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首页> 外文期刊>RSC Advances >High iodine adsorption performances under off-gas conditions by bismuth-modified ZnAl-LDH layered double hydroxide
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High iodine adsorption performances under off-gas conditions by bismuth-modified ZnAl-LDH layered double hydroxide

机译：通过铋改性的ZNAL-LDH层叠双氢氧化物在废气条件下的高碘吸附性能

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摘要

The effective adsorption of radioactive iodine is greatly desirable, but is still a significant challenge. In this manuscript, we report the synthesis of a bismuth-modified zinc aluminium layered double hydroxide (BiZnAl-LDH) via a co-precipitation method for the highly efficient absorption of iodine. Based on the robust chemical attraction between Bi and I-2, BiZnAl-LDH exhibited highly effective iodine capture. Furthermore, to evaluate BiZnAl-LDH as an effective sorbent, it was characterized via X-ray powder diffraction (XRD), scanning electron microscopy-energy dispersion spectroscopy (SEM-EDS), and Fourier-transform infrared spectroscopy (FITR). In addition, to determine the morphology and iodine adsorption properties of BiZnAl-LDH, several studies were conducted. Through experiments, its elemental composition and vibration before and after iodine adsorption were analyzed via EDS and X-ray photoelectron spectroscopy (XPS). During the capture process, I-2 is reduced to I- by the intercalated Bi(3+)via chemical adsorption, and the maximum adsorption capacity of BiZnAl-LDH for iodine reached up to 433 mg g(-1), which had a surface area, average pore diameter, and pore volume of 36.259 m(2) g(-1), 2.374 nm, and 0.128 m(3) g(-1), respectively. Compared with several previous sorbents for iodine adsorption, BiZnAl-LDH exhibited an iodine adsorption of approximately two times that of the commercial Ag-exchange zeolite X, and furthermore BiZnAl-LDH is cost-effective. Thus, the substantial iodine capture by BiZnAl-LDH indicates that it is a capable sorbent for the effective elimination of radioactive iodine from reprocessing plant emissions.
机译：放射性碘的有效吸附是非常理想的，但仍然是一个重大挑战。在该稿件中，我们通过共沉淀法向高效吸收碘的共析出方法报告了铋改性锌层叠双氢氧化物（Biznal-LDH）的合成。基于BI和I-2之间的鲁棒化学吸引力，Biznal-LDH表现出高效的碘捕获。此外，为了评估Biznal-LDH作为有效的吸附剂，它通过X射线粉末衍射（XRD），扫描电子显微镜 - 能量分散谱（SEM-ads）和傅立叶变换红外光谱（FITR）表征。此外，为了确定Biznal-LDH的形态和碘吸附性质，进行了几项研究。通过实验，通过EDS和X射线光电子能谱（XPS）分析其碘吸附之前和碘的元素组成和振动。在捕获过程中，通过化学吸附通过插入的Bi（3+）减少到I- I-2，并且碘的Biznal-LDH的最大吸附能力达到433mg g（-1），其中有一个表面积，平均孔径和孔体积为36.259μm（2）g（-1），2.374nm和0.128m（3）g（3）g（-1）。与碘吸附的几种嗜酸剂相比，Biznal -LDH表现出碘吸附的碘对商业Ag-Exchange沸石X的两倍，此外Biznal-LDH具有成本效益。因此，Biznal-LDH的实质碘捕获表明它是一种能够有效地消除从再加工植物排放的放射性碘的吸附剂。

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  • 来源
    《RSC Advances》 |2020年第24期|共8页
  • 作者

    Trinh Dinh Dinh; Zhang Dongxiang; Vu Ngoc Tuan;

  • 作者单位

    Beijing Inst Technol Sch Chem &

    Chem Engn Beijing 102488 Peoples R China;

    Beijing Inst Technol Sch Chem &

    Chem Engn Beijing 102488 Peoples R China;

    Nam Dinh Univ Technol Educ Fac Elect Elect Engn Nam Dinh 420000 Vietnam;

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  • 正文语种 eng
  • 中图分类 化学;
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