Immobilization of Pb2+ with ordinary portland cement - The method using lead hydroxyapatite

Jae Woo Cho, Koji Ioku, Seishi Goto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Lead hydroxyapatite was synthesized hydrothermally at 150°C under saturated vapor pressure for 1h. This apatite or lead nitrate solution was added to ordinary portland cement (OPC) in order to immobilize the Pb2+. In this paper, the effect of Pb2+ on the hydration of OPC, mechanical properties of OPC pastes and the leaching characteristic of Pb2+ from hardened pastes were investigated. An addition of lead hydroxyapatite did not affect the hydration of OPC significantly, while that of lead nitrate solution affected the hydration of OPC. Therefore, a larger amount of Pb2+ could be immobilized by cement paste with lead hydroxyapatite than that with lead nitrate solution. The strength for hardened paste with lead hydroxyapatite was larger than that with nitrate solution. According to the leaching test for pastes, the apparent diffusion coefficient of Pb2+ in the paste with lead hydroxyapatite was smaller than that of Pb2+ in the paste with addition of lead nitrate solution.

Original languageEnglish
Pages (from-to)650-654
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume105
Issue number8
DOIs
Publication statusPublished - 1997 Aug
Externally publishedYes

Keywords

  • (Pb(PO)(OH))
  • Immobilization
  • Lead hydroxyapatite
  • Ordinary portland cement (OPC)
  • Pb

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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