Hydrothermal Synthesis and Characterization of Ni-Al Montmorillonite-Like Phyllosilicates

Nanomaterials

Marc X. Reinholdt²  Jocelyne Brendlé³  Marie-Hélène Tuilier¹  Serge Kaliaguine⁴ 

[1] Université de Haute Alsace (UHA), Laboratoire Physique et Mécanique Textile (LPMT), EA 4365 (conventionnée au CNRS), F-68093 Mulhouse, France; E-Mail:;Université de Poitiers, CNRS UMR 7285 IC2MP, ENSIP-Bât. B1, 1 Rue Marcel Doré, F-86022 Poitiers cedex, France;Université de Haute Alsace (UHA), CNRS, Equipe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), LRC 7228, F-68093 Mulhouse, France; E-Mails:;Département de Génie Chimique, Université Laval, 1065 ave. de la Médecine, Québec, QC G1V 0A6, Canada; E-Mail:

关键词: clay;    montmorillonite;    synthesis;    fluoride medium;    solid-state NMR;    EXAFS;   

DOI  :  10.3390/nano3010048

来源: mdpi

【 摘 要 】

This work describes the first hydrothermal synthesis in fluoride medium of Ni-Al montmorillonite-like phyllosilicates, in which the only metallic elements in the octahedral sheet are Ni and Al. X-ray diffraction , chemical analysis, thermogravimetric and differential thermal analysis, scanning electron microscopy and transmission electron microscopy confirm that the synthesized samples are montmorillonite-like phyllosilicates having the expected chemical composition. The specific surface areas of the samples are relatively large (>100 m² g⁻¹) compared to naturally occurring montmorillonites. ²⁹Si and ²⁷Al nuclear magnetic resonance (NMR) indicate substitutions of Al for Si in the tetrahedral sheet. ¹⁹F NMR and Ni K-edge extended X-ray absorption fine structure (EXAFS) local probes highlight a clustering of the metal elements and of the vacancies in the octahedral sheet of the samples. These Ni-Al phyllosilicates exhibit a higher local order than in previously synthesized Zn-Al phyllosilicates. Unlike natural montmorillonites, where the distribution of transition metal cations ensures a charge equilibrium allowing a stability of the framework, synthetic montmorillonites entail clustering and instability of the lattice when the content of divalent element in the octahedral sheet exceeds ca. 20%. Synthesis of Ni-Al montmorillonite-like phyllosilicates, was successfully achieved for the first time. These new synthetic materials may find potential applications as catalysts or as materials with magnetic, optical or staining properties.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.