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A highly efficient supramolecular adsorbent for precious metal: adsorption behavior of PdII by melamine cyanurate

机译：一种高效的贵金属超分子吸附剂：三聚氰胺氰尿酸盐的PDII吸附行为

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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 g _(Pd) 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 π–π 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：发现三聚氰胺氰脲酸酯（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。通过M-Ca的PD〜（II）的吸附在前30分钟内快速，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。通过Langmuir等温模型对M-CA的PD〜（II）的吸附很好，最大吸附容量为0.874g _（pd）g _（m-ca）〜（α1）。 M-Ca还能够从含有其他金属的溶液中选择性吸附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π-π堆叠的分层复合物。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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