PAO/TiO_(2)电极的制备及对海水中铀的高效提取研究  

Preparation of PAO/TiO_(2)Electrode and Efficient Extraction of Uranium from Seawater

作　　者：宋艳[1] 陈刚[1] 王凤菊[1] 吴浩天 李子明 李昊 李壑 崔琦 陈树森[1] SONG Yan;CHEN Gang;WANG Fengju;WU Haotian;LI Ziming;LI Hao;LI He;CUI Qi;CHEN Shusen(CNNC Key Laboratory on Uranium Extraction from Seawater,Beijing Research Institute of Chemical Engineering and Metallurgy,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院中核海水提铀技术重点实验室,北京101149

出　　处：《原子能科学技术》2025年第4期816-823,共8页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目(中核科发[2023]384号)。

摘　　要：为探讨电化学技术对海水中U(Ⅵ)的提取性能,本文采用滴涂法制备了偕胺肟基聚丙烯腈修饰的TiO_(2)电极(PAO/TiO_(2)电极),利用SEM、FT-IR、XPS等手段对其进行表征,并通过电化学性能测试考察了电极对模拟海水和真实海水中铀的提取效果。结果表明,PAO/TiO_(2)电极对模拟海水中的U(Ⅵ)有高效捕获能力,铀提取率达89.01%,电极对U(Ⅵ)的选择性优于其他竞争金属离子(VO_(3)^(-)、Fe^(3+)、Co^(2+)、Ni^(2+)、Cu^(2+)、Na^(+)、Mg^(2+)、Ca^(2+));在真实海水中对铀的提取率达59.4%,铀的吸附量为4.07 mg/g。PAO/TiO_(2)电极对U(Ⅵ)的提取机理分析表明,PAO/TiO_(2)电极可通过电吸附和电沉积两步反应实现从海水中提取铀酰离子,是一种具有应用潜力的电极材料。In order to investigate the reduction performance of U(Ⅵ)in seawater by electrochemical technology,TiO_(2)nanotube array electrode was firstly prepared by anodizing method,and then the amidoxime-modified TiO_(2)electrode(PAO/TiO_(2)electrode)was prepared by using the drip coating method to make the amidoxime functional groups loaded on the surface of TiO_(2)electrode.The electrode was characterized by scanning electron microscopy,infrared spectroscopy and X-ray Auger electron spectroscopy.The uranium extraction performance of PAO/TiO_(2)electrode in spiked seawater and real seawater was investigated respectively.The reaction mechanism was also proposed.The results of scanning electron microscopy and infrared spectroscopy show that the surface of the prepared TiO_(2)nanoarray is smooth and the tube diameter is uniform.PAO containing amidoxime functional groups is successfully introduced on the surface of TiO_(2)electrode.The results of performance test in spiked seawater show that PAO/TiO_(2)electrode has a good ability to extract uranium.The extraction rate of uranium is 89.01%when the reaction time is 600 min.The pseudo-second-order kinetic model(R^(2)=0.99583)can better describe the adsorption kinetic process of U(Ⅵ)on PAO/TiO_(2)electrode than the first-order kinetic model(R^(2)=0.98208),indicating that the adsorption process of the electrode material is dominated by chemical adsorption.The selective adsorption performance of U(Ⅵ)on PAO/TiO_(2electrode)is better than that of other competitive metal ions(such as VO_(3)^(-),Fe^(3+),Co^(2+),Ni^(2+),Cu^(2+),Na~+,Mg^(2+),Ca^(2+)).The desorption test was carried out on the electrode material after uranium adsorption,and the results show that the desorption rate of the electrode is 92.12%when 0.4 mol/L Na_(2)CO_(3)used as the desorption agent.The test results in real seawater show that the extraction rate of uranium is 59.4%and the adsorption capacity of uranium is 4.07 mg/g when the reaction time is 28 h.X-ray Auger electron spectroscopy was used to characteri

关 键 词：PAO/TiO_(2)电极 电化学技术 海水提铀 

分 类 号：TL212[核科学技术—核燃料循环与材料]