生态环境学报Issue(4)：716-720,5.
腐殖质的光化学降解及其对环境污染物环境行为的影响
Photodegradation of humic substance and its effects on the environmental pollutant behavior
摘要
Abstract
Humic substance is the key organic component, and also one of the main light absorbents in ecosystem, which impacts on the environmental pollutants’ conformation, migration, toxicity and bioavailability significantly. This paper reviews the structure, and photochemical degradation reaction process and mechanism of humic substance. In general, humic substance promotes the photodegradation of pollutants at low concentration, especially with certain iron. However it depresses the photodegradation at high concentration due to the competition of sunlight and reactive oxygen species. Photodegradation of humic substance results in the decrease of molecular weight, aromatic ring and changes of absorbance of ultraviolet and visible region which lead to the lower binding capacity of pollutants and the higher free pollutant concentration. It would be more harmful to the ecosystem. Although it is clear of the mechanism of photodegradation of humic substance and pollutants, more attentions should be paid on the factors of humic substance photodegradation in water and soil system, the mechanism of photosensitive reaction and photodegradation of humic substance, and the relationship between the structure of humic substance and binding capacity of pollutants in the near future. With the increase of stratospheric ozone hole, it enhances the intensity of ultraviolet radiation to the earth's surface. To study the influences of ultraviolet radiation enhancement on the photodegradation of humic substance and pollutants and their impacts on the ecosystem would deep our understandings to the environmental pollutant behavior caused by sunlight radiation.关键词
腐殖质/光化学/结构/污染物/环境行为Key words
humic substance/photochemistry/structure/pollutant/environmental behavior分类
资源环境引用本文复制引用
楼涛,汪学军,何昆鹏,杨臻..腐殖质的光化学降解及其对环境污染物环境行为的影响[J].生态环境学报,2014,(4):716-720,5.基金项目
教育部第47批留学回国人员科研启动基金项目 （）
