New method of treating dilute mineral acids using magnesium-aluminum oxide

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

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


Mineral acids, such as H3PO4, H2SO4, HCl, and HNO3, were treated with magnesium-aluminum oxide (Mg-Al oxide), which behaved as a neutralizer and fixative of anions. Anion removal increased with increasing Mg-Al oxide quantity, time, Mg/Al molar ratio, and initial acid concentration. Up to 95% removal of anions was achieved in 0.5N acids using a stoichiometric quantity of Mg0.80Al0.20O1.10 for H3PO4, 1.75 stoichiometric quantities for H2SO4, or 2.5 stoichiometric quantities for HCl or HNO3 at 20°C over a period of 6h. The final solutions were found to have a pH in the range of 8-12. Selectivity of acid removal was found to follow the following order: H3PO4>H2SO4>HCl>HNO 3. The equivalent of acid removal per 1g of Mg-Al oxide decreased as the Mg/Al molar ratio of Mg-Al oxide increased.

Original languageEnglish
Pages (from-to)1545-1550
Number of pages6
JournalWater Research
Issue number7
Publication statusPublished - 2003 Apr


  • Dilute mineral acid
  • Hydrotalcite
  • Intercalation
  • Mg-Al oxide
  • Treatment

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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