四苯基甲烷共价有机框架材料对气态碘的吸附  

Tetraphenylmethane Covalent Organic Frameworksfor Gaseous Iodine Adsorption

作　　者：马建国[1] 方然杰 吴志能 郑雪帆 魏玮 李翠珍[1] 刘淑娟[1] MA Jianguo;FANG Ranjie;WU Zhineng;ZHENG Xuefan;WEI Wei;LI Cuizhen;LIU Shujuan(Fundamental Science on Radioactive Geology and Exploration Technology Laboratory,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,江西南昌330013

出　　处：《东华理工大学学报（自然科学版）》2024年第4期391-400,共10页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(22066004,22166002);放射性地质与勘探技术国防重点学科实验室开放基金项目(2022RGET16)。

摘　　要：为获得高效稳定的气态碘吸附材料,以四苯基甲烷作为醛基单体,分别与4,4’-二氨基三联苯和2,6-二氨基蒽在水热条件下合成了共价有机框架材料(COFs)DpTp-COF和AnTp-COF,合成的材料能够在400℃保持结构稳定,DpTp-COF和AnTp-COF的比表面积分别达到了955 m^(2)/g和786 m^(2)/g。实验条件下DpTp-COF和AnTp-COF对气态碘的最大吸附容量分别为4.75 g/g和4.95 g/g,吸附过程符合准二级动力学方程。吸附碘的COFs材料可以用乙醇实现碘的脱附,经过四次吸附-脱附循环后DpTp-COF和AnTp-COF的最大吸附容量分别降低了19.36%和24.85%。对吸附碘的DpTp-COF和AnTp-COF进行拉曼光谱和X射线光电子能谱表征,发现碘主要以I_(3)^(-)和I_(5)^(-)形式存在于两种材料上,表明COFs材料和碘分子之间发生了电荷转移。For obtaining efficient and stable materials for gaseous iodine adsorption,DpTp-COF and AnTp-COF were synthesized under hydrothermal conditions with tetraphenylmethane as aldehyde monomer,reacting with 4,4’-diaminoterphenyl and 2,6-diaminoanthracene,respectively.The synthesized COFs maintained structural stability at 400℃,and the specific surface areas of DpTp-COF and AnTp-COF were 955 m^(2)/g and 786 m^(2)/g,respectively.Under the experimental conditions,the adsorption capacities of DpTp-COF and AnTp-COF for gaseous iodine were 4.75 g/g and 4.95 g/g,respectively,and the adsorption process conformed to the quasi-second-order kinetic equation.Desorption of iodine was achieved from iodine-loaded COFs by using ethanol.The adsorption capacity of DpTp-COF and AnTp-COF decreased by 19.36%and 24.85%,respectively,after four adsorption-desorption cycles.Raman and XPS spectra characterization of DpTp-COF and AnTp-COF showed that iodine mainly existed in the form of I_(3)^(-)and I_(5)^(-)onto the two materials,indicating that charge transfer occurred between the COFs and iodine molecules.

关 键 词：四苯基甲烷 共价有机框架材料 气态碘 吸附 

分 类 号：O647.3[理学—物理化学]