The Application Of Graphene Electrochemical Sensor In Detection Of OPs And Phenolic

Electrochemical sensor is widely used in many field,which owe to its high sensitivity,simple operation,rapid deteimination,miniaturization,automation.With the rapid development of material science,many nano materials such as graphene is used to construct electrochemical sensor.The study construct 3 electrochemical sensor:GN-CS/GCE?GN-CS-CD/GCE?GN-CS-Gu/GCE.They are used to detect methyl parathion(MP),phoxim and bisphenol A(BPA),respectively.The main results were as follows:(1)The study explore electrochemical behavior of MP on the surface of GN-CS/GCE.The results show that,there are a pair of reversible REDOX(-0.002 V,-0.013V)and a irreversible reduction peaks peak(-0.513V).Comparing with GCE,GN-CS/GCE has strong adsorption to MP,can accelerate the electron transfer and enhance current signal.Under the best conditions,Ipa(?A),the oxidation peak current of MP,is concentration with C(?g/mL)within the scope of 0.01~4.0?g/mL,the linear equation is Ipa=-3.5646C-1.1467(R2=0.996),the detection limit is 2.7 ng/mL(S/N=3).It apply to analysis samples successfully,standard addition recovery is95.1%~102.5%,it has good reproducibility and stability.(2)The study explore electrochemical behavior of phoxim on the surface of GN-CS-CD/GCE.The results show that,there is a irreversible reduction peaks peak(-0.78V).Comparing with GCE,GN-CS-CD makes peak of potential move toward positive and makes peak value of current increase.Under the best conditions,Ipc(?A),the reducing peak current of phoxim,is concentration with C(?g/mL)within the scope of 0.016 ~ 0.128 and 0.128~ 8?g /mL,the linear equation is Ipc=1.3322C+1.5479(R2 = 0.994)and Ipc=0.6167C+2.8648(R2 = 0.998),the detection limit is 4.4 ng/mL(S/N = 3).(3)By detecting two different types of organophosphorus pesticide,MP and phoxim,it found that the different structure material in the same class,show different Electrochemical behavior on the same electrode;The same kind of decoration materials show different electrochemical response to OPs.So modified material selection have a certain relationship with he structure of the target compounds,the same decoration materials have universal applicability for the same material.(4)The study explore electrochemical behavior of BPA on the surface of GN-CS-Cu/GCE.The results show that,there is a irreversible reduction peaks peak(0.452V).Comparing with GCE,GN-CS-CD makes peak value of current increase.Under the best conditions,the reducing peak current of phoxim,is concentration with C within the scope of 0.1~5 ?mol/L and 5~250 ?mol/L,the linear equation is Ipa=-0.9582C-0.2286(R2=0.999)and Ipa=-0.075C-4.6067(R2 =0.996),the detection limit is 0.066 ?mol/L(S/N=3).The electrochemical sensor has wide linear range,prepare simply pretreatment simply,low cost,less time consuming,the advantages of high sensitivity,good stability,can be used for the determination of actual samples.In summary,Graphene has many advantages,such as unique 2d nanostructures,large specific surface area,good thermal stability,fast electron transfer rate,superior mechanical properties.Using ultrasonic mixing method,we get good compound with CS,CD and Cu nanoparticles.The compound have good electrical conductivity,object function of molecular recognition,good mixture,stability and dispersion.We constructed different target corresponding electrochemical sensor with this copound,and detect MP,phoxim and BPA rapidly.The study have important scientific significance and practical significance on the detection of OPs and BPA pollution.