Detection Technology Of Chlorobenzene In Water By Molecularly Imprinted Electrochemical Sensor

There are a large number of persistent organic pollutants in the flue gas emitted from metal smelting,among which the typical organic pollutant chlorobenzene has a negative impact on the environment and has a toxic effect on organisms.At the same time,chlorobenzene is also an important precursor for the formation of dioxins in the smelting process,and dioxins are produced by subsequent reactions.At present,timeof-flight mass spectrometry,gas chromatography-mass spectrometry,high performance liquid chromatography and other methods have been used for the detection of chlorobenzene,but they are limited by factors such as complex preprocessing procedures,difficult separation,and high cost.Molecularly imprinted electrochemical sensors can specifically detect target molecules,and have the advantages of simple preparation,good chemical stability,and reusability.In this experiment,a molecularly imprinted electrochemical sensor was prepared to detect chlorobenzene,and the following studies were carried out:(1)Using the mixture of reduced graphene oxide and graphene oxide as the sensitizing material of the sensor,the morphology of the reduced graphene oxide and graphene oxide layer modified on the glassy carbon electrode was characterized by scanning electron microscopy,and the graphite was investigated by cyclic voltammetry.The electrochemical performance of the graphene-modified sensor and the optimal dosage ratio of graphene oxide to reduced graphene oxide were determined.(2)Using the electropolymerization method,the imprinted polymer was modified on the electrochemical sensor,and the imprinting effect of the prepared sensor was verified by cyclic voltammetry and electrochemical impedance method.Through differential pulse voltammetry,the optimal preparation conditions and parameters of the sensor were determined.(3)The chlorobenzene concentration was detected,and the linear correlation equation between the current response signal of the sensor and the concentration of chlorobenzene was established;the influence of interfering substances similar to the molecular structure of chlorobenzene on the sensor was determined.The experimental results show that the prepared molecularly imprinted electrochemical sensor can be used for the detection of chlorobenzene in water.Interfering substances with similar molecular structure to chlorobenzene have little effect on the sensor,and have a good prospect in practical applications.