Uptake of various cations by imperfectly ordered KAlSiO 4 prepared by solid-state reaction of kaolinite with K 2CO 3

Kiyoshi Okada, Masaaki Nemoto, Yoshikazu Kameshima, Atsuo Yasumori

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Abstract

The uptake of various cations by imperfectly ordered KAlSiO 4 was investigated. The KAlSiO 4 was prepared by solid-state reaction of kaolinite with K 2CO 3 at 550°C for 24 h. Uptake experiments were performed at 60°C using 0.5 g of the KAlSiO 4 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 (Mg 2+, Ca 2+, Sr 2+ and Ba 2+) and transition metal cations (Ni 2+, Co 2+, Cu 2+ and Zn 2+). From the comparison of uptakes of various cations by KAlSiO 4 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 KAlSiO 4 showing higher uptake of Ni 2+ than zeolite Na-A. This trend became more distinct for the uptake of Ni 2+ 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
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume108
Issue number10
Publication statusPublished - 2000
Externally publishedYes

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Keywords

  • Cation exchanger
  • Cation uptake
  • Environmental materials
  • Imperfectly ordered KAlSiO

ASJC Scopus subject areas

  • Ceramics and Composites

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