Publication: Synthesis and characterisation of layered double hydroxides with varying divalent metal cations: Mg2+, Zn2+, Ca2+
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Date
2022
Authors
Limau Jadam M.
Halimah Sarijo S.
Jubri Z.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
This study aims to investigate the physicochemical properties of layered double hydroxides (LDH) with different divalent metal (M2+) cations. A series of nitrate-based LDH materials was synthesised by using aluminium (Al3+) as a trivalent cation (M3+) with varying M2+ cations such as magnesium (Mg2+), zinc (Zn2+), and calcium (Ca2+) ions to prepare magnesium�aluminium-layered double hydroxide (MgAl-LDH), zinc�aluminium-layered double hydroxide (ZnAl-LDH), and calcium�aluminium-layered double hydroxide (CaAl-LDH), respectively. MgAl-LDH and ZnAl-LDH were synthesised by the co-precipitation method, whereas CaAl-LDH was prepared by the hydrothermal method. The samples were characterised by powder X-ray diffraction (PXRD), Fourier transform infrared spectra (FTIR), thermogravimetric and differential thermogravimetric analysis (TGA/DTG), field emission scanning electron microscope (FESEM), and accelerated surface area and porosity (ASAP) analysis. The PXRD patterns show that MgAl-LDH (9.8 �) had the greatest interlayer spacing, followed by ZnAl-LDH (8.9 �), and CaAl-LDH (8.7 �). The FTIR spectra clearly confirms the presence of nitrate ions in the LDH structure. Two-step degradation behaviour of the samples was observed in the TGA curve. The LDHs exhibit Type IV isotherms and hexagonal structures were observed on the FESEM images. � 2022
Description
Aluminum compounds; Fourier transform infrared spectroscopy; Magnesium; Nitrates; Physicochemical properties; Positive ions; Precipitation (chemical); Scanning electron microscopy; Thermogravimetric analysis; Zinc; Ca 2+; Fourier transform infrared spectra; Hydrocalumite; Hydrotalcites; Layered-double hydroxides; Magnesium-aluminum layered double hydroxides; Synthesised; Zinc aluminiums; Zinc-aluminum; Zn 2+; Calcium