Isolation Of Humus And Its Effect On Photoinduced Bromination Of Phenol

The ocean is one of the natural sources of halogenated organic matter.The dissolved organic matter(DOM)in the marine environment has a significant effect on the natural formation process of halogenated organic matter.Among them,humus(HS)is one of the main components of DOM.HS absorbs natural light and plays an important role in the migration and transformation of organic pollutants in water.However,the composition of humus is very complex,and the intrinsic link between its chemical structure and photochemical action is not fully understood in the field of environmental science.Therefore,it recognizes the structure of natural humus which has a significant effect on the photochemical formation of halogenated organic matter,and explores a novel and effective humus separation method.Separation of humus by chemical characteristics such as structure and functional groups,and further study of humic components is very important.In this paper,phenol photochemical formation of bromophenol was selected as the research object.Firstly,sodium sulfonate-2-sulfonate and benzophenone were added as the substitutes of dissolved organic compounds in the reaction solution,and the effect on the photochemical formation of bromophenol was discussed.Then,according to the complex chemical structure of humus,the humus was classified according to the polarity of the molecular structure.Finally,molecular structure was used to separate the humic material from the humus,and the HS grade obtained by different classification methods was studied.The effect of partial phenol photobromination reaction.The main research results are as follows:(1)The presence of sodium sulfonate-2-sulfonate and benzophenone promoted the photochemical formation of bromophenol,and the effect of sodium sulfonate-2-sulfonate on the photochemical formation of bromophenol over benzophenone Larger,indicating that the anthraquinone structure significantly promotes the photobromination reaction;(2)According to the polarity of each component in the humus structure,silica gel chromatography is used to wash the humus with different proportions of ethanol and water mixed solvent as the mobile phase,it is divided into three fractions of FA,FB and Fc with polarity from strong to weak.UV-visible absorption spectroscopy,infrared spectroscopy and fluorescence spectroscopy all showed that the FA fraction contained more aromatic functional groups.The results of studies on the photo-induced bromination of phenol by different polar humic components showed that among the different fractions of humus,the FA component promoted the photo-induced bromination reaction of phenol,followed by FB component and FC component.It can be seen that the substance containing the aromatic structure in the humus is more favorable for promoting the photo-induced bromination reaction of phenol.(3)Molecularly imprinted polymer(MIP)was prepared by using five substances with ruthenium structure,such as emodin,disperse red,disperse blue,reduced blue and reactive brilliant blue,as imprinting molecules.Among them,emodin and disperse red are effective imprinting molecules;Infrared spectroscopy analysis showed that the imprinted molecules and functional monomers in emodin-MIP and disperse red-MIP were bonded by hydrogen bonding,while in other MIPs,there was no hydrogen bond formation between imprinted molecules and functional monomers.(4)Effect of fractions with anthraquinone structure in humus on photoinduced bromination of phenol was studied.The results show that the humic component adsorbed by emodin-MIP promoted the photo-induced bromination reaction of phenol more than the unadsorbed humus fraction and ungraded humus,indicating that emodin-MIP successfully separated the anthraquinone structure material in humus,and the humic substance of anthraquinone structure significantly promoted the photo-induced bromination reaction of phenol.In summary,this paper firstly identified the anthraquinone structure compound to promote phenol photobromination reaction,and then separated the humic fraction with more aromatic structure and anthraquinone structure by polar grading and molecular imprinting,and the promotion of photo-induced bromination reaction by anthraquinone structural components in humus was verified by experiments.The conclusions of the paper provide a reference for further understanding of the intrinsic relationship between humic molecular structure and photochemical action.