Electrochemical Sensor Based On Carbon Nanomaterial For Determination Of Phenols

Phenols are an important kind of industrial commodity,which are used to synthesize makrolon,ethoxyline resin,phenolic resin,dyestuff,pesticides and thermo-sensitive paper.During the manufacture and employ of phenols,more and more phenols are released into the environment so that it has a bad influence of human body,especially the reproductive system.Therefore,it is very important to develop an accurate,sensitive,fast,wide linearity,good selectivity electrochemical sensor to detect phenols.Carbon nanocomposite has a potential application prospect in fabrication of electrochemical sensor.SEM?BET and FTIR were selected to analyze the prepared polyacrylamide-multiwalled carbon nanotubes?PAM-MWCNTs?and Au nanoparticles?Au Nps?functioned magnetic carbon nanospheres,which were modified on the surface of electrode to detect bisphenol A?BPA?,catechol?CC?and hydroquinol?HQ?.As a result,we fabricated a reliable electrochemical method to test practical sample.The reasons why we adopted the PAM and MWCNTs to detect BPA were high specific surface area and good conductivity.At the same time,PAM contributed to disperse MWCNTs and PAM's flocculation,bridging,surface adsorption and potentiation could increase the amount of amino to immobilize materials so that the sensor was able to make use of MWCNTs.Under the optimal conditions,a linear range was identified from 0.005 to20?mol L^-1 with the detection limit of 1.7 nmol L^-1 and high sensitivity of 3.830?A(?mol L^-1)^-1.Thus,the developed electrochemical sensor has high sensitivity,good selectivity and stability for the quantitative detection of milk samples.Au NPs,Fe₃O₄ and CM were chosen to use as the modified materials of electrode to detect BPA,HQ and CC simultaneously.CM,as uniform size of porous carbon materials,had high specific surface area to adsorb more phenols,thus increase the response of the electrochemical signals.Because Au NPs and Fe₃O₄ had good conductivity and catalysis,the prepared sensor exerted well sensitivity,selectivity,repeatability,accuracy,linear range and detection limit.For BPA,a linear range was identified from 0.02 to 10?mol L^-1with the detection limit of 0.007?mol L^-1 and high sensitivity of 7.509?A(?mol L^-1)^-1.For HQ and CC,a linear range was 5.0-1500?mol L^-1 and 20-1200?mol L^-1 with the detection limit of 1.7?mol L^-1and 6.7?mol L^-1...