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Sorption studies of cesium on TiO_2-SiO_2 mixed gel spheres

机译：铯在TiO_2-SiO_2混合凝胶球体上的吸附研究

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摘要

TiO_2-SiO_2 mixed gel spheres used for the sorption studies of cesium were prepared via sol-gel method.The source solutions used for the process were prepared from different mixtures of 1 M TiCl_4 and 1 M Na_2SiO_3 solutions and converted into droplets in a gelation column.The suitable spheres for cesium adsorption were obtained using a methyl isobutyl ketone solution as the drop formation medium and ammonia as the gelling agent.The mixed oxide gels were identified and characterized by Analysis Adsorptive(N_2),DTA/TGA,FTIR and XRD analyses.The sorption behavior of Cs~+ cations on TiO_2-SiO_2 mixed gel spheres has been studied as a function of TiO_2 weight ratio,pH,time,cation concentration,temperature and competing ions.Sorption data have been interpreted in terms of Freundlich and Dubinin-Radushkevich equations.Sorption of Cs~+ cations were found to be endothermic in nature with DELTAH deg(kJ/mol)of 5.06,and DELTAs deg(kJ/(mol K))of 0.06.Negative AG deg value obtained for Cs~+ cations indicates the spontaneity of its sorption on mixed oxide gel spheres.
机译：通过溶胶-凝胶法制备了用于铯吸附研究的TiO_2-SiO_2混合凝胶球体。该工艺的源溶液由1M TiCl_4和1M Na_2SiO_3溶液的不同混合物制备，并在凝胶柱中转化为液滴以甲基异丁基酮溶液为滴液形成介质，氨水为胶凝剂，获得了适合铯吸附的球体。通过分析吸附剂（N_2），DTA / TGA，FTIR和XRD分析鉴定并表征了混合氧化物凝胶。研究了Cs〜+阳离子在TiO_2-SiO_2混合凝胶球上的吸附行为与TiO_2重量比，pH，时间，阳离子浓度，温度和竞争离子的关系。发现自然界中Cs〜+阳离子的吸热是吸热的，DELTAH deg（kJ /（mol K））为5.06，Δdeg（kJ /（mol K））为0.06.Cs〜获得的AG负值+阳离子表示其在混合氧化物凝胶球体上的吸附自发性。

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