Structure and intercalation behavior of copper II on the layered sodium silicate magadiite material |
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Authors: | Adel Mokhtar Zohra Aouali Kebir Medjhouda Amal Djelad Abdelkader Boudia Abdelkader Bengueddach Mohamed Sassi |
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Affiliation: | 1.Laboratoire de Chimie des Matériaux, Département de Chimie, Faculté des Sciences Exactes et Appliquées,Université d’Oran1 “Ahmed Ben Bella”,Oran,Algeria |
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Abstract: | In this work, the ion-exchange reaction of the sodium silicate Na-magadiite with cupric ions was studied and the mode of interaction of the intercalated Cu2+ ions with silicate sheet was investigated. To do this, Na-magadiite was first synthesized using a hydrothermal method and characterized. It is then used to prepare Cu-exchanged magadiite materials with different copper contents by an ion-exchange reaction. The solids obtained were characterized by chemical and thermogravimetric analyses, powder X-ray diffraction, UV–Visible diffuse reflectance and Fourier transform spectroscopy, scanning electron microscopy and transmission electron microscopy. The results show that magadiite has a high affinity to copper ions and that the experimental exchange rate can be easily predicted. They show also that the intercalated Cu2+ ions are non-hydrated and are in direct interactions with the terminal interlayer ≡Si–O? groups, to which they are also probably strongly linked. Furthermore, the interlayer copper oxide species phase formed are in form of small particles homogeneously dispersed. Finally, the introduction of Cu2+ ions into the interlayer space does not substantially affect the structure of the Cu-exchanged materials but rather tends to stabilize it by increasing the decomposition temperature of the silanol groups . |
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