacity as their pristine powders. These monoliths retain their porosity, shape and mechanical integrity in aqueous media, providing a great potential for use to not only remove radionuclides from nuclear wastewater, but more widely in other aqueous separation-based applications and processes.
机译：来自受污染的水的放射性阳离子物种，特别是CS-137（+）和SR-90（2+）的选择性去除对于核废料修复过程和事故后环境清理，如福岛Daiichi核电站灾难，这是至关重要的2011.纳米孔硅酸盐，例如沸石，最常用于该过程，但除了用作选择性离子交换介质，还必须以正确的物理形式展开流动柱。这里，利用数字光处理（DLP）三维（3D）印刷来形成来自已知核废水处理的沸石离子交换粉末的沸石离子交换粉末。整体含量包括3D多孔结构，其将以各种尺寸系统所需的设计形式选择性地除去可用于各种尺寸和形状的辐射核素，甚至可以用不适合常规重力流动柱使用的细粒粉末制成。制备3D印刷的沸石曲斑沸石和4A的沸石，其特征，并在静态条件下对铯和锶的离子交换能力评价。具有50wt％沸石载体的3D印刷的整料载体表现出Cs和Sr摄取，其具有相当于离子容量作为其原始粉末。这些整体在水性介质中保留了它们的孔隙率，形状和机械完整性，提供了巨大的用途，不仅可以去除来自核废水的放射性核素，而且在其它水性分离的应用和方法中更广泛地使用。

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  • 来源
    《RSC Advances》 |2020年第10期|共11页
  • 作者

    Halevi Oded; Chen Tzu-Yu; Lee Pooi See; Magdassi Shlomo; Hriljac Joseph A.;

  • 作者单位

    CREATE NTU HUJ Programme Enterprise Wing Singapore 138602 Singapore;

    Univ Birmingham Sch Chem Birmingham B15 2TT W Midlands England;

    CREATE NTU HUJ Programme Enterprise Wing Singapore 138602 Singapore;

    CREATE NTU HUJ Programme Enterprise Wing Singapore 138602 Singapore;

    Univ Birmingham Sch Chem Birmingham B15 2TT W Midlands England;

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  • 正文语种 eng
  • 中图分类 化学;
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