腐植酸对模拟核反应堆废料中Cs(Ⅰ)和Sr(Ⅱ)的批量吸附和解吸研究  

Batch Adsorption and Desorption Investigations of Cs(Ⅰ)and Sr(Ⅱ)from Simulated Reactor Waste by Humic Acid

作　　者：Asma N.Khan Hemlata K.Bagla 李双(译)[2] Asma N.Khan;Hemlata K.Bagla;Li Shuang(translate)(Department of Nuclear&Radiochemistry,Kishinchand Chellaram College,Mumbai,India,999008;China Humic Acid Industry Association,Beijing,100120)

机构地区：[1]印度Kishinchand Chellaram学院核与放射化学系,孟买999008 [2]中国腐植酸工业协会,北京100120

出　　处：《腐植酸》2024年第4期54-61,共8页Humic Acid

摘　　要：本研究的重点是对放射性核素进行经济有效的富集吸附,然后对其进行选择性解吸,这是分离所必需的。考察了低成本吸附剂腐植酸从模拟核反应堆废料中去除和回收Cs(Ⅰ)和Sr(Ⅱ)的潜力。优化了溶液pH、吸附剂剂量、接触时间和温度等实验参数。比较了吸附前后腐植酸的FT-IR。2种放射性核素均采用解吸剂——柠檬酸和HCl实现了选择性解吸。研究结果表明,该过程受快速动力学控制,在10 min内吸附了91±2%的Cs(Ⅰ)和83±2%的Sr(Ⅱ)。数据建模显示,该过程遵循准二级动力学,是自发的、可行的和放热的,具有的正熵表明腐植酸对金属离子具有高亲和力。Sr(Ⅱ)的最大解吸率为97±2%,Cs(Ⅰ)的最大解吸率为82±2%。腐植酸吸附和解吸所研究的放射性核素是去除和回收Cs(Ⅰ)和Sr(Ⅱ)的一种省时、经济和环保的良好选择。This work focused on cost-effective and collective adsorption of radionuclides followed by their sub-sequent selective desorption,which is necessary for separation.The potential of humic acid,a low-cost adsorbent,for the removal and recovery of Cs(Ⅰ)and Sr(Ⅱ)from simulated reactor waste,was investigated.Experimental parameters like solution pH,adsorbent dose,contact time and temperature were optimized.FT-IR of humic acid before and after adsorption was compared.Selective desorption of both the radionuclides was achieved with desorbing agents-citric acid and HCl.The process was governed by rapid kinetics where 91±2%of Cs(Ⅰ)and 83±2%of Sr(Ⅱ)was adsorbed within 10 min.Data modelling revealed that the process follows pseudo-second-order kinetics,and is spontaneous,feasible and exothermic,with positive entropy indicating a high affinity of humic acid for the metallic ions.Maximum desorption of 97±2%was obtained for Sr(Ⅱ),and 82±2%for Cs(Ⅰ).Thus,the adsorption of investigated radionuclides by humic acid and their desorption was time-effi cient,economical and environmentally a benign alternative for the removal and recovery of Cs(Ⅰ)and Sr(Ⅱ).

关 键 词：吸附 放射性废物 腐植酸 铯 锶 

分 类 号：TQ314.1[化学工程—高聚物工业] X591[环境科学与工程—环境工程]