A bifunctional robust metal sulfide with highly selective capture of Pb2+ ions and luminescence sensing ability for heavy metals in aqueous media,Inorganic Chemistry Frontiers

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A bifunctional robust metal sulfide with highly selective capture of Pb2+ ions and luminescence sensing ability for heavy metals in aqueous media
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-07-29 , DOI: 10.1039/d1qi00666e
Anastasia D. Pournara ₁ , Christina-Georgia Bika ₁ , Xitong Chen ₂ , Theodore Lazarides ₃ , Spyridon Kaziannis ₄ , Pingyun Feng ₂ , Manolis J. Manos _{1,

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Affiliation

Heavy metal ions represent hazardous and harmful contaminants for living organisms and the environment and thus, it is of urgent need to develop new materials sufficient to detect and remove them efficiently. Herein, we report the metal sulfide ion exchanger (MSIE) H_xGa_xGe_4−xS₈·yH₂O (protonated UCR-20, p-UCR-20) which demonstrates exceptional capability for both detection and removal of heavy metals from aqueous samples. This material exhibited exceptional fast sorption kinetics (≤1 min), high sorption capacity (∼527 mg g⁻¹) and remarkable selectivity for Pb²⁺ towards various common alkali and alkaline earth cations and in highly acidic to alkaline conditions. Even more importantly, p-UCR-20 in its composite form with calcium alginate was used as stationary phase (along with silica sand) in a fixed-bed ion exchange column and was found capable of eliminating traces of Pb²⁺ from a large volume of a wastewater simulant solution. Photophysical studies revealed that p-UCR-20 shows excellent luminescence sensing properties for Pb²⁺, achieving limits of detection below the acceptable Pb levels in water and such efficient sensing properties are largely retained even in the presence of several antagonistic species in large excess. In addition, p-UCR-20 displays highly efficient sensing properties for additional heavy metal ions, such as Ni²⁺ and Cd²⁺. Overall, the results derived from the current study reveal for the first time that MSIES may be a source not only of excellent sorbents but also exceptional luminescent sensors for heavy metal ions in aqueous media.

中文翻译：

具有高选择性捕获 Pb2+ 离子和对水性介质中重金属的发光传感能力的双功能稳健金属硫化物

重金属离子对生物体和环境来说是危险和有害的污染物，因此迫切需要开发足以有效检测和去除它们的新材料。在此，我们报告了金属硫化物离子交换剂 (MSIE) H _x Ga _x Ge _{4− x} S ₈ · y H ₂ O（质子化 UCR-20，p-UCR-20），它在检测和去除重离子方面表现出卓越的能力。水样中的金属。该材料表现出优异的快速吸附动力学（≤1 分钟）、高吸附容量（~527 mg g ^-1）和显着的 Pb ²⁺选择性对各种常见的碱金属和碱土金属阳离子以及在高酸性至碱性条件下。更重要的是，p-UCR-20与海藻酸钙的复合形式被用作固定床离子交换柱中的固定相（与硅砂一起），并发现能够从大体积中去除痕量 Pb ²⁺废水模拟溶液。光物理研究表明，p-UCR-20对 Pb ²⁺显示出出色的发光传感特性，实现了低于水中可接受的 Pb 水平的检测限，并且即使在存在大量过量的几种拮抗物质的情况下，这种有效的传感特性也在很大程度上得以保留。此外，p-UCR-20对额外的重金属离子（如 Ni ²⁺和 Cd ^{2+ ）}显示出高效的传感特性。总体而言，从当前研究得出的结果首次表明，MSIES 可能不仅是优良吸附剂的来源，而且是水性介质中重金属离子的特殊发光传感器的来源。

更新日期：2021-08-04

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