多相盐分散体系下层状金属硫化物对铀酰离子的吸附性能研究  

Study on the Adsorption Performance of Layered Metal Sulfide K 1.9 Mn 0.95 Sn 2.05 S 6 for Uranylion UO_(2)2+Under Multiphase Saline Ions Dispersion System

作　　者：杜鹃 白春星 张淑贞 魏世超[1] 李斌[1] DU Juan;BAI Chunxing;ZHANG Shuzhen;WEI Shichao;LI Bin(Research Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China;P.O.Box 158,Baoji 721000,China)

机构地区：[1]核工业理化工程研究院,天津300180 [2]陕西省宝鸡市158信箱,陕西宝鸡721000

出　　处：《山东化工》2025年第4期21-25,共5页Shandong Chemical Industry

摘　　要：制备了无机吸附剂层状金属硫化物K_(1.9)Mn_(0.95)Sn_(2.05)S_(6),实现了多相盐分散体系下对铀的选择性高效吸附和解吸再生利用,并通过理论模型计算的方法对其吸附性能和机理进行了深入分析。结果表明,K_(1.9)Mn_(0.95)Sn_(2.05)S_(6)对UO_(2)^(2+)的饱和吸附容量高达402 mg·g^(-1),盐离子对铀的竞争吸附力大小顺序为Ca^(2+)>Mg^(2+)>Na^(+)。吸附动力学过程符合准二级动力学模型,化学吸附为决速步,吸附速率由外部液膜扩散和颗粒物内扩散共同控制;等温吸附行为符合Langmuir吸附等温线模型,K_(1.9)Mn_(0.95)Sn_(2.05)S_(6)对铀为优势吸附,且反应能够自发进行。The inorganic adsorbent,layered metal sulfide(K_(1.9)Mn_(0.95)Sn_(2.05)S_(6))was prepared.And this selective material was applied in the multiphase salt dispersion system,which acquired efficient adsorption and desorption of uranium.The adsorption performance and mechanism of the adsorbents were analyzed by theoretical model.The results revealed that the saturated adsorption capacity of K_(1.9)Mn_(0.95)Sn_(2.05)S_(6)to UO_(2)^(2+)was as high as 402 mg·g^(-1).Besides adsorption of uranium,this material could also selectively adsorb other salt ions,and the order of adsorption capacity was Ca^(2+)>Mg^(2+)>Na^(+).Fitting analysis suggested that the adsorption process followed the pseudo-second order model,the rate determining step was chemical adsorption,and the adsorption rate was mainly controlled by the diffusion of the external liquid film and inside the particle.The isothermal adsorption behavior was in line with the Langmuir adsorption isotherm model.All those results demonstrated that K_(1.9)Mn_(0.95)Sn_(2.05)S_(6)had advantage to adsorb the uranium ions and this adsorption reaction could be proceed spontaneously.

关 键 词：层状金属硫化物 盐分散体系 吸附 理论模型 

分 类 号：O61[理学—无机化学]