Accelerated Indirect Photodegradation of Organic Pollutants at the Soil–Water Interface

光降解 污染物 环境化学 环境科学 土壤污染物 水污染物 化学 土壤水分 土壤污染 光催化 土壤科学 有机化学 催化作用
作者
Binbin Wu,Jingyi Wang,Xingyi He,Hengyi Dai,Xiaoshan Zheng,Junye Ma,Yu Yao,Dantong Liu,Wanchao Yu,Baoliang Chen,Chiheng Chu
出处
期刊:Environmental Science & Technology [American Chemical Society]
标识
DOI:10.1021/acs.est.4c06993
摘要

Indirect photolysis driven by photochemically produced reactive intermediates (PPRIs) is pivotal for the transformations and fates of pollutants in nature. While well-studied in bulk water, indirect photolysis processes at environmental interfaces remain largely unexplored. This study reveals a significant acceleration of indirect photodegradation of organic pollutants at the soil–water interface of wetlands. Organic pollutants experienced ubiquitously enhanced indirect photodegradation at the soil–water interfaces, with rates 1.41 ± 0.01 to 4.27 ± 0.03-fold higher than those in bulk water. This enhancement was observed across various natural and artificial wetlands, including coastal wetlands and rice paddies. In situ mapping indicated that soil–water interfaces act as hotspots, concentrating both organic pollutants and PPRIs by 9.30- and 4.27-folds, respectively. This synchronized colocation is the primary cause of the accelerated pollutant photolysis. Additionally, the contribution of each PPRI species to pollutant photolysis and a coupled transformation pathway at the soil–water interface significantly differed from those in bulk water. For instance, the contribution of singlet oxygen to metoxuron photolysis increased from 10.1% in bulk water to 44.4% at the soil–water interface. Our study highlights the rapid indirect photolysis of organic pollutants at the soil–water interfaces, offering new insights into the natural purification processes in wetlands as "Earth's kidneys."

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