First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals
	Gao, Hui-Ying; Huang, Chun-Hua; Mao, Li; Shao, Bo; Shao, Jie; Yan, Zhu-Ying; Tang, Miao; Zhu, Ben-Zhan
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2020-11-03
卷号	54 期号:21 页码:14046-14056
ISSN号	0013-936X
英文摘要	Recently, the sulfate radical (SO4(center dot-)) has been found to exhibit broad application prospects in various research fields such as chemical, biomedical, and environmental sciences. It has been suggested that SO4(center dot-) could be transformed into a more reactive hydroxyl radical ((OH)-O-center dot); however, no direct and unequivocal experimental evidence has been reported yet. In this study, using an electron spin resonance (ESR) secondary radical spin-trapping method coupled with the classic spin-trapping agent 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and the typical (OH)-O-center dot-scavenging agent dimethyl sulfoxide (DMSO), we found that (OH)-O-center dot can be produced from three SO4(center dot-) generating systems from weakly acidic (pH = 5.5) to alkaline conditions (optimal at pH = 13.0), while SO4(center dot-) is the predominant radical species at pH < 5.5. A comparative study with three typical (OH)-O-center dot-generating systems strongly supports the above conclusion. This is the first direct and unequivocal ESR spin-trapping evidence for (OH)-O-center dot formation from SO4(center dot-) over a wide pH range, which is of great significance to understand and study the mechanism of many SO4(center dot-)-related reactions and processes. This study also provides an effective and direct method for unequivocally distinguishing (OH)-O-center dot from SO4(center dot-).
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44689]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Gao, Hui-Ying,Huang, Chun-Hua,Mao, Li,et al. First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(21):14046-14056.
APA	Gao, Hui-Ying.,Huang, Chun-Hua.,Mao, Li.,Shao, Bo.,Shao, Jie.,...&Zhu, Ben-Zhan.(2020).First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(21),14046-14056.
MLA	Gao, Hui-Ying,et al."First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.21(2020):14046-14056.