Application Of Tetrabromobisphenol A Electrochemical Sensor Based On Functional Carbon Nanotubes

Tetrabromobisphenol A(TBBPA)is one of the most commonly used brominated flame retardants in China.Now,it exists not only in some places of lakes,river sediments,but also in human biological samples such as blood,breast milk.TBBPA is persistent and accumulative in the environment.Many animal experiments show that TBBPA has immunotoxicity,cytotoxicity,endocrine toxicity,developmental toxicity.At the same time,it potentially disruptes human’s endocrinesystem.While the chromatography and immunization method is expensive,and cumbersome step.It is imminent to establish trace detection method concerning about tetrabromobisphenol A.In this study,electrochemical method was used to monitor the level of TBBPA in water environment.PartΙ:Application of Au modified multiwalled carbon nanotubes onelectrochemical detection of tetrabromobisphenol AObjective:MWCNT-Au nanomaterials were prepared and used to construct an electrochemical sensor for rapid detection of tetrabromobisphenol A in environmental water samples.Methods:We construct an electrochemical sensor of tetrabromobisphenol A byMWCNT-Au nanomaterials and octadecyltrimethylammonium bromide.The first mentioned of two is as conductive element modified glassy carbon electrode,based on which octadecyltrimethylammonium bromide(DODMA)was for further modification.Results:According to TEM,Au nanoparticles were sucessfully modified on MWCNT.As depected in EIS spectra,GCE/DODMA/MWCNT-Au was the best,which can effectively enhance the adsorption effect and electrochemical response of TBBPA.On the surface of DODMA/MWCNT-Au/GCE,TBBPA had the largest oxidation peak and the chemical reaction is irreversible.In concentration range of 0.01μM-1.0μM,I_p=5.47855 C-0.05125(R=0.997),the detection limit was 0.0034μM(S/N=3),and the oxidation peak potential of TBBPA was E_p=0.655 V.The recoveries of the method was 95.3%-102.0%and the RSD was 2.1%-4.2%,which was consistent with the results of chromatography.Conclusions:The addition of DODMA can enhance the adsorption of TBBPA.The chemical sensor with DODMA/MWCNT-Au was highly sensitive and could be used in the detection of TBBPA in environmental water.Part Ⅱ: Application of Fe3O4 modified multiwalled carbon nanotubes on electrochemical detection of tetrabromobisphenol AObjective: On the basis of synthesis of MWCNT-Fe3O4 nanomaterials,BMMIBF4 was added to construct an electrochemical sensor.It could be used in trace detection of tetrabromobisphenol A in water samples.Methods: On the basis of Fe3O4 modified multiwalled carbon nanotubes,1-benzyl-3-methylimidazolium tetrafluoroborate,a kind of ionic liquid,was used to form an electrochemical sensor,and test TBBPA level of water sample.In this study,the electrode composition conditions and detection conditions were investigated,and the relationship between TBBPA concentration and oxidation peak current was studied.Finally,the morphology between the layers of the composite electrode was characterized by SEM and EIS,and the change of electrode layers and the electrode response characteristics of TBBPA were characterized by CV and EIS.Results: As depectied in SEM,Fe3O4 nanoparticles is sucessfully modifed on GCE.EIS spectra indicated that BMMIBF4/MWCNT-Fe3O4/GCE is excellent,and can effectively enhance the adsorption effect and electrochemical response of TBBPA.The oxidation peak of TBBPA on BMMIBF4/MWCNT-Fe3O4 is the largest,and the chemical reaction on the electrode surface is irreversible.When the enrichment time was 5minutes,the oxidation peak potential of TBBPA was Ep = 0.655 V.The linear range is0.01 μM-0.5 μM,Ip = 33.7233 C-0.4640,R = 0.999,and the detection limit was0.0025 μM(S/N = 3).The method presented stable sexuality and reproducibility.The recoveries of the two methods were 96.7%-102.8% and the RSD was 2.8%-3.8%.The results obtained by electrochemical method were in a good agreement with HPLC method.Conclusions: The addition of BMMIBF4 enhanced the adsorption of TBBPA.The chemical sensor with MWCNT-Fe3O4 has high sensitivity and accuracy,which is suitable for the trace detection of TBBPA.