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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A luminescence line-narrowing spectroscopic study of the uranium(VI) interaction with cementitious materials and titanium dioxide
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A luminescence line-narrowing spectroscopic study of the uranium(VI) interaction with cementitious materials and titanium dioxide

机译：铀（VI）与胶凝材料和二氧化钛相互作用的发光线窄光谱研究

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摘要

Non-selective luminescence spectroscopy and luminescence line-narrowing spectroscopy were used to study the retention of UO22+ on titanium dioxide (TiO2), synthetic calcium silicate hydrate (C-S-H) phases and hardened cement paste (HCP). Non-selective luminescence spectra showed strong inhomogeneous line broadening resulting from a strongly disordered UO22+ bonding environment. This problem was largely overcome by using luminescence line-narrowing spectroscopy. This technique allowed unambiguous identification of three different types of UO22+ sorbed species on C-S-H phases and HCP. Comparison with spectra of UO22+ sorbed onto TiO2 further allowed these species to be assigned to a surface complex, an incorporated species and an uranate-like surface precipitate. This information provides the basis for mechanistic models describing the UO22+ sorption onto C-S-H phases and HCP and the assessment of the mobility of this radionuclide in a deep geological repository for low and intermediate level radioactive waste (L/ILW) as this kind of waste is often solidified with cement prior to storage.
机译：非选择性发光光谱法和发光线窄化光谱法用于研究UO22 +在二氧化钛（TiO2），合成硅酸钙水合物（C-S-H）相和硬化水泥浆（HCP）上的保留。非选择性发光光谱显示由于强烈无序的UO22 +键合环境导致强烈的不均匀线展宽。通过使用发光线变窄光谱技术可以大大克服这个问题。该技术可以明确鉴定C-S-H相和HCP上三种不同类型的UO22 +吸附物质。与吸附在TiO2上的UO22 +的光谱进行比较，可以进一步将这些物质分配给表面复合物，引入的物质和类似尿酸盐的表面沉淀物。该信息为描述UO22 +吸附到CSH相和HCP上的机理模型提供了基础，并为中低放射性废物（L / ILW）在深层地质库中评估这种放射性核素的迁移率提供了条件，因为这种废物通常是储存前用水泥固化。

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