Electrochemical Detection Of Sudan Red And Electrochemistry Induced Polymerization Of Styrene

In a wide range of applications for detecting and analysis of chemical and biological materials,electrochemical methods have a number of advantages including ease in operation,low cost,high sensitivity,portability,weak background interference and time saving.A variety of electrochemical techniques provide various electrochemical analysis application methods.The combination of nanomaterials with electrochemistry improves the electrochemical properties of electrode significantly achieving better sensitivity and selectivity in detection and higher efficiency in polymerization.In this paper we modified the indium-tin oxide(ITO)electrode with polythionine and mesoporous silicon nanoparticles,added SiO2 nanoparticles in solution,respectively.Differential pulse voltammetry,cyclic voltammetry,amperometric i-t curve and other electrochemical methods were employed in the detection of sudan I and its analogues and in a preliminary study of electrochemical generation of methyl viologen radical to polymerize styrene.The ITO electrodes were modified with polythionine by electrochemical polymerization and mesoporous silicon nanoparticles,polyvinyl alcohol(PVA)using self-assemble technique.The optional condition of modification with polythionine,mesoporous silicon nanoparticles and PVA was studied.Polythionine can enhance the electron transport on the electrode surface.The modification of mesoporous silicon nanoparticles can cause the enrichment of sudan I in the solution.Their combination can improve the sensitivity of the electrochemical detection.The modification of PVA fixes the modification materials on the electrode surface making the electrode stable and repeatable.The recovery rate of sudan I using this modified electrode is between 90% and 108%.Four sudan analogues can be distinguished by the redox potential.With the experiments conducted by combining electrochemical methods and UV spectrophotometer,SiO2 nanoparticles was chosen from seven nanomaterials including graphene,carbon nanotubes and others due to its best stability and dispersity for methyl viologen radical.The experiment of generating radical polymerize styrene using electrochemical method was also optimized.Under the condition of 0.1 M methyl viologen,190 mg oleate,the ratio of water/ styrene is 2.5,80°C,the highest conversion rate reached 12.6%.This research lays foundation for green electrochemical production of polymer materials in the future.