Effects of pH and concentration on ability of Cl- and NO 3- to intercalate into a hydrotalcite-like compound during its synthesis

Tomohito Kameda, Toshiaki Yoshioka, Fumiko Yabuuchi, Miho Uchida, Akitsugu Okuwaki

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 (i) Cl-, which has a higher charge density than NO3-, 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 NO3-, was more likely to interact with Mg and Al species to form HT structure, blocking the intercalation of Cl- and NO3-. Furthermore, we showed that high concentrations of Cl- and NO3- in solution regulated their intercalation into the HT interlayer. The high activity of Cl- and NO3- 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.

Original languageEnglish
Pages (from-to)625-629
Number of pages5
JournalBulletin of Materials Science
Volume31
Issue number4
DOIs
Publication statusPublished - 2008 Aug

Keywords

  • Anion
  • Concentration
  • Hydrotalcite-like compound
  • Intercalation
  • Synthesis process
  • pH

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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