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In this study, we confirmed that the characteristics of anion intercalation into the interlayer of a hydrotalcite-like compound (HT) during synthesis are similar to those of the anion-exchange reaction of HTs as well as the reconstruction reaction of HTs from Mg-Al oxide. We demonstrated that (i) Cl -, which has a higher charge density than NO -3 , more easily reacted with Mg and Al species to form HT structure, resulting in greater intercalation of Cl -into the HT interlayer; and (ii) for HTs with lower Mg : Al molar ratios, OH -, which has a higher charge density than Cl -and NO -3 , was more likely to interact with Mg and Al species to form HT structure, blocking the intercalation of Cl -and NO -3 . Furthermore, we showed that high concentrations of Cl -and NO -3 in solution regulated their intercalation into the HT interlayer. The high activity of Cl -and NO -3 in solution would facilitate the anions' reactions with Mg and Al species to form HTs, resulting in a high degree of anion intercalation into the interlayer of HTs.

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