Study On Process And Mechanism Of Degradation Of Iopromide In Water By UV/FMBC/Sulfite

With the development of public health and healthcare systems,the risk of direct or indirect entry of drugs and iodized contrast media（ICMs）used for medical examination of organ imaging into water has increased rapidly and can be detected in all types of water environments.ICMs are difficult to be removed by conventional wastewater treatment because of their high polarity and good biological stability.Although ICMs are not toxic,many conversion products can be formed during water treatment,which are toxic.Conventional wastewater treatment process can not effectively remove these transformed products,which will pose great ecological and health risks to aquatic organisms and human health.ICMs and transformed products are of great concern and need efficient and environmentally friendly ways to remove or degrade them.Therefore,in this paper,iopromide（IOP）,the most commonly used ICMs,was selected as the research object,and photochemical transformation method was used to carry out experimental research,trying to find an efficient and friendly degradation pathway.The advanced oxidation technology based on sulfate free radical(SO₄^·-)is fast,efficient and has a wide range of application,which has attracted wide attention in the removal of emerging pollutants in water.Because of its large specific surface area and rich functional groups,ferromagnetic biochar can activate sulfite to produce sulfate free radical to degrade pollutants,which can effectively enhance the degradation performance of pollutants.Increase the degradation rate.At the same time,the large surface area of ferromagnetic biochar is beneficial to the formation of activated free radicals and increase the number of activated free radicals under light conditions.Under the synergistic action of light,the degradation of IOP can be better promoted.In this paper,iodopropylamine in aqueous solution was degraded by activating sulfite with ferromagnetic biochar under xenon lamp illumination.The photochemical transformation mechanism of IOP degradation by this method was studied,and the related influencing factors such as initial concentration of substrate,initial p H value,different types of modified biochar,initial concentration of sulfite,dosage of ferromagnetic biochar,light intensity,dissolved oxygen,anion in water,hydroxyl radical（·OH）in the system,SO₄^·-were explored.The photochemical transformation products of IOP were analyzed,and the degradation effect and photochemical transformation mechanism of IOP were investigated.This paper explores a new method of photochemical conversion of iodopropylamine in order to better solve the environmental pollution problem of how to degrade iodopropylamine pollution in water environment,and to provide a basis for iodopropylamine environmental restoration project,which has certain practical significance.