| Organic pollutants are chemical substance that have a long-term Persistent,biological chemicals,low concentration and highly toxic with serious harm to human health and the environment.Dihydroxyhenzene,p-nitrochlorobenzene and P-aminophenol are typical organic pollutants which cause serious pollution to water environment by mass production and extensive use.At present,detection method of hydroquinone,nitrochlorobenzene and p-aminophenol mainly concentrated on chromatography,mass spectrometry and immunoassay analysis,capillary electrophoresis and optical detection.However,the cost is high and the sample pretreatment steps are complex.Electrochemical sensor combined with sensing technology and electrical analysis technology is simple and fast operation,high sensitivity,low detection limit,strong stability,which has become one of the important methods to detect organic pollutants in the environment.This paper using glassy carbon electrode as the basal sensor and design three different electrochemical sensors for electrochemical detection of organic pollutants:（1）The electrochemical sensor based on glassy carbon（GC）electrode was prepared by electrochemical polymerization of L-Arginine（L-Arg）which realized the high sensitivity of hydroquinone for electrochemical sensing analysis.The scanning electron microscopy（SEM）and electrochemical methods were used to characterize it.Under the optimal conditions,the detection range of the three kinds of targets was 0.1 μM110 μM and the correlation coefficient R was 0.9860,0.9880 and 0.9980.The detection limits were 0.01μM,0.03μM and 0.1μM,respectively.The recoveries were 89.5%103% and the relative standard deviation was less than 6.5% in real samples.Compared with existing benzodiazepines electrochemical detection methods,this method for detection Hydroquinone,Catechol and Resorcinol is simple,fast,and easy to operate and the detection limit is much lower.（2）By using wet chemical method of oxidation stripping,the graphene oxide and carbon nanohorn（CNHs/GO）composite materials was prepared successfully,the transmission electron microscopy（TEM）,Raman spectrometer（Raman）,X-ray diffractometer（XRD）and electrochemical methods were used for characterizing.This method shows the high sensitive electrochemical detection of p-nitrochlorobenzene by constructing electrochemical sensor based on CNHs/GO modified electrode.Test results showed that the detection limit is 0.01μM and the linearity range is 0.190 μM.The correlation coefficient R was 0.9826 and the recoveries were 96.5%99.1% in real samples.（3）Through the use of electrostatic synergies between positively charged PDA and negatively charged GO,GO was modified to the PDA / SiO2 surface.After high temperature carbonization,the hydrofluoric acid（HF）was used to etch the SiO2 to obtain graphene（GN）/ nitrogen hollow carbon sphere（NHCS）,and finally the addition of gold nanoparticles（AuNPs）to the surface of GN / NHCS materials to prepare AuNPs / GN / NHCS composites by chemically reductive decorating gold nanoparticle on the graphene warpped hollow carbon microsphere.A new electrochemical sensor was constructed for detection of 4-aminophenol.The oxidation peak current of 4-aminophenol on the AuNPs/GN/NHCS/GC electrode showed superiorty comparing with other electrodes.The detection limit is 0.01μM and the linearity range is 0.1μM40 μM.The correlation R was 0.9989 and the recoveries were 92.5%101.6% in real samples. |
