采用水热法获得制备层状硫化物K2x MnxSn3-xS6(KMS-1),用扫描电镜(SEM),X射线衍射仪(XRD),傅里叶红外光谱仪(FTIR)对其形貌及结构进行表征.结果表明制备的KMS-1为层状结构,具有良好的晶体结构.采用静态批式法考察了接触时间、温度、Th(Ⅳ)起始浓度,溶液pH、Na+浓度等因素对KMS-1与Th(Ⅳ)的离子交换的影响.结果表明,pH值对KMS-1与Th(Ⅳ)的离子交换反应有显著影响,吸附容量随着溶液pH的增大而增大,且当pH ＞4时吸附容量不再随pH的变化而变化,而Na+离子浓度对吸附影响较弱;KMS-1与Th(Ⅳ)的离子交换反应在4h时反应达到平衡,反应过程符合准二级动力学方程,Qe=180.51 mg·g-1,k =2.005 ×10-4 g·mg-1·min-1;R2 =0.9987;吸附等温线符合Langmuir等温模型,R2为0.9985;热力学数据分析得出:△Ho=60.73 kJ ·mol-1·K-1,△So=19.02 J ·mol-1·K-1和△Go＜0,说明KMS-1吸附Th(Ⅳ)是一个放热且自发的过程,降低温度有利于KMS-1对Th(Ⅳ)的吸附.该离子交换反应最大吸附量为180.51 mg·g-1.
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