氨基膦酸酯功能化碳材料对钍的选择性电吸附性能研究  

Study on selective electrosorption of thorium by carbon material containing aminophosphonate functional group

作　　者：权家园 付春燕 邓必成 黄亚斌[1,2] 况王强 邝圣庭 廖伍平 QUAN Jiayuan;FU Chunyan;DENG Bicheng;HUANG Yabin;KUANG Wangqiang;KUANG Shengting;LIAO Wuping(Institute of Materials and Chemistry,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;Institute of Rare Earth Materials and Chemistry,Jiangxi Institute of Rare Earths,Chinese Academy of Sciences,Ganzhou 341119,China;School of Rare Earths,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]中国科学院赣江创新研究院材料与化学研究所,江西赣州341119 [2]中国科学院江西稀土研究院稀土材料与化学研究所,江西赣州341119 [3]中国科学技术大学稀土学院,安徽合肥230026 [4]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,吉林长春130022

出　　处：《无机盐工业》2024年第12期42-50,共9页Inorganic Chemicals Industry

基　　金：中国科协青年人才托举工程项目(2022QNRC001);江西省“双千计划”项目(JXSQ2020101005);赣州市“揭榜挂帅”科技项目(赣市科发[2022]57号);赣州市科技计划项目(2022CXRC9671);赣州市“苏区之光”高层次创新团队项目(GZSQZG202301018)。

摘　　要：针对高纯稀土中微痕量放射性元素钍的分离去除,以氨基化的碳纳米管(CNT-N)为基底,制备了氨基膦酸酯功能化碳电极材料(CNT-P)。采用高分辨场发射扫描电子显微镜(SEM)、比表面分析仪、X射线光电子能谱分析仪(XPS)、热重分析仪(TGA)、傅里叶变换红外光谱仪(FT-IR)和电化学工作站等对CNT-P的形貌、组成和电化学性能进行表征和分析。研究了溶液介质、pH、电压、钍离子的初始浓度(c_0)等因素对钍吸附性能的影响。探讨了CNT-P对钍与稀土离子的吸附选择性,考察了CNT-P的再生循环使用性能。结果表明:CNT-P同时包含介孔和大孔结构,其比表面积、孔容和平均孔径分别为111.6 m^(2)/g、0.85 cm~3/g和30.13 nm;CNT-P在盐酸溶液中对钍的最大电吸附容量达219 mg/g;电压为3.5 V时,钍与稀土离子的分离系数均大于10;经5次吸附-解吸循环后,CNT-P对钍的吸附容量是初次吸附的87%,并基本保持稳定。该电极材料对于稀土中微痕量钍的高效去除具有良好的应用前景。To separate and remove trace thorium from rare earths,a carbon electrode material(CNT-P)was prepared by modifying aminated carbon nanotubes(CNT-N)with phosphonate.The morphology,composition and electrochemical properties of CNT-P were analyzed by scanning electron microscope(SEM),surface area analyzer,X-ray photoelectron spectroscopy(XPS),thermogravimetric analyzer(TGA),Fourier transform infrared spectrometer(FT-IR)and electrochemical workstation.The effects of solution medium,pH,voltage and the initial thorium concentration on the adsorption of thorium were studied.The adsorption selectivity of CNT-P toward thorium and rare earths was discussed.The regenerative recycling performance of CNT-P was examined.The results indicated that CNT-P was a mesoporous and macroporous structure combined electrode material,with a BET specific surface area of 111.6 m^(2)/g,a pore volume of 0.85 cm^(3)/g and an average pore size of 30.13 nm.The maximum electrosorption capacity of CNT-P towards thorium reached 219 mg/g in hydrochloric acid solution.The separation factors for Th/REs were higher than 10 at voltage of 3.5 V.After 5 cycles of adsorptiondesorption,the adsorption capacity of CNT-P toward thorium maintained 87%as compared with its initial adsorption and basically kept stable.Therefore,CNT-P showed a promising application prospect for the efficient removal of microtrace thorium from rare earth earths.

关 键 词：碳电极材料 钍 稀土 电吸附 分离 

分 类 号：TQ127.1[化学工程—无机化工]