Uptake of various cations by amorphous BaAl2Si2O8 prepared by solid-state reaction of kaolin with BaCO3

Kiyoshi Okada, Hiroyuki Arai, Yoshikazu Kameshima, Atsuo Yasumori, Kenneth J.D. MacKenzie

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The uptake of various ions by amorphous and crystalline BaAl2Si2O8 was investigated. The BaAl2Si2O8 samples were prepared by solid-state reaction of kaolin ground with BaCO3 for periods from 1 to 24 h followed by firing at temperatures of 800-1200 °C for 24 h. Uptake experiments were performed at room temperature (25 °C) using a solid/solution ratio of 0.1 g/50 ml, with a cation concentration of 10-3 M and reaction time of 24 h. The cations used for the uptake experiments were alkaline earth ions (Mg2+, Ca2+ and Sr2+) and transition metal ions (Ni2+, Co2+, Cu2+ and Zn2+). The uptake of alkaline earth ions was low in all the samples while the transition metal ion uptakes were higher in the amorphous BaAl2Si2O8 sample than crystalline BaAl2Si2O8 samples. The high uptake of transition metal ions by the amorphous sample was further enhanced by prolonging the grinding time. Since the amorphous sample appears from the 29Si and 27Al NMR spectra to have a similar local structure to crystalline hexacelsian (double-layered structure consisted of alternatively corner shared AlO4 and SiO4 tetrahedra), the uptake of transition metal ions is suggested to occur by release of interlayer Ba ions in the vicinity of edge sites with the adsorption of transition metal ions from the solution.

Original languageEnglish
Pages (from-to)3554-3559
Number of pages6
JournalMaterials Letters
Issue number22-23
Publication statusPublished - Jul 2003
Externally publishedYes


  • Amorphous BaAlSiO
  • Selectivity of transition metal ions
  • Uptake of transition metal ions

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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