The Synthesis Of Graphene-platinum Nanoparticle Hybrids And The Electrochemical Determination Of Bisphenol A And N-nitrosamine

With the development of economy,more and more pollutants enter the environment.Among them,the phenol pollutants and the nitrosamines are the small molecule organic pollutants which can cause cancer.Traditional detection methods(HPLC,GC,GC-MS,LC-MS,etc.)have the advantages of precision and automation,but they often require complex sample pretreatment.Electrochemical sensors,with the advantages of simple operation,short time,low cost,high sensitivity,can overcome the above shortcomings,which has been widely used in the detection of environmental pollutants.Graphene has been widely used in electrochemical sensor since it was discovered in 2004.In this paper,electrochemical sensors for the detection of bisphenol A and N-nitrosodiphenylamine was constructed based on graphene-platinum hybrid materials.The main contents of this paper are as follows:(1)Electrochemical sensor for facile detection of trace bisphenol A based on cyclodextrin functionalized graphene/platinum nanoparticles.In this study,heptakis-(2,3,6-tri-O-methyl)-?-cyclodextrin functionalized graphene/platinum nanoparticles(TM-?-CD-Gr/PtNPs)were successfully synthesized by a simple wet-chemical strategy.The new nanocomposite possesses the excellent properties of Gr/PtNPs(large surface areas,high conductivity and excellent electrocatalytic activity)and the unique properties of cyclodextrin(host-gest supramolecular recognition and enrichment capability).It exhibits remarkable synergistic effect on the electrochemical reaction of BPA.Based on the above properties,a highly sensitive electrochemical sensor was developed to detect BPA.The oxidation peak current of BPA can be greatly enhanced at the TM-?-CD-Gr/PtNPs modified glassy carbon electrode(TM-?-CD-Gr/Pt NPs/GCE)compared with the Gr/PtNPs/GCE and the TM-?-CD-Gr/GCE.Under the optimum condition,the peak currents of BPA increased linearly with BPA concentrations in the range of 5.0×10-8-8.0×10-5 mol L-1.The detection limit is 1.5×10-8 mol L-1(S/N=3).This sensor is cost-effective and convenient,which shows great potential in the detection of trace amounts of phenol compounds in environmental pollutants.(2)Electrochemical sensor for facile detection of trace N-nitrosodiphenylamine based on poly(diallyldimethylammonium chloride)stabilized graphene/platinum nanoparticles.In this study,poly(diallyldimethylammonium chloride)stabilized graphene/platinum nanoparticles(PDDA-Gr/PtNPs)were successfully synthesized by a simple wet-chemical strategy.The new nanocomposite possesses the excellent properties of Gr/PtNPs(large surface areas,high conductivity and excellent electrocatalytic activity).It exhibits remarkable synergistic effect on the electrochemical reaction of NDPhA.Based on the above properties,a highly sensitive electrochemical sensor was developed to detect NDPhA.The oxidation peak current of NDPhA can be greatly enhanced at the PDDA-Gr/PtNPs modified glassy carbon electrode(PDDA-Gr/PtNPs/GCE)compared with the bare GCE and the PDDA-Gr/GCE.Under the optimum condition,the peak currents of NDPhA increased linearly with its concentrations in the range of 1.0×10-7-5.0×10-5 mol L-1.The detection limit is 3.3×10-8 mol L-1(S/N=3).This sensor is cost-effective and convenient,which shows great potential in the detection of trace amounts of nitrosamines compounds in environmental pollutants.(3)In this part,summarized the work of this paper and pointed out the existing deficiencies of the current job and proposed some solutions.Finally,the prospect of electrochemical sensors application in the detection of the environmental pollutants is discussed.