PAO/In-N-C电极材料对海水中铀的提取性能研究  

Extraction Performance of PAO/In-N-C Electrode Materials for Uranium from Seawater

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

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《湿法冶金》2025年第2期215-221,共7页Hydrometallurgy of China

基　　金：中核集团青年英才科研项目(中核研发[2023]384号)。

摘　　要：研究了以石墨毡为基体材料,采用化学改性法和涂覆法制备偕胺肟修饰的铟-氮-碳电极材料(PAO/In-N-C),并利用电化学工作站从海水中提取铀。考察了电极材料用量、外加电压、加标海水pH、吸附时间对该电极材料从低浓度加标海水中提取铀的影响,测试了该电极材料的离子选择性和循环使用性能,探讨了该电极与铀酰离子的作用机制。结果表明:针对pH=8.10的加标海水,在外加电压为-3~0 V、PAO/In-N-C电极材料用量7 mg、吸附时间400 min条件下,铀提取率为71.16%;PAO/In-N-C电极还原加标海水中的铀分为电吸附和电沉积2步,先利用电磁场加速UO_(2)^(2+)迁移到电极表面,再形成电中性化合物UO 2沉积在电极表面。该材料吸附动力学性能显著,具有较好的离子选择性和重复使用性,有望用于海水提铀。An indium-nitrogen-carbon electrode material(PAO/In-N-C)modified with amidoxime was prepared using graphite felt as matrix material by chemical modification and coating,and uranium was extracted from seawater by electrochemical workstation.The effects of the PAO/In-N-C electrode material dosage,applied voltage,pH of spiked seawater and adsorption time on the extraction of uranium from low-concentration spiked seawater were investigated.The ion selectivity and recycling performance of the electrode material were tested,and the interaction mechanism between the electrode and uranyl ions was discussed.The results show that the extraction rate of uranium is 71.16%under the conditions of applied voltage of-3~0 V,PAO/In-N-C electrode material dosage of 7 mg,adsorption time of 400 min,and seawater pH=8.10.PAO/IN-N-C electrode material reduction of uranium in seawater is divided into two steps:electroadsorption and electrodeposition.Firstly,the electromagnetic field is used to accelerate the migration of UO_(2)^(2+)to the electrode surface,and then the electroneutral compound UO_(2) is formed and deposited on the electrode surface.The material has remarkable adsorption kinetics,good ion selectivity and reusability,and is expected to be used for uranium extraction from seawater.

关 键 词：海水提铀 PAO/In-N-C电极 加标海水 铀 提取 

分 类 号：TL212[核科学技术—核燃料循环与材料]