温度对Pu在膨润土中吸附的影响及热力学研究  

The Influence of Temperature on the Adsorption of Pu on Bentonite and the Thermodynamics Study

作　　者：宿吉龙[1] 庹先国[2,3] 冷阳春[1] 岳萍[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]地质灾害防治与地质环境保护国家重点实验室,成都610059 [3]西南科技大学核废物与环境安全国防重点学科实验室,绵阳621010

出　　处：《科学技术与工程》2013年第36期10823-10827,10833,共6页Science Technology and Engineering

基　　金：国家杰出青年科学基金(41025015)资助

摘　　要：通过静态吸附实验,探讨了高庙子膨润土、钙基膨润土、钠基膨润土和漂白土分别在293.15 K、313.15 K、333.15 K条件下,不同钚浓度对膨润土吸附的影响;以及膨润土对钚吸附的相关热力学参数进行计算。结果表明:随着钚浓度的增大,膨润土吸附能力不断增大;但一定浓度后,吸附达到饱和。四种膨润土均符合Freundlich等温吸附模型。通过计算热力学参数ΔG、ΔS和ΔH,得出钚吸附是一个吸热自发的过程。四种膨润土的吸附能力由大到小是:钙基膨润土>高庙子膨润土>漂白土>钠基膨润土。The adsorption of Pu on GMZ-bentonite, Ca-bentonite, Na-bentonite and bleaching earth is studied in different the concentration of Pu at 293.15 K, 313.15 K and 333.15 K, and the thermodynamics parameters for the adsorption of Pu were determined. The experimental results show the adsorption capacity of bentonite increased with increasing of the concentration of Pu, the adsorption will saturate when concentration reach certain value. The adsorption isotherms were simulated by Freundlich models. The thermodynamics date indicated that the adsorption reaction was exothermic and process of sorption. The order of the adsorption capacity of bentonites are Ca-bentonite 〉 GMZ-bentonite 〉 bleaching

关 键 词：膨润土 ^239Pu 吸附行为 热力学 

分 类 号：TL273[核科学技术—核燃料循环与材料]