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Sorption behavior of selenide on montmorillonite

Sugiura, Yuki  ; Tomura, Tsutomu*; Ishidera, Takamitsu ; Doi, Reisuke  ; Francisco, P. C. M.  ; Shiwaku, Hideaki   ; Kobayashi, Toru ; Matsumura, Daiju   ; Takahashi, Yoshio*; Tachi, Yukio  

Batch sorption experiments were performed to investigate the sorption mechanism of Se on montmorillonite under reducing conditions in deep geological environments. Based on Eh-pH diagrams and ultraviolet-visible spectra, Se was dissolved as selenide (Se(-II)) anions under the experimental conditions. The distribution coefficients ($$K_{rm d}$$; m$$^{3}$$ kg$$^{-1}$$) of Se(-II) indicated ionic strength independence and slight pH dependence. The $$K_{rm d}$$ values of Se(-II) were higher than those of Se(IV), which also exists as an anionic species. X-ray absorption near edge spectroscopy showed that the oxidation state of Se-sorbed on montmorillonite was zero even though selenide remained in the solution. These results suggest that Se(-II) was oxidized and precipitated on the montmorillonite surface. Therefore, it is implied that a redox reaction on the montmorillonite surface contributed to high $$K_{rm d}$$ values for Se(-II).

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Category:Chemistry, Analytical

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