Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions
Synthesis of mesoporous silica-tethered phosphonic acid sorbents for uranium species from aqueous solutions
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DOI：
10.1016/j.colsurfa.2015.04.016
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发表时间：
2015-10-05
影响因子：
5.2
通讯作者：
Jaroniec, Mietek
中科院分区：
文献类型：
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作者：
Dudarko, Oksana A.;Gunathilake, Chamila;Jaroniec, Mietek
在弱酸性pH（3.75）下一锅法合成高度有序的SBA-15型二氧化硅系链膦酸允许更高的膦酸官能团负载（高达33%），而不会显著劣化介观结构。在该合成中，使用偏硅酸钠代替原硅酸四乙酯。所得样品具有高的比表面积（362-533 m2/g）和良好的中孔性。通过XRD、TEM、EDS和元素分析等手段证实了合成产物为六方结构，且膦酸基团含量较高（1.0-3.0 mmol/g）。由于廉价的偏硅酸钠被用作二氧化硅的来源，这些材料可以用于大规模应用。合成材料的实验研究表明，它们在弱碱性条件下（pH 8.3）可有效提取痕量铀物质，这与实际应用有关，例如从海水中提取铀。(C)2015爱思唯尔B. V.保留所有权利。
One-pot synthesis of highly ordered SBA-15 type silica-tethered phosphonic acid at weakly acidic pH (3.75) allows for higher loading of phosphonic functionality (up to 33%) without significant deterioration of the mesostructure. In this synthesis sodium metasilicate was used instead of tetraethylorthosilicate. The resulting samples featured high specific surface areas (362-533 m(2)/g) and well-developed mesoporosity. The hexagonal structure and high concentration of phosphonic acid groups (1.0-3.0 mmol/g) in the synthesized samples were established by XRD, TEM, EDS and elemental analysis methods. Since inexpensive sodium metasilicate was used as a source of silica, these materials can be of interest for large-scale applications. Experimental studies of the synthesized materials showed that they are effective for extraction of trace uranium species under weak basic conditions (pH 8.3), which are relevant for practical use such as uranium extraction from seawater. (C) 2015 Elsevier B.V. All rights reserved.