标题：Contribution of the Excited Triplet State of Humic Acid and Superoxide Radical Anion to Generation and Elimination of Phenoxyl Radical

作者： Chen, Y (Chen, Yuan); Zhang, X (Zhang, Xu); Feng, SX (Feng, Shixiang)

来源出版物：ENVIRONMENTAL SCIENCE & TECHNOLOGY 卷：52 期：15 页码:   8283-8291 DOI：10.1021/acs.est.8b00890       出版年： AUG 7 2018

摘要：Contributions of excited triplet state of humic acid ((3)HA*) and superoxide radical anion (O-2(center dot-)), which is mainly generated via the reaction of O-2 with HA-derived reducing intermediates (HA(center dot-)), to phenol transformation were revealed using acetaminophen, 2,4,6-trimethylphenol and tyrosine as probe molecules. Phenol transformation was initiated by (3)HA*, leading to the formation of the phenoxyl radical (PhO center dot), but the distribution of transformation intermediates was codetermined by (3)HA* and HA(center dot-). The influence of HA(center dot-) essentially resulted from the production of O-2(center dot-), which affected the fate of PhO center dot. PhO center dot could undergo dimerization, or react with O-2(center dot-), leading to either phenol peroxide formation (radical addition) or phenol regeneration (electron transfer). In addition, PhO center dot could bind to HA or react with HA radicals, particularly in the absence of O-2 and O-2(center dot-). These PhO center dot reactions were dependent on the reduction potential and structure of PhO center dot. This study also proved that the reaction of phenol with O-1(2) and the reaction of PhO center dot with O-2(center dot-) lead to the same oxidation product. The contributions of (3)HA* and its generated O-1(2) , HA(center dot-) and its generated O-2(center dot-) to phenol transformation were pH-dependent.

入藏号：WOS:000441477600026

文献类型：Article

语种：English

扩展关键词： DISSOLVED ORGANIC-MATTER; CHARGE-TRANSFER INTERACTIONS; SINGLET OXYGEN; HYDROGEN-PEROXIDE; OPTICAL-PROPERTIES; QUANTUM YIELDS; PHOTOSENSITIZED DEGRADATION; REACTION-MECHANISMS; AQUEOUS-SOLUTIONS; AROMATIC KETONES

通讯作者地址： Zhang, X (reprint author), Wuhan Univ, Dept Environm Sci, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

电子邮件地址：xuzhangwhu@gmail.com

地址：[Chen, Yuan; Zhang, Xu; Feng, Shixiang] Wuhan Univ, Dept Environm Sci, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

影响因子：6.653