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Journal Articles

Adsorption mechanism of ReO $_{4}$ $^{-}$ on Ni-Zn layered hydroxide salt and its application to removal of ReO $_{4}$ $^{-}$ as a surrogate of TcO $_{4}$ $^{-}$

Tanaka, Kazuya; Kozai, Naofumi; Yamasaki, Shinya*; Onuki, Toshihiko; Kaplan, D. I.*; Grambow, B.

Applied Clay Science, 182, p.105282_1 - 105282_8, 2019/12

https://doi.org/10.1016/j.clay.2019.105282

Times Cited Count：16 Percentile：69.69(Chemistry, Physical)

In this study, Ni-Zn layered hydroxide salt (LHS) was used for adsorption experiments of ReO $_{4}$ $^{-}$ , as a surrogate of TcO $_{4}$ $^{-}$ , in aqueous solutions with various initial Re and sodium salt concentrations. The maximum adsorption amount of Re was estimated at 127.7 mg/g (6.86 10 $^{-4}$ eq/g) by fitting adsorption isotherm of ReO $_{4}$ $^{-}$ to Langmuir plot. The adsorption of ReO $_{4}$ $^{-}$ at neutral pH was a reversible process by anion exchange, and decreased with increasing Cl $^{-}$ , NO $_{3}$ $^{-}$ and SO $_{4}$ $^{2-}$ in solution. EXAFS analysis indicated that ReO $_{4}$ $^{-}$ was adsorbed as an outer-sphere complex on Ni-Zn LHS. The Ni-Zn LHS is a more robust adsorbent for ReO $_{4}$ $^{-}$ than the Mg-Al LDH in terms of solution pH and tolerance to competing anions, and may be an effective alternative to the traditional and more limited method of removing aqueous TcO $_{4}$ $^{-}$ by reductive precipitation.