Validation of quenching effectiveness and pollutant degradation ability of singlet oxygen through model reaction system

猝灭(荧光) 化学 单线态氧 光化学 乙腈 甲醇 丁醇 氯仿 丙酮 激进的 降级(电信) 氧气 乙醇 有机化学 荧光 电信 物理 量子力学 计算机科学
作者
Limiao Cai,Qian Yao,Xiaodong Du,Jiayi Zhong,Haijian Lu,Xueqin Tao,Jiangmin Zhou,Zhi Dang,Guining Lu
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:460: 132488-132488 被引量:24
标识
DOI:10.1016/j.jhazmat.2023.132488
摘要

Quenching method is widely used to assess the contribution of specified reactive species through the probe inhibition efficiency (IE) caused by adding excessive quencher. However, for reactive species with weak ability such as singlet oxygen (1O2), the quenching results are prone to ambiguity. In this study, an 1O2 system using furfuryl alcohol (FFA) as a probe was successfully constructed by methylene-blue-N vis-photosensitization, to discuss the quenching, interference elimination and pollutant degradation ability of 1O2. Inhibition of FFA transformation caused by both quenching and interrupting of 1O2 production was found. The quenching is affected by quencher dosage and ability, which depends on the second-order-rate constant (k). A high k means a strong ability, and less dosage is required to achieve the same IE. Comparison between the calculated ratio of reactive species consumed by quencher and experimental IE helps to judge the interruption of 1O2 production. None of the organic-solvents (methanol, ethanol, iso-propanol, n-butanol, iso-butanol, tert-butanol, tetrahydrofuran, acetonitrile, acetone and chloroform) scavenged 1O2, which would be used as screening-agent for other reactive species (e.g., hydroxyl radicals) that would interrupt 1O2 contribution assessment. Besides, 1O2 was powerless to degrade most selected pollutants. These results encourage proper use of quenchers and better experimental design.
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