Marchesi Stefano, Nascimbene Simone, Guidotti Matteo, Bisio Chiara, Carniato Fabio
Dipartimento di Scienze e Innovazione Tecnologica, Università degli Studi del Piemonte Orientale "Amedeo Avogadro", Viale Teresa Michel 11, 15121-Alessandria, Italy.
CNR-SCITEC Istituto di Scienze e Tecnologie Chimiche "G. Natta", Via C. Golgi 19, 20133-Milan, Italy.
Dalton Trans. 2022 Mar 15;51(11):4502-4509. doi: 10.1039/d1dt04344g.
The removal of paramagnetic metal ions with different charges and ionic radii ( Gd, Cu, and Co) from aqueous solutions was carried out by using a Na-exchanged synthetic saponite clay. Saponite, composed of sub-micrometer particles and characterized by high cation-exchange capacity, was prepared through a classical low-cost hydrothermal approach. The metal ion uptake tests were performed in water at pH = 5.5 and 3.0, and the capture process was monitored in real time by H-NMR relaxometry. The experimental data were confirmed by the conventional ICP-OES technique. Details of the uptake process kinetics were extrapolated from the NMR analyses as well. Saponite showed good sorption capacity for all selected metal ions. The regeneration of the solid sorbent after metal uptake was also analysed, obtaining encouraging results.
通过使用钠交换合成皂石粘土，从水溶液中去除具有不同电荷和离子半径的顺磁性金属离子（钆、铜和钴）。皂石由亚微米颗粒组成，具有高阳离子交换容量的特征，通过经典的低成本水热法制备。在pH = 5.5和3.0的水中进行金属离子吸收测试，并通过H-NMR弛豫法实时监测捕获过程。实验数据也通过传统的ICP-OES技术得到证实。吸收过程动力学的详细信息也从NMR分析中推断得出。皂石对所有选定的金属离子都表现出良好的吸附能力。还分析了金属吸收后固体吸附剂的再生情况，获得了令人鼓舞的结果。
