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Microwave-assisted synthesis of ternary Li-M-Al LDHs (M = Mg, Co, Ni, Cu, Zn, and Cd) and examining their use in phenol oxidation by Dileep Kumar Yadav; Sitharaman Uma; Rajamani Nagarajan is a Materials Science article available to read on EtoBox.

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It remained challenging to synthesize Li and Al-containing ternary Li-M-Al layered double hydroxides (LDH) because LiI and other metal ions (MII or MIV) prefer different atomic positions, consequently making traditional methods such as co-precipitation or hydrothermal method fail. In the present work, several transition (Co, Ni, Cu) and non-transition (Mg, Zn, Cd) metal ions incorporated ternary Li-M-Al LDHs were synthesized by reacting LiAlH4 and different divalent metal nitrates under microwave-assisted hydrolysis reaction. The layer arrangement formation was verified from powder X-ray diffraction and SEM images, while the presence of three cations in all these samples was confirmed from ICP-AES measurements. FTIR and Raman spectra of these samples confirmed the nitrate anion's (majorly) presence in the interlayer space and the fingerprint bands due to the hydroxide units. The thermal traces contained a two-step dehydroxylation, suggestive of the existence of three cations in the hydroxide layers. Isothermal magnetization of ternary LDH containing Co, Ni, and Cu showed paramagnetic behavior at room temperature. On calcination, α-LiAlO2 and other metal oxides were formed. All the

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Author

Dileep Kumar Yadav; Sitharaman Uma; Rajamani Nagarajan

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Materials Science (Physical Sciences)