Synthesis and characterization of layered double hydroxides with different cations (Mg, Co, Ni, Al), decomposition and reformation of mixed metal oxides to layered structures

• Authors: Kristina Klemkaite , Igoris Prosycevas , Ricardas Taraskevicius , Alexander Khinsky , Aivaras Kareiva
• Languages of publication: EN

Abstracts

EN

Three layered double hydroxides (LDH) [Mg1−xAlx(OH)2]x+(Am−)x/m]·nH2O and [MII
1−xMIII
x (OH)2]x+(Am−)x/m]·nH2O (MII - Mg, Co, Ni; MIII - Al; A - CO3
2−) were successfully synthesized by the low supersaturation method. The as-synthesized LDH samples were thermally decomposed and the derived mixed metal oxides reformed back to layered structures in water and magnesium nitrate media at different temperatures. All synthesized samples were characterized by X-ray diffraction (XRD) analysis, thermogravimetric (TG) analysis, X-ray fluorescence (XRF) analysis and scanning electron microscopy (SEM). The results of XRD and XRF analyses showed that single-phase layered double hydroxides were formed during synthesis and reformation. It was demonstrated, that a partially substituted by cobalt and nickel LDH samples also show memory effect. The crystallite size of regenerated LDH depends on the regeneration media, temperature and chemical composition. The LDH samples after regeneration consist of large particles with sharp edges along with a large amount of smaller particles

Keywords

EN

Layered double hydroxides; Chemical synthesis; Hydration; Regeneration; Memory effect

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 2
• Pages: 275-282

Dates

published

1 - 4 - 2011

online

17 - 2 - 2011

Contributors

author

Kristina Klemkaite

author

Igoris Prosycevas

• Kaunas University of Technology

author

Ricardas Taraskevicius

• Nature Research Centre

author

Alexander Khinsky

• Amiagus

author

Aivaras Kareiva

• Vilnius University

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Identifiers

DOI

10.2478/s11532-011-0007-9