Research progress on photodegradation behavior of emerging pollutants in water containing dissolved organic matter
Emerging contaminants(ECs)are a class of environmental pollutants with high stability and hydrophilicity,most of which eventually enter and remain in natural waters.They have received increasing attention for its harm to ecological and human health.Photochemical degradation is one of the main transformation processes of ECs in water,including direct photodegradation,indirect photodegradation and self-sensitized photodegradation.As a photosensitizer with excellent photochemical properties,dissolved organic matter(DOM)produces active reaction intermediates such as·OH,1O2,and 3DOM*after light absorption,which has an important influence on the indirect photodegradation process of ECs.In order to explore the migration and transformation of ECs in water and assess their ecological risks,it is necessary to improve the understanding of their degradation process.In view of this,on the basis of discussing the environmental photochemical characteristics and processes of DOM,this paper focused on the effects of types,sources,fluorescent components of DOM and environmental factors on the photodegradation process of ECs.Influence of DOM on the photodegradation process of ECs mainly includes promoting effect and inhibiting effect.The promoting effect is mainly manifested in the reaction of active reaction intermediates generated by DOM with ECs.However,the inhibition effect mainly includes light shielding effect and quenching effect.The effect of DOM on the photodegradation of ECs was closely related to type,source,composition and environmental factors of DOM.Meanwhile,the future research work on the effect of DOM on the photodegradation of ECs was prospected.This will contribute to a more comprehensive understanding of the photochemical behaviour of ECs,which is of importance for assessing the environmental fate and ecological risk of ECs in natural waters.
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