Investigation of Uranyl Adsorption on Mesoporous Titanium-based Sorbents
Investigation of Uranyl Adsorption on Mesoporous Titanium-based Sorbents
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DOI：
10.1524/ract.1999.84.1.37
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Y. Shin;M. C. Burleigh;S. Dai;C. Barnes;Z. Xue
中科院分区：
文献类型：
--
作者：
Y. Shin;M. C. Burleigh;S. Dai;C. Barnes;Z. Xue
通过胶束模板法水热合成制备了不同硅钛比的介孔钛硅溶胶-凝胶材料。通过红外光谱、氮吸附、粉末X射线衍射和酸碱滴定对制备的样品进行了表征。在pH = 5.10时测定了样品对铀酰离子（UOi"^）的吸收。纯介孔二氧化钛的铀酰负载容量被确定为最大。该容量远高于相应的微孔材料。容量的增加与介孔材料的表面活性剂模板合成方法引起的大表面积、TiO"表面功能浓度的增加有关。 配体和介孔材料的大孔开口，允许进入内孔表面。我们的介孔吸附剂的吸附动力学比相应的微孔材料快得多。 15 分钟内即可达到吸附平衡。
Mesoporous titanosilicate sol-gel materials with different Silicon to titanium ratios were prepared by hydrothermal synthesis through the micellar template approach. The prepared samples have been characterized via infrared spectroscopy, nitrogen Sorption, powder X-ray diffraction, and acid-base titration. The uptake of uranyl ion (UOi"^) by the samples was determined at pH = 5.10. The uranyl loading capacity of the pure mesoporous titania was determined to be the largest. This capacity is much higher than that of the corresponding microporous material. The increase of capacity is correlated to the large surface area induced by the Surfactant template synthetic method for mesoporous materials, increased concentrations of TiO" surface functional ligands, and large pore openings of the mesoporous materials allowing for access to the inner pore surfaces. The adsorption kinetics of our mesoporous sorbents are much faster than those of the corresponding microporous materials. The adsorption equilibria can be reached in less than 15 min.