Cleaner Synthesis of Silylated Clay Minerals for the Durable Recovery of Ions (Co2+ and Sr2+) from Aqueous Solutions,Industrial & Engineering Chemistry Research

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Cleaner Synthesis of Silylated Clay Minerals for the Durable Recovery of Ions (Co2+ and Sr2+) from Aqueous Solutions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-01-24 , DOI: 10.1021/acs.iecr.9b06118
Thomas Thiebault _{1,

2,

3} , Jocelyne Brendlé _{1,

2} , Grégoire Augé ₄ , Lionel Limousy _{1,

2}

Affiliation

The impact of synthesis conditions on the structure and the radionuclide adsorption capacity of silylated clay minerals was evaluated in this study. Two green solvents were selected in this work, phenoxypropanol and glycerol, and various synthesis temperatures (30, 60 and 90 °C) were tested for the preparation of 3-aminopropyltriethoxysilane (APTES)-functionalized Laponites. The resulting adsorbents exhibit various extent and location of the grafting reaction as a function of the used solvent and temperature. These modifications of the reactivity of the materials also impact adsorption and desorption properties of Co²⁺ and Sr²⁺. However, the two ions are well adsorbed whatever the synthesis conditions, and even in bisolute experiments, the adsorption capacity is not systematically proportional to the amount of loaded APTES, highlighting the specific impact of the synthesis conditions. Finally, the very limited desorption in saline solutions suggests that the synthesized adsorbents display suitable properties for the removal of radionuclides from aqueous solutions.

中文翻译：

清洁合成硅烷化粘土矿物，可从水溶液中持久回收离子（Co ²⁺和Sr ²⁺）

研究了合成条件对甲硅烷基化粘土矿物结构和放射性核素吸附能力的影响。在这项工作中，选择了两种绿色溶剂苯氧基丙醇和甘油，并测试了各种合成温度（30、60和90°C）以制备3-氨基丙基三乙氧基硅烷（APTES）官能化的合成皂脂。所得的吸附剂根据所用溶剂和温度的不同，显示出接枝反应的程度和位置。材料反应性的这些改变也会影响Co ²⁺和Sr ^2+的吸附和解吸性能。。但是，无论合成条件如何，这两个离子都被很好地吸附，即使在双绝对实验中，其吸附能力也不与APTES的负载量系统地成正比，这突出了合成条件的特定影响。最后，盐溶液中非常有限的解吸表明，合成的吸附剂显示出从水溶液中去除放射性核素的合适性能。

更新日期：2020-01-26

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