• Effects of pH and concentration on ability of Cl and NO$^{–}_{3}$ to intercalate into a hydrotalcite-like compound during its synthesis

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/031/04/0625-0629

• # Keywords

Hydrotalcite-like compound; synthesis process; intercalation; anion; concentration; pH.

• # Abstract

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

1. 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

2. 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.

• # Author Affiliations

1. Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba 07, Aoba-ku, Sendai 980-8579, Japan

• # Bulletin of Materials Science

Volume 45, 2022
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020