Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater
Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater
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DOI：
10.1007/s10967-015-4470-1
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发表时间：
2016-02-01
影响因子：
1.6
通讯作者：
Mimura, H.
中科院分区：
文献类型：
--
作者：
Chen, Z.;Wu, Y.;Mimura, H.
采用溶胶-凝胶法制备了K2 Ti6 O 13/SiO2吸附剂，并在500 ℃下形成了良好的微晶K2 Ti6 O 13相。吸附剂吸附Sr 2+前后的EDS分析表明，K+与Sr 2+之间发生了离子交换反应。吸附等温线用Freundlich和Langmuir-Freundlich模型拟合效果最好。实验结果表明，Sr 2+溶液和模拟福岛废水的去除均符合准二级动力学方程。pH值接近中性时对Sr 2+的吸附效果较好。处理福岛废水的穿透能力随着流速的减小和床层直径的增大而增大。
K2Ti6O13/SiO2 adsorbents were prepared by sol-gel method and good microcrystalline K2Ti6O13 phases were formed at 500 degrees C. From EDS of the adsorbents before and after adsorption of Sr2+ it showed that there was ion-exchange reaction between K+ and Sr2+. Experimental data on adsorption isotherms were best fit by the Freundlich and Langmuir-Freundlich model. The experimental data indicated that the pseudo-second order kinetic equation was best fit for both single Sr2+ solution and simulated Fukushima wastewater. The pH approaching to neutral displayed a better adsorption behavior for Sr2+ solution. The breakthrough capacity for treatment of Fukushima wastewater increased with decreasing flow rate and increasing bed diameter.