首页> 外文会议>The 26th Symposium on Scientific Basis for Nuclear Waste Management XXVI Dec 2-5, 2002 Boston, Massachusetts, U.S.A. >REDOX REACTIONS OF IRON AND URANIUM DIOXIDE IN SIMULATED CEMENT PORE WATER UNDER ANOXIC CONDITIONS
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REDOX REACTIONS OF IRON AND URANIUM DIOXIDE IN SIMULATED CEMENT PORE WATER UNDER ANOXIC CONDITIONS

机译:缺氧条件下模拟水泥孔隙水中铁和二氧化铀的氧化还原反应

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Results on the chemical behavior of Fe(0) and UO_2(s), as well as the interaction between fresh and corroded iron with U(VI) in simulated cement contacting alkaline solution are reported. Batch experiments were conducted under anoxic conditions at different alkalinities and salt concentrations to investigate: (a) the corrosion of iron foils (b) the U(VI) removal by fresh, aged and pre-treated (with FeS or Fe_3O_4 layers) iron surfaces in a simulated cement pore fluid, (c) the dissolution rates of newly reduced UO_(2.00) slices in simulated cement pore fluid and KOH solutions (pH 12.7) and (d) the isotope exchange reactions between dissolved ~(235)U(VI) and ~(238)UO_2(s). The reacted iron and UO_2(s) surfaces were analyzed by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectra (SEM-EDS), laser Raman spectroscopy and X-ray photoelectron spectroscopy (XPS).
机译:报告了Fe(0)和UO_2(s)的化学行为的结果,以及新鲜和腐蚀铁与U(VI)在模拟水泥接触碱性溶液中的相互作用的结果。在缺氧条件下,在不同的碱度和盐浓度下进行批处理实验,以研究:(a)铁箔的腐蚀(b)通过新鲜,老化和预处理(具有FeS或Fe_3O_4层)的铁表面去除U(VI)在模拟水泥孔隙液中,(c)新还原的UO_​​(2.00)切片在模拟水泥孔隙液和KOH溶液(pH 12.7)中的溶解速率,以及(d)溶解的〜(235)U(VI)之间的同位素交换反应)和〜(238)UO_2(s)。通过X射线衍射(XRD),扫描电子显微镜-能量色散谱(SEM-EDS),激光拉曼光谱和X射线光电子能谱(XPS)分析反应的铁和UO_2表面。

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