Fe(Ⅱ)-矿物对亚硒酸的还原作用
The reduction of selenite by Fe(Ⅱ)-containing minerals
查看参考文献54篇
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文摘
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~(79)Se是核反应过程中产生的长半衰期(T_(1/2)=2.95×10~5年)裂片产物核素,具有化学和辐射双重毒性,是高放废物地质处置中重点关注的几个放射性核素之一。硒的溶液化学性质比较特殊,以高价态形式存在的硒酸和亚硒酸,几乎不受溶解度控制,并难以被黏土或花岗岩等处置库围岩介质所吸附,迁移性极强,而当其以低价态(0、–I、–II)形式存在时,易形成固体沉淀。因此将高价态的硒还原生成沉淀是阻滞~(79)Se迁移的最主要方式。从另一方面讲,Fe(II)-矿物是自然界中普遍存在的具有还原性的物质。本文对近年来国内外在Fe(II)-矿物还原亚硒酸方面开展的研究工作进行了一个回顾,并从热力学的角度,对这些矿物还原亚硒酸的可行性及控制产物生成的因素进行了分析。 |
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其他语种文摘
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The radioactive isotope ~(79)Se, with a half-life of 2.95×10~5 years, is presently considered as the key mobile fission product for the disposal of spent fuel and high-level radioactive waste. The solubility of selenium is significantly controlled by its oxidation state, which depends on the redox conditions of the surrounding environment. Tetravalent and hexavalent Se are very soluble and mobile aqueous oxyanions, while Se species with oxidation states 0, –I, and –II are low solubility solids. Due to the weak adsorption of Se(IV) and Se(VI) on natural minerals, in particular on granite or claystone minerals, which are considered as host rocks for nuclear waste disposal, reductive precipitation is considered to be the most effective way to immobilize ~(79)Se. On the other hand, Fe(II)-bearing minerals (such as pyrite, pyrrhotite, magnetite, etc.) are ubiquitous in geological environment. Due to the reducing capacity, reduction of selenite by Fe(II)-containing minerals has received extensive attention worldwide. In this paper, we gave a critical review on the research progress in this field, along with the thermodynamic calculations on the reaction feasibility and the controlling-factor of the reaction products. |
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来源
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中国科学. 化学
,2013,43(5):536-543 【核心库】
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关键词
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高放废物地质处置
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Fe(II)-矿物
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亚硒酸
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还原作用
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地址
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1.
北京大学化学与分子工程学院, 北京分子科学国家实验室;;放射化学与辐射化学国防重点学科实验室;;中国科学院矿物学与成矿学重点实验室, 北京, 100871
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北京大学化学与分子工程学院, 北京分子科学国家实验室;;放射化学与辐射化学国防重点学科实验室, 北京, 100871
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广州, 510640
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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1674-7224 |
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学科
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化学 |
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基金
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核设施退役和放射性废物治理科研专项基金资助
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文献收藏号
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CSCD:4837655
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