Adsorption behavior of Zr(IV) and Hf(IV) on a silica-based macroporous TODGA adsorbent
Adsorption behavior of Zr(IV) and Hf(IV) on a silica-based macroporous TODGA adsorbent
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Zr(IV)和Hf(IV)在二氧化硅基大孔TODGA吸附剂上的吸附行为
DOI：
10.13538/j.1001-8042/nst.2013.04.009
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发表时间：
2013-08
影响因子：
2.8
通讯作者：
Zu Jianhua
中科院分区：
文献类型：
--
作者：
Yin Xiangbiao;Wei Yuezhou;Zu Jianhua
为了分离酸性溶液中的Zr(IV)和Hf(IV)，合成了几种二氧化硅基大孔吸附剂，考察了它们对HCl溶液中Zr(IV)和Hf(IV)的吸附选择性，发现TODGA吸附剂对这两种元素的吸附差异最大。批量研究了酸类型、HCl浓度和温度对TODGA吸附剂吸附Zr(IV)和Hf(IV)行为的影响。实验发现H+对Zr(IV)和Hf(IV)的吸附能力有较强的影响。等温线拟合表明Langmuir模型与实验数据吻合良好。热力学参数表明两种元素的吸附过程均为吸热反应。TODGA吸附剂对Zr(IV)和Hf(IV)的吸附选择性高于Hf(IV)，有望实现两者的相互分离。
In order to separate Zr(IV) and Hf(IV) in acidic solution,several kinds of silica-based macroporous adsorbents were synthesized.Their adsorption selectivity for Zr(IV) and Hf(IV) in HCl solution was investigated,and the TODGA adsorbent for the two elements had the largest adsorption difference.The effects of acid type,HCl concentration,and temperature on the adsorption behavior of Zr(IV) and Hf(IV) onto the TODGA adsorbent were conducted by batch experiments.It was found that H+exhibited a quite strong influence on adsorption capacity of Zr(IV) and Hf(IV).Isotherm fitting showed that the Langmuir model agrees well with the experimental data.The thermodynamic parameters indicate that the adsorption processes for both elements are endothermic reactions.The TODGA adsorbent had the higher adsorption selectivity for Zr(IV) over Hf(IV) and could be promising for their mutual separation.