Electrochemical Research And Determination Of Organic Dyes

The emission of organic dyes directly harms the environment.Bioconcentration also poses a threat to human health.Therefore,the determination of organic dyes is of great significance in the fields of environment and safety.Some azo dyes and anthraquinone dyes will cause allergies,vomiting and even cancer.In this paper,poly L-arginine/graphene modified glassy carbon electrode?PLA-ERGO/GCE?was prepared by cyclic voltammetry?CV?.The properties of the modified electrode were studied.The alizarin,alizarin red and chrome blue SE were explored.A new method for the determination of alizarin,alizarin red and chrome blue SE was established by the electrochemical behavior of poly-L-arginine/graphene modified electrode?PLA-ERGO/GCE?.During the whole experimental research process,the main problems solved are:?1?Preparation of poly L-arginine/graphene modified electrode?PLA-ERGO/GCE?by cyclic voltammetry and characterizing it;?2?Exploring alizarin in poly L-Electrochemical behavior on arginine/graphene modified electrode?PLA-ERGO/GCE?;?3?Exploring the electricity of alizarin red on poly-L-arginine/graphene modified electrode?PLA-ERGO/GCE?Chemical behavior;?4?Exploring the electrochemical behavior of chrome blue SE on a poly-L-arginine/graphene modified electrode?PLA-ERGO/GCE?.The main research contents are as follows:1.Poly L-arginine/graphene modified electrode?PLA-ERGO/GCE?was prepared by cyclic voltammetry in a mixture of L-arginine?LA?and graphene?GO?.The electrodes were characterized using scanning electron microscopy?SEM?and alternating current impedance mode?EIS?.2.Study the electrochemical behavior of alizarin on poly L-arginine/graphene modified electrode.Cyclic voltammetry scanning was performed at a potential range of-0.4¹.0V with a scanning speed of 160 mV/s and a waiting time of 200 s.The alizarin has a good linear relationship with the peak current in the concentration range of 5.00×10^-71.00×10^-4 mol/L,and the detection limit is 1.7×10^-7 mol/L.In the potential range of-0.6¹.2 V,the waiting time is 200 s,and the differential pulse voltammetry scan is performed.The alizarin has a good linear relationship with the peak current in the concentration range of 2.50×10^-71.00×10^-4 mol/L..The detection limit was 8.0×10^-8mol/L.It is used for the detection of alizarin in dye wastewater and the results are satisfactory.3.The electrochemical properties of alizarin red were studied by cyclic voltammetry and differential pulse voltammetry?DPV?.The experimental results show that the alizarin red has a linear relationship with the peak current in the concentration range of5.00×10^-72.50×10^-5 mol/L and 5.00×10^-55.00×10^-4 mol/L.The detection limit is 1.0×10^-8 mol/L.It is used to detect alizarin red in dye wastewater and the results are satisfactory.4.The electrochemical behavior of chrome blue SE was investigated by cyclic voltammetry on PLA-ERGO/GCE modified electrode.When the potential range is0.5¹.0 V,the scanning speed is 180mV/s,and the waiting time is 90 s,the chrome blue SE concentration is in the range of 4.00×10^-62.00×10^-4 mol/L,and the oxidation peak is good.The linear relationship was found to be 2.5×10^-7 mol/L.This method is satisfactory for the detection of chrome blue SE in dye wastewater.