Uptake of various cations by imperfectly ordered KAlSiO4 prepared by solid-state reaction of kaolinite with K2CO3

Kiyoshi Okada, Masaaki Nemoto, Yoshikazu Kameshima, Atsuo Yasumori

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12 Citations (Scopus)

Abstract

The uptake of various cations by imperfectly ordered KAlSiO4 was investigated. The KAlSiO4 was prepared by solid-state reaction of kaolinite with K2CO3 at 550°C for 24 h. Uptake experiments were performed at 60°C using 0.5 g of the KAlSiO4 and 50 ml of solution containing 10-3-10-1 M of each cation, with and without 0.5 M NaCl buffer. The cations were alkali (Li+ and Na+), alkaline earth (Mg2+, Ca2+, Sr2+ and Ba2+) and transition metal cations (Ni2+, Co2+, Cu2+ and Zn2+). From the comparison of uptakes of various cations by KAlSiO4 and zeolite Na-A, it was found that the ratio of uptake by both exchange materials increased with decreasing ionic radius of the exchanging cations, the KAlSiO4 showing higher uptake of Ni2+ than zeolite Na-A. This trend became more distinct for the uptake of Ni2+ in simulated acid waste solution and ground-water because of the suppressinz effects by co-existing alkali and alkaline earth cations especially for zeolite Na-A.

Original languageEnglish
Pages (from-to)898-903
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume108
Issue number10
Publication statusPublished - Jan 1 2000
Externally publishedYes

Keywords

  • Cation exchanger
  • Cation uptake
  • Environmental materials

ASJC Scopus subject areas

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

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