2.
SEM images of (a) Mg4Al1-LDH and (b–f) Mg4Al1O-T with different calcination temperatures: (b) Mg4Al1O-300, (c) Mg4Al1O-400, (d) Mg4Al1O-500, (e) Mg4Al1O-600, and (f) Mg4Al1O-700.
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