化学
羟基化
氢氧化物
腐植酸
羟基自由基
反应性(心理学)
光降解
激进的
光化学
猝灭(荧光)
过氧化氢
反应中间体
活性氧
吸附
无机化学
有机化学
光催化
催化作用
生物化学
物理
量子力学
肥料
医学
替代医学
荧光
酶
病理
作者
Xinghao Wang,Lirong Pu,Cun Liu,Juan Gao,Cheng Gu
出处
期刊:Water Research
[Elsevier]
日期:2021-04-01
卷期号:193: 116904-116904
被引量:6
标识
DOI:10.1016/j.watres.2021.116904
摘要
Mineral-humic complexes, known as mineral-associated organic matter (MAOM), are ubiquitous in natural waters. However, the interaction between organic pollutants and MAOM remains elusive, which may affect their degradation process. In this study, photochemical transformation of chlorophene (CP) in the presence of MAOM, prepared by coating aluminum hydroxide with humic acid (HA-HAO), was investigated. Our results showed that the degradation of CP was significantly enhanced in the presence of HA-HAO, and the degradation rate constant was ~5 times as that with HA only. It was because the adsorption of CP to HA-HAO particles was greatly enhanced, and concentration of reactive oxygen species (ROS) was increased on HA-HAO surfaces, which further promoted the reactions between CP and ROS. The quenching experiments combined with EPR technology confirmed that superoxide anion (O2·–) was the primary reactive radical on CP photodegradation. More importantly, the degradation of CP with HA-HAO followed a hydroxylation process, rather than the oligomerization reaction with HA only. Spectroscopic analysis provided direct evidence for the formation of hydrogen bonding between CP phenolic hydroxyl group and surface oxygen of HAO, which would suppress the reactivity of phenolic hydroxyl group, consequently the ortho- and meta-positions of CP became more facile for the hydroxylation reaction. This study shows the importance of MAOM in altering the photochemical behavior and transformation pathway of organic contaminants.
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