Treatment of hydrochloric acid with magnesium-aluminum oxide at ambient temperatures

Tomohito Kameda, Toshiaki Yoshioka, Tatsunosuke Hoshi, Miho Uchida, Akitsugu Okuwaki

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Our results demonstrate that magnesium-aluminum oxide (Mg-Al oxide) can be advantageous in treating hydrochloric acid waste at temperatures between 10 and 30 °C, by acting as both a neutralizer and fixative for Cl-. The Mg-Al oxide was prepared by the thermal decomposition of a hydrotalcite-like compound. The extent of Cl- removal by Mg-Al oxide increased with increases of temperature, oxide quantity and Mg/Al molar ratio. The initial pH had little effect on Cl- removal; the pH increased rapidly from the start of the reaction and attained a nearly constant value. The reaction involved in Cl- removal from HCl by Mg-Al oxide proceeded under surface chemical reaction control, with apparent activation energy of 65.6 kJ mol-1.

Original languageEnglish
Pages (from-to)272-276
Number of pages5
JournalSeparation and Purification Technology
Issue number3
Publication statusPublished - 2006 Oct


  • Hydrochloric acid
  • Hydrotalcite-like compound
  • Magnesium-aluminum oxide
  • Neutralization
  • Ordinary temperature
  • Removal of chloride

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation


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