Preparation Of Several Carbon Nanocomposites And Their Application In Electrochemical Sensing For Phenols

The chemical sensor has been widely applied in manufacture industry,food security,environment monitor,medicine development,disease diagnosis,security defense,aerospace research and so on.Up to now,many methods such as capillary electrophoresis,gas chromatography-mass spectrometry,spectroscopy,HPLC,spectra and electrochemical method have been developed for quantify of analyst.Among them,the electrochemical sensor,which is based on the determination of electroactive substances in solution with the form of output electrochemical signal has attracted much attention for its high sensitivity,low cost,simple operation and rapid analysis.Carbon nanomaterials,one of the most important research substances,are widely used in electrochemical sensors.They are recently received considerable interest for low cost,stability,small background interference,wide potential window and great electrocatalytic performance.Via chemical and physical modification,the properties of carbon nanomaterials can be improved and optimized.Phenols and their derivatives are aromatic organic compounds and are harmful to the organisms.Therefore,it is of great significance for quantification of phenols.In this thesis,after summarizing the electrochemical sensors and detection of phenols,we have synthesized several carbon nanocomposites and fabricated some electrochemical platforms for phenols determination.The main work is as follows:1.A new electroactive ferrocene derivative polymer nanospheres(FPS)was synthesized via a facile and self-assembly method in methanol.Based on the electroactive property of FPS,a new electrochemical sensor for acetaminophen(AP)with the nanocomposite of multi-walled carbon nanotubes-ploydiallyldimethylammoniumchloride-FPS(MWCNT-PDDA-FPS)was firstly developed.The greatly enhanced electrochemical performance towards AP determination can be obtained owing to the electrocatalysis of electroactive FPS and good conductivity of MWCNT.The AP sensor exhibits a wide sensing linear range and low detection limit.Excellent recovery and low RSD can be realized in human urine samples by this proposed method.2.A facile one-pot method for preparing AuPd bimetallic incorporated carboxylic multi-walled carbon nanotubes(MWNTs-PDDA-AuPd)was developed.The as-prepared MWNTs-PDDA-AuPd shows enhanced electrocatalytic performance toward bisphenol A.With this novel sensor,the oxidation peak currents of BPA were linearly dependent on the BPA concentrations in the range of 0.18 μM-18 μM with the detection limit of 0.06 μM.In addition,the proposed electrochemical method was successfully applied for the detection of bisphenol A in milk and water samples.3.Au-Pd reduced graphene oxide(Au-Pd NF/rGO)was prepared by the electrochemical co-reduction deposition method via cyclic voltammetry(CV).Owing to the integrated superior conductivity and excellent catalytic property of Au-Pd/rGO,the sensitive and simultaneous detection of HQ,CC and RC was realized in the individual or triple-components samples,which shows wide linear range and low detection limit.The detection of them in tap water,river water and lake water were also successfully performed.