硅基HDEHP吸附剂对硝酸体系中Zr(Ⅳ)的吸附  

Adsorption Characteristics of Zr(Ⅳ) From Nitric Acid Solution Using a Silica-Based Macroporous HDEHP Adsorbent

作　　者：楼丽姗 刘瑞芹[1] 韦悦周[1,2] LOU Li-shan;IU Rui-qi;WEI Yue-zhou(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Innovation Center for Metal Resources Utilization and Environment Protection College of Resources and Metallurgy,Guangxi University,Nanning 530000,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240 [2]广西大学金属资源高效利用与环境保护协同创新中心,广西南宁530000

出　　处：《核化学与放射化学》2018年第2期121-126,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(11675102)

摘　　要：以多孔二氧化硅聚合物颗粒为载体,采用真空灌注法合成了一种复合型硅基吸附剂HDEHP/SiO_2-P(二(2-乙基己基)磷酸酯,di-2-ethylhexylphosphoric acid,HDEHP),用于吸附硝酸体系中的Zr(Ⅳ)。通过扫描电子显微镜(SEM)、差热-热重分析(TG-DTA)等手段对吸附剂进行了表征。研究了硝酸体系下,吸附剂对Zr(Ⅳ)的吸附选择性以及时间、温度对吸附性能的影响。结果表明:该吸附剂在一定酸度范围内对Zr(Ⅳ)有良好的吸附选择性;吸附动力学符合准二级动力学模型,吸附平衡时间为15h;吸附等温线符合Langmuir吸附等温线模型;该吸附剂对Zr(Ⅳ)的吸附容量随温度升高而提高,298K时的吸附容量为0.456 mmol/g。HDEHP/SiO_2-P在吸附Zr(Ⅳ)后,用草酸溶液可以有效地将Zr(Ⅳ)解吸下来,解吸率达到98%,解吸的平衡时间在1h以内。A silica-based HDEHP/SiO2-P adsorbent was synthesized to adsorb Zr(Ⅳ)from nitric acid solution.The adsorption behavior of Zr(Ⅳ)from nitric acid solution containing some typical fission products(FPs)was studied.The adsorbent exhibited much higher affinity for Zr(Ⅳ)over other FPs within a wide HNO3concentration range.Also,the obtained results indicate that the Zr(Ⅳ)adsorption capacity reaches to 0.456mmol/g at 298K.The adsorption kinetics and isotherm are well described by the pseudo-second-order model and the Langmuir equation,respectively.Adsorbed Zr(Ⅳ)onto HDEHP/SiO2-P can be effectively eluted by H2C2O4solution in equilibrium time of about 1h,and the desorption ratio reaches 98%.

关 键 词：硅基吸附剂 HDEHP Zr(Ⅳ) 

分 类 号：TL24[核科学技术—核燃料循环与材料]