一维普鲁士蓝/硅藻土复合材料对Cs^+的吸附

Adsorption of Cs^+on One-Dimensional Prussian Blue/Diatomite

含137 Cs的放射性废水处理在核能及核技术应用中具有重要意义。以表面活性剂十六烷基三甲基溴化钾和十二烷基磺酸钠为模版,合成了一维结构的普鲁士蓝并将其附着在硅藻土表面,制备成一维普鲁士蓝/硅藻土复合材料;在不同的温度、吸附时间、pH值下,分别探究了一维普鲁士蓝/硅藻土复合材料对Cs^+的吸附性能,并研究了溶液中其他阳离子对吸附的影响。结果表明:一维普鲁士蓝/硅藻土对Cs^+的吸附能力随温度(293~318 K)的升高而增加(从42.4 mg/L到61.6 mg/L),其吸附行为符合Langmuir等温线和准二级动力学方程。

The treatment of 137 Cs radioactive waste water is of great importance in the application of nuclear energy and nuclear technology.In this work,one-dimensional structure Prussian blue was synthesized by using surfactant as template,and it was loaded on the surface of diatomite to prepare Prussia blue/diatomite composite material.The performance of one-dimensional Prussian blue/diatomite composite adsorbing Cs^+was investigated under different temperatures,adsorption time and pH values.The effects of other cations on adsorption were also studied.The results show that the adsorption capacity(from 42.4 mg/L to 61.6 mg/L)of one-dimensional Prussia blue/diatomite increases with temperature(from 293 K to 318 K).The adsorption behavior is consistent with Langmuir isotherm model and pseudo-second-order kinetic equation.