基于聚多巴胺功能化石墨烯复合材料的聚苯乙烯微塑料电化学印迹传感器研究  

On Electrochemical Imprinting Sensor of Polystyrene Microplastic Based on Polydopamine Functionalized Graphene Composite

作　　者：张龙柯 杨猛 黄行九[1,2] ZHANG Longke;YANG Meng;HUANG Xingjiu(Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,安徽合肥230031 [2]中国科学技术大学科学岛分院,安徽合肥230026

出　　处：《安徽工程大学学报》2022年第5期7-13,共7页Journal of Anhui Polytechnic University

基　　金：国家自然科学基金资助项目(21735005);安徽省自然科学基金资助项目(2008085QB79)。

摘　　要：这项研究结合多巴胺的弱还原性和碱性条件下自聚合的性质,将盐酸多巴胺与氧化石墨烯一步法合成聚多巴胺功能化石墨烯复合材料(PDA-rGO)。PDA-rGO导电性能优异,并且含有大量的苯环结构可与聚苯乙烯微塑料产生π-π相互作用。利用滴涂的方法修饰在玻碳电极上制备PDA-rGO电极,然后将修饰了聚苯乙烯微球的PDA-rGO电极置于邻苯二胺溶液中进行电聚合制备聚合物薄层,洗脱聚苯乙烯后留下与聚苯乙烯尺寸相同的识别位点,以铁氰化钾为分子探针研究电化学传感器对聚苯乙烯微塑料的检测性能。实验结果表明,电化学传感器在实际水样中可以检测1~600 ppb范围内的200 nm聚苯乙烯微塑料,为低浓度小尺寸微塑料的检测提供了一条新的思路。According to the weak reducibility of dopamine and the self-polymerization property under alkaline conditions,this study synthesized polydopamine-functionalized graphene materials(PDA-rGO)by one-step synthesis of dopamine hydrochloride and graphene oxide.PDA-rGO had excellent electrical conductivity and contained a large number of benzene ring structures,which could produceπ-πinteractions with polystyrene microplastics.The PDA-rGO electrode was prepared on the glassy carbon electrode by the method of drop coating.A large amount of polystyrene microspheres were modified on the PDA-rGO electrode and then the electrode was placed in an o-phenylenediamine solution for electropolymerization to prepare a thin polymer layer.[Fe(CN)6]3-was used as a molecular probe to study the detection performance of electrochemical sensors for polystyrene microplastics.The results show that the electrochemical sensors can detect 200 nm polystyrene microplastics within the range of 1~600 ppb in actual water samples.It presents a new idea for the detection of low-concentration and small-sized microplastics.

关 键 词：聚苯乙烯微塑料 石墨烯 铁氰化钾 电化学传感器 聚多巴胺 

分 类 号：O657.1[理学—分析化学]