The Construction Of Electrochemical Sensors Based On Nanomaterials And Detection Of Phenols And Hydrazine

With the rapid development of industrial,the pollutant of phenols and hydrazine hydrate do harm to people's health seriously.Therefore,the detection of these pollutants is of great significance to protect the ecological environment and maintain human health,and becomes a research focus in the analytical chemistry.Based on its high sensitivity,excellent selectivity,low cost,fast response,time-saving and simple operation,electrochemical sensor has been widely used in environmental analysis,clinical diagnosis,food safety and other fields.Recently,various novel nano materials combined with electrochemical sensor technology promote the development and the applicationof electrochemical sensor.In my paper,a series of novel and convenient electrochemical sensors based on Nitrogen doped graphene quantum dots/Zirconiumdioxidefilm,polydopamine/graphenequantumdotsfilmand chitosan-MWNTs/molybdenum disulfide film as the research object,were developed for the determination of hydrazine hydrate,nitrophenol,acetaminophen.?1?Synthesis of nitrogen-doped graphene quantum dots?N-GQDs?by hydrothermal method,then Zirconyl chloride octahydrate?ZrOCl₂.8H₂O?were directly deposited on N-GQDs by electro-deposition method,the modified electrode exhibits excellent performance to the detection of hydrazine.The N-GQDs/ZrO₂ were characterized by scanning electron microscopy?SEM?and infrared spectroscopy?FT-IR?.We also explored its electrochemicalandelectrocatalyticperformance,themodifiedelectrodeshows excellentelectrocatalytic for hydrazine and can be used as a good electrochemical sensor.The determination range of N₂H₄·H₂O is from 1.0 to 150?M with a detection limit of0.115?M?S/N=3?asnd sensitivity of 1306?A mM^-1cm^-2.?2?The graphene quantum dots?GQDs?were synthesized by hydrothermal method using citric acid as carbon souce,then synthesized poly dopamine-graphene quantum dots?PDA-GQDs?composite by“One-pot”synthesis procedure,and then modified gold electrode?GE?.The PDA-GQDs were characterized by scanning electron microscopy?SEM?.Electrochemical results demonstrate that the PDA-GQDs/GE can simultaneous detection of o-nitrophenol?o-NP?,m-nitrophenolm?m-NP?,p-nitrophenolm?p-NP?,and also has good selectivity and sensitivity.?3?Chit-MWCNTs and molybdenum disulfide?MoS₂?composite nano-materials modified electrode were prepared and used toacetaminophen by electrochemical method.The results showed that the composite has good electrocatalytic activity,mainly due to the synergistic effect between MWCNTs and MoS₂,and has an good anti-interference,reproducibility as well as stability.