硅胶负载焦磷钼酸锆吸附剂的制备及对铯的吸附

采用两步法合成硅胶负载焦磷钼酸锆吸附剂(ZrMoPP-SiO_2),通过XRF、SEM、TEM、XRD、BET、XPS等方法对吸附剂进行了表征。同时,考察了竞争性离子的存在、酸度的变化对ZrMoPP-SiO_2吸附铯的影响。结果表明:K~+、Na~+、Mg~(2+)、Fe~(3+)、Ca~(2+)五种竞争性离子的存在以及溶液酸度的变化基本不影响吸附剂的吸附性能,并且ZrMoPP-SiO_2对铯的吸附等温线符合Langmuir模型以及吸附动力学符合假二阶动力学方程。吸附铯后,材料ZrMoPP-SiO_2的XPS也显示有铯的存在,表明材料对铯有吸附作用。结果表明,ZrMoPP-SiO_2具有一定的工业应用前景。

Preparation of Phosphomolybdic Acid Zirconium Loaded Silocone and Its Adsorption Performance of Cesium

Phosphomolybdic acid zirconium loaded on silocone (ZrMoPP-SiO2) adsorbent was synthesized by two-step method.The characterizations of the adsorbents were investigated by XRF,SEM,TEM,XRD,BET and XPS methods.The effects of both competitive ions and acidity on cesium adsorption of ZrMoPP-SiO2 were also studied.The adsorption follows a typical Langmuir model and a pseudo second-order kinetic model.After adsorption of cesium,there is cesium peak on XPS of ZrMoPP-SiO2,which means ZrMoPP-SiO2 has great adsorption of cesium.Five co-existing cations and the change of acidity don't affect adsorption ability of ZrMoPP-SiO2.Results show that ZrMoPP-SiO2 has certain industrial application prospect.