Abstract

Removal of ⁹⁰Sr from aqueous media by sorbents prepared from bentonite from the Oglanlynski field and by their composites with magnetite is studied. It is shown that the sorbents can be used for purification of large volumes of radioactively contaminated waters. Here, we study bentonite rock material (a natural mineral), montmorillonite in Na-form derived from it, clinoptilolite and cristobalite (impurities in bentonite), and composites obtained by depositing magnetite onto the surface of listed materials. The ⁹⁰Sr sorption is effective in a broad pH range (3.7–9). The developed composites can be successfully used in purification of radioactively contaminated aquatic environments. The magnetite in sorbents functions exclusively as a magnetically active component, which enables us to use an external magnetic field in separation of sludge resulting from water purification process. The maximum adsorption of strontium ions, as calculated from the Langmuir equation, is obtained for montmorillonite in Na-form and the initial rock material: 20.8 and 14.5 mg/g, respectively. For the composites based on these materials, the values are smaller: 18.5 and 10.6 mg/g, respectively. The effectiveness of sorbents for removal of ⁹⁰Sr from natural waters and liquid radioactive wastes is shown to be determined mostly by the mineral content of media to be purified, i.e., the type and concentration of macro elements: Na⁺, K⁺, and Ca²⁺. Among the indicated competing ions, calcium affects the removal of strontium from aquatic environments to the largest extent.

中文翻译：

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Oglanlynski田（土库曼斯坦）的膨润土岩石及其基于复合材料的90 Sr吸附剂

摘要

研究了由Oglanlynski场的膨润土制备的吸附剂及其与磁铁矿的复合物从水性介质中去除⁹⁰ Sr的过程。结果表明，吸附剂可用于净化大量放射性污染的水。在这里，我们研究膨润土岩石材料（一种天然矿物），由其衍生的Na型蒙脱土，斜发沸石和方石英（膨润土中的杂质），以及通过将磁铁矿沉积到所列材料表面而获得的复合材料。在⁹⁰Sr的吸附在广泛的pH范围（3.7–9）中有效。所开发的复合材料可成功用于放射性污染的水生环境的净化。吸附剂中的磁铁矿仅充当磁活性成分，这使我们能够利用外部磁场分离水净化过程产生的污泥。从Langmuir方程计算得出，对于钠型蒙脱石和初始岩石材料，锶离子的最大吸附分别为20.8和14.5 mg / g。对于基于这些材料的复合材料，该值较小：分别为18.5和10.6 mg / g。吸附剂去除⁹⁰的功效天然水和放射性放射性废料中的Sr主要由待净化介质的矿物质含量决定，即，Na ⁺，K ⁺和Ca ²⁺等宏观元素的类型和浓度。在所示竞争离子中，钙最大程度地影响了从水生环境中去除锶。