Visual and in situ Raman spectroscopic observations of the liquid-liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420 °C
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- 作者：Xiaolin Wanga ; b ; xlinwang@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Ye Wana ; Wenxuan Hua ; b ; I-Ming Chouc ; Shenyang Caia ; Nan Lina ; Qiang Zhua ; Zhen Lid
- 关键词：UO2SO4&ndash ; H2O ; Liquid&ndash ; liquid immiscibility ; Raman spectroscopy ; Ion association
- 刊名：The Journal of Supercritical Fluids
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：112
- 期：Complete
- 页码：95-102
- 全文大小：2396 K
文摘
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Liquid–liquid immiscibility was observed in aqueous UO2SO4 solution at ≥285.8 ± 0.5 °C.
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The immiscible liquids are either UO2SO4-rich (Urich) or UO2SO4-poor (Upoor).
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Analyses of UO22+ and SO42− spectra imply increasing ion association upon heating.
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Decrease of ion hydration in Urich phase due to increasing concentration upon heating.
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Reversible strong UO22+–SO42− association results in the liquid–liquid immiscibility.