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A highly efficient supramolecular adsorbent for precious metal: adsorption behavior of Pd-II by melamine cyanurate

机译：一种高效的贵金属超分子吸附剂：三聚氰胺氰尿酸酯的PD-II吸附行为

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摘要

Melamine cyanurate (M-CA) was found to be a highly recoverable and selective supramolecular adsorbent for recovery of Pd-II ion. Adsorption of Pd-II by M-CA was fast in the first 30 min, with 93% adsorption efficiency, and equilibrium was reached within 1 h. Langmuir and Freundlich isotherm models were employed to correlate the experimental data. The adsorption of Pd-II by M-CA is well supported by a Langmuir isotherm model, with a high maximum adsorption capacity of 0.874 gPd g(M-CA)(-1). M-CA was also capable of selective adsorption of Pd-II from a solution containing other metals. Pd adsorbed on M-CA was separated quantitatively by reductive treatment, and the M-CA could be recycled at least 3 times. We propose an in-plane adsorption mechanism for M-CA, which is a pi-pi stacked layered complex, based on the results of X-ray spectroscopy and computational calculations. This study demonstrates that M-CA is promising as a selective and highly efficient adsorbent for recovery of precious metals.
机译：发现三聚氰胺氰尿酸酯（M-CA）是一种高度可回收和选择性的超分子吸附剂，用于回收PD-II离子。在前30分钟内通过M-Ca吸附PD-II，吸附效率为93％，在1小时内达到平衡。 Langmuir和Freundlich等温模型被用来关联实验数据。 PD-II通过M-CA的吸附是由Langmuir等温模型的很好的支持，最大吸附容量为0.874gpd g（m-ca）（ - 1）。 M-CA还能够从含有其他金属的溶液中选择性地吸附PD-II。通过还原处理定量地分离吸附在M-Ca上的Pd，M-Ca可以再循环至少3次。我们提出了一种基于X射线光谱和计算计算的结果的M-CA的平面内吸附机制，其是PI-PI堆叠层状复合物。该研究表明，M-CA是对储存贵金属的选择性和高效吸附剂。

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  • 来源
    《RSC Advances》 |2016年第105期|共7页
  • 作者

    Nagai D.; Kimoto T.;

  • 作者单位

    Gunma Univ Fac Sci &

    Technol Div Mol Sci 1-5-1 Tenjin Cho Kiryu Gunma 3768515 Japan;

    Gunma Univ Fac Sci &

    Technol Div Mol Sci 1-5-1 Tenjin Cho Kiryu Gunma 3768515 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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