Quantification of exchangeable cations in interlayer of Tsukinuno sodium-montmorillonite

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this study, the cation exchange capacity (CEC) and leached exchangeable cations (LC) of montmorillonite purified irons bentonite produced in the Tsukinuno bentonite mine, Yamagata, Japan, were measured, and the exchangeable cations in the interlayer of the montmorillonite were discussed. A montmorillonite, in which the soluble minerals were completely removed, was prepared. Kunipia-F and Kunipia-P, for which both bentonites originally contain approximately 100 wt.% montmorillonite, were used as the initial material. All of the measurements were carried out in a N2 atmosphere-controlled glove-box. The CEC values of montmorillonites for both bentonites (100-110 rneq/100g) were similar to data conventionally reported, and the sum of LC was also approximately in good agreement with the CEC values. The share of Na + in the interlayer of montmorillonite calculated from the LC was about 3/4 of the sum of the LC (≈ CEC), and Mg2+ and Ca 2+ occupied about 7 and 19 %, respectively. Although montmorillonite in bentonite produced in the Tsukinuno bentonite mine is known as a Na type, the sum of Ca2+ and Mg2+ occupied about 26 % of all exchangeable cations in the interlayer. Based on these data, the ion exchange reaction constant between Na+ and H+ in the interlayer of montmorillonite was calculated to be -0.07. This is nearly 2 orders of magnitude lower than data that are usually adopted.

Original languageEnglish
Title of host publicationScientific Basis for Nuclear Waste Management XXXIII
Pages529-536
Number of pages8
Publication statusPublished - Dec 1 2009
Externally publishedYes
Event32nd Symposium on Scientific Basis for Nuclear Waste Management - St. Petersburg, Russian Federation
Duration: May 24 2009May 29 2009

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1193
ISSN (Print)0272-9172

Other

Other32nd Symposium on Scientific Basis for Nuclear Waste Management
CountryRussian Federation
CitySt. Petersburg
Period5/24/095/29/09

ASJC Scopus subject areas

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

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