For the first time, layered double hydroxides (LDHs) with Zn:Al in molar ratio 1:1, intercalated with sulphate and alkali metal cations (Li$^+$, Na$^+$, K$^+$), were synthesized and characterized. The syntheses of Zn/Al-SO$_4$-K was performed by precipitation with increasing pH when the KOH solution was slowly added to acid mixed solutions of ZnSO$_4$, Al$_2$(SO$_4$)$_3$ and K$_2$SO$_4$, with Zn:Al:K in molar ratios of 0.5:0.5:0.167, at 90°C under the dynamic flow of N$_2$. In the exchange reactions, aqueous LDH dispersions were stirred with an excess of Li$_2$SO$_4$ or Na$_2$SO$_4$ for 96 h at room temperature under N$_2$ flow. All the obtained materials were characterized by X-ray diffraction, Fourier transform infrared, scanning electron microscopy and energy dispersive spectroscopy and inductively coupled plasma-optical emission spectrometry analyses. After the reactions, alkali metal cations were exchanged, keeping sulphate constant, showing that this new class of LDHs can exchange cations and has the potential for new applications.
Volume 46, 2023
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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