冠醚功能化氧化石墨烯对Sr(Ⅱ)的选择性萃取与检测  

Crown ether functionalized graphene oxide for the selective extraction and determination of Sr(Ⅱ)

作　　者：秦武军 康晶燕 师彦平[1] 哈伟[1] QIN Wu-jun;KANG Jin-yan;SHI Yan-ping;HA Wei(CAS Key Laboratory of Chemistry of Northwestern Plant Resources,Key Laboratory for Natural Medicine of Gansu Province,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所,中国科学院西北特色植物资源化学重点实验室和甘肃省天然药物重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《化学研究与应用》2021年第11期2133-2142,共10页Chemical Research and Application

基　　金：国家重点研发计划项目(2017YFF0211100)资助;国家自然科学基金项目(21775153)资助。

摘　　要：通过酰胺键将反式二胺基二苯并-18-冠-6(trans-DAmDB18C6)高效接枝在氧化石墨烯表面,制备了新型的冠醚修饰的氧化石墨烯复合材料(GO-DAmDB18C6)。采用扫描电镜、透射电镜、傅里叶转换红外光谱、同步热分析仪和元素分析仪对复合材料的形貌、结构及元素组成进行了表征。该复合材料被进一步应用于Sr(II)的选择性萃取,实验结果表明GO-DAmDB18C6复合材料对Sr(II)具有较好的吸附性能和选择性。萃取机理研究表明,复合材料对Sr(II)的吸附行为接近于冠醚和Sr(II)之间形成络合物的单层化学吸附过程,符合准二级动力学模型和Langmuir等温模型。结合电感耦合等离子体发射光谱(ICP-OES)检测技术,基于GO-DAmDB18C6复合材料的固相萃取方法可实现水中Sr(II)的高效富集与高灵敏检测,该方法线性范围为0.01~10.0 mg·L^(-1),检测限为15μg·L^(-1)。A novel crown ether-modified graphene oxide composite(GO-DAmDB18C6)was prepared by grafting trans-di(aminobenzo)-18-crown-6(trans-DAmDB18C6)onto the surface of GO via an amide bond.The morphology,structure and element composition of composite materials were characterized by using Fourier transform infrared spectroscopy,synchronous thermal analyzer,scanning electron microscopy,transmission electron microscopy and element analyzer.The resultant composite could be used as a solid-phase extraction adsorbent for the extraction of Sr(II)and exhibited good adsorption performance and selectivity for Sr(II).Studies on extraction mechanism showed that the adsorption behavior of GO-DAmDB18C6 composite materials towards Sr(II)was close to the monolayer chemical adsorption process of complexes formed between DAmDB18C6 and Sr(II),which conformed to the Pseudo-second-order kinetic model and Langmuir isothermal model.Combined with Inductively Coupled Plasma Optical Emission Spectrum(ICP-OES)detection technology,the solid-phase extraction method based on GO-DAmDB18C6 composite material could achieve high efficiency enrichment and high sensitivity detection of Sr(II)in water,with a linear range of 0.01~10.0 mg·L^(-1) and a detection limit of 15μg·L^(-1).

关 键 词：固相萃取 氧化石墨烯 冠醚 锶离子 

分 类 号：O658.2[理学—分析化学]