Spectroscopic studies on U(VI) incorporation into CaCO3: Effects of aging time and U(VI) concentration.
作者： Zhiwei Niu , Xiaoyan Wei , Shirong Qiang , Hanyu Wu , Duoqiang Pan
DOI: 10.1016/J.CHEMOSPHERE.2019.01.010
关键词: Sorption 、 XANES 、 Calcite 、 Nuclear chemistry 、 Chemistry 、 Infrared spectroscopy 、 Extended X-ray absorption fine structure 、 Uranyl 、 Vaterite 、 Attenuated total reflection
摘要: Abstract In this study, the incorporation of U(VI) into CaCO3 under different aging times and concentrations was studied by combining batch experiments, X-ray diffraction (XRD), attenuated total reflection Fourier transformed infrared spectroscopy (ATR-FTIR), extended absorption fine structure (EXAFS) approaches. Batch sorption experiments showed that on calcite strong pH-dependence, high pH beneficial for possibly due to electrostatic attraction between positively charged negatively uranyl tri-carbonate species. XRD patterns [104] facet shifted toward low angle at ∼10.0, which indicated species diffused lattice replacing Ca atoms, then induced expansion crystal cell. The uptake gradually decreased within first 200 h, significantly increased with increasing time. might experience vaterite, transition from vaterite calcite, stages, were confirmed XRD, ATR-FTIR, near-edge (XANES) spectroscopy. As concentration increased, time correspondingly indicating can stabilize phase. EXAFS analyses suggested local moiety changing during process, similar carbonates, however indeed presented in calcite.
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