Optical properties and photochemical production of hydroxyl radical and singlet oxygen after ozonation of dissolved organic matter
Optical properties and photochemical production of hydroxyl radical and singlet oxygen after ozonation of dissolved organic matter
复制标题
溶解性有机物臭氧化后的光学性质及羟基自由基和单线态氧的光化学产生
DOI：
10.1039/d0ew00878h
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发表时间：
2021-02-01
影响因子：
5
通讯作者：
Rosario-Ortiz, Fernando L.
中科院分区：
文献类型：
--
作者：
Leresche, Frank;Torres-Ruiz, Jeremy A.;Rosario-Ortiz, Fernando L.
研究了臭氧氧化对溶解性有机物（DOM）光学和光化学性质的影响。臭氧氧化后，DOM的光吸收性能下降，同时单线态氧（O-1（2））和羟基自由基（OH）量子产率（分别为phi O-1（2）和phi（OH））大幅增加。吸光度的降低与DOM发色团与臭氧和作为次级氧化剂形成的OH的反应有关，而phi O-1（2）和phi（OH）的增加与臭氧与酚DOM部分反应形成醌样部分有关。使用苯甲酸作为OH探针和甲醇作为OH清除剂的调查表明，不仅OH形成，但其他羟基化物种（OH样）也产生DOM光照射后。
This study focuses on the effects of ozonation on the optical and photochemical properties of dissolved organic matter (DOM). Upon ozonation, a decrease in light absorption properties of DOM was observed concomitantly with a large increase in singlet oxygen (O-1(2)) and hydroxyl radical (OH) quantum yields (phi O-1(2) and phi(OH), respectively). The decrease in absorbance was linked to the reaction of DOM chromophores with ozone and OH, formed as a secondary oxidant, while the increase in phi O-1(2) and phi(OH) are linked to the formation of quinone-like moieties from the reaction of ozone with phenolic DOM moieties. Investigations using benzoic acid as a OH probe and methanol as a OH scavenger indicated that not only is OH formed, but that other hydroxylating species (OH-like) are also produced upon DOM photo-irradiation.