Adsorption ability for several harmful anions and thermal behavior of Zn-Fe layered double hydroxide

Tenihisa Hongo, Takeshi Iemura, Atsushi Yamazaki

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A zinc-iron layered double hydroxide (Zn-Fe LDH) with sulfate as the interlayer ainon has been prepared by the coprecipitation method. The LDH was dehydrated in three steps below 300°C and transformed to the amorphous phase. The «crystallization from the amorphous phase to ZnO (zincite), ZnFe2O4 (spinel) and Zn3O (SO4) 2 occurred at approximately 450°C. Furthermore, Zn3O (SO 4) 2 decomposed into ZnO, SO2 and O2 above 700°C. The adsorption ability of the Zn-Fe LDH was studied for several harmful anions (phosphate, chromate, borate, fluoride, selenate and arsenate) in aqueous solution, and it showed high selectivity for phosphate, chromate and selenate ions. The Zn-Fe LDH was found to be stable over a wide pH range (pH = 2-12). The adsorption ability for phosphate ions depends on the initial pH and it increases with decreasing pH.

Original languageEnglish
Pages (from-to)192-197
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume116
Issue number1350
DOIs
Publication statusPublished - 2008 Feb

Keywords

  • Harmful anions adsorption
  • Thermalbehavior
  • Zn-Fe layered double hydroxide

ASJC Scopus subject areas

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

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