偕胺肟基聚偏氟乙烯粉体对铀酰离子的吸附研究  

Adsorption of the uranyl Ions on an amidoxime-based polyvinylidene fluoride powder

作　　者：刘西艳[1,2] 虞鸣[1,2] 刘汉洲[1,2,3] 马红娟[1,2] 迟红影 杨晓娟[1,2] 王敏[1,2] 李景烨[1,2] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院核辐射与核能技术重点实验室,上海201800 [3]中国科学院大学,北京100049

出　　处：《辐射研究与辐射工艺学报》2014年第1期36-42,共7页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金项目(11175234;11105210);中国科学院战略性先导科技专项项目(XDA02030200);中国科学院知识创新工程项目(KJCX2-YW-N49);中国科学院知识创新工程领域前沿项目;上海市自然科学基金项目(11ZR1445400;12ZR1453300)资助

摘　　要：通过批量吸附实验研究了辐射接枝技术制备的偕胺肟基聚偏氟乙烯(PVDF-g-PAO)粉体对低浓度铀酰离子的吸附行为,考察铀酰离子初始浓度、温度、pH值对吸附行为的影响。结果表明,PVDF-g-PAO粉体对低浓度铀酰离子的吸附较快,约180 min达动态平衡,吸附过程符合准二级动力学模型和Freundlich等温吸附模型,吸附反应是熵增加的吸热反应。体系pH值对铀酰离子吸附率影响表明,pH值在5?8范围内时,吸附率变化不大,偕胺肟基材料比较适合海水环境下的吸附,同时发现对材料上已吸附铀酰离子可用酸或碱溶液脱附。The adsorption behavior of uranyl ions in low initial concentration on the amidoxime group functionalized polyvinylidene fluoride powder polymeric material （PVDF-g-PAO） was investigated by batch sorption experiments in this paper, while influences of initial uranyl ions concentration, temperature and the pH value were also concerned. The adsorption equilibrium time can be reached after about 180 min. Adsorption kinetic pattern is in good agreement with the pseudo-second-order model, and the Freundlich isotherm model fits the adsorption equilibrium data well. The uranyl ions adsorption on PVDF-g-PAO is pH dependent, where the adsorption rate keeps constant with the pH value ranging from 5 to 8 （being acclimatized to seawater pH value）, but decreases obviously in the acid and alkali system. It is obvious that acid and alkali solutions are effective eluting agents for uranyl ions adsorbed on PVDF-g-PAO powder.

关 键 词：铀酰离子 吸附 偕胺肟基 聚偏氟乙烯 

分 类 号：TL13[核科学技术—核能科学]