Synthesis of hydrotalcite from seawater and its application to phosphorus removal

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10 Citations (Scopus)


10.0 wt% milk of lime was added to seawater containing AlCl3 at Mg/Al molar ratio of 3.0 until pH 10.5 with stirring, and kept at 25°C for 1 h. Hydrotalcite (HT) was precipitated as a single phase, and Mg2+ and Al3+ were quantitatively precipitated. The chemical composition was [Mg0.75Al0.25(OH)2][(SO4) 0.06(Cl)0.02(OH)0.11*]·0.27H 2O* (*Balance). A 100 mg-P/L Na2HPO4 solution and the HT were shaken at 25°C. Phosphate removal increased with increasing time and the HT quantity, and was the highest at pH 7-9. Phosphate ion could be quantitatively removed, adding 8 times the stoichiometric quantity of the HT at pH 8.7 for 6 h.

Original languageEnglish
Pages (from-to)1503-1506
Number of pages4
JournalPhosphorus, Sulfur and Silicon and Related Elements
Issue number6-7
Publication statusPublished - 2002


  • Anion exchange
  • Hydrotalcite
  • Milk of lime
  • Phosphorus removal
  • Seawater
  • Synthesis

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Inorganic Chemistry


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