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Structure and intercalation behavior of copper II on the layered sodium silicate magadiite material

Adel Mokhtar, Zohra Aouali Kebir Medjhouda, Amal Djelad, Abdelkader Boudia, Abdelkader Bengueddach, and Mohamed Sassi

Université d’Oran1 “Ahmed Ben Bella”, Oran, Algeria

 

E-mail: mokhtar.adel@edu.univ-oran1.dz

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 .

Keywords: Ion exchange ; Copper ; Magadiite ; Layered silicate ; Structure 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-017-0255-z

 

Chemical Papers 72 (1) 39–50 (2018)

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