Research Of Ferrous Sulfide Catalyzed Degradation Of Iopromide By Sulfite

ICM is a drug which is used widely in blood vessels during the diagnosis process and be used to enhance the imaging of human organs,blood vessels and soft tissues.According to investigations,the presence of ICM can be detected frequently in the effluent and surface water of the sewage treatment plant.In recent years,ICM has been found to be a precursor to iodide disinfection byproducts and has received more and more attention.Studies have shown that ICM is a major source of iodine during the formation of iodo trihalomethanes?iodo-THM?and iodic acid disinfection by-products?iodo-acids?.These two classes of substances have high genotoxicity and cytotoxicity to mammals.Therefore,the metabolites or transformation products of ICM in the environment are likely to cause harm to the ecological environment and human health.This has caused people to attach great importance to it.The degradation technology of iodinated contrast agents has become a hot topic for scholars at home and abroad.In this paper,a common iodinated contrast agent iopromide was selected as the research object.In this experiment,the iodide treatment in aqueous solution was degraded using ferrous sulfide catalyzed sulfite.Both of these materials were cheap,easy to obtain,safe and non-hazardous,and had good economic benefits in practical applications.In this paper,the degradation mechanism of iopromide degradation by this method was studied and the effect of practical application was tested.Influencing factors affecting the oxidative degradation of iopromide(substrate concentration,pH,sulfite concentration,ferrous sulfide dosage,hydroxyl radical?HO^·?,sulfate radical(SO₄^·-),dissolution Oxygen,sulfite ion(SO₃^2-),salts),and analysis of the product of oxidative degradation of iopromide in aqueous solution,inferring the oxidative degradation process.The concentration of total organic carbon in the aqueous solution after the reaction was measured to determine the treatment effect of the organic pollutant iopromide in the practical application of the technology.According to the experimental results,I got the conclusions:In aqueous solution,iopromide was capable of oxidative degradation,and the oxidative degradation process of iopromide conforms to the pseudo-first-order kinetics.The optimum initial pH value of the reaction system was 8.When the pH value was greater than 8,the degradation of iopromide was inhibited;the optimum dosage of ferrous sulfide was 1 g L^-1,and the excess ferrous sulfide inhibited iodopro Degradation of amine;the optimum initial concentration of sulfite was 400?M.Excess sulfite would have inhibited the degradation of iopromide;NO₃^-had little effect on the oxidative degradation of iopromide;a small amount of Cl^-would be slightly promoted the oxidative degradation of iopromide;CO₃^2-inhibited the oxidative degradation of iopromide;the main role of the oxidative free radical in the reaction system was SO₄^·--;only Fe?II?species participated in the activation mechanism of sulfite in our study.The conclusions of this paper can provide a new and cost-effective method for oxidative degradation of iopromide,as well as the understanding of the oxidative degradation pathway of iopromide,and also provide a theoretical basis for the practical application of iopromide in degraded water environment.