瞬态自由基与污染物的液相快速反应动力学

doi:10.3866/PKU.DXHX202204047

大学化学 >> 2023, Vol. 38 >> Issue (2): 163-169.doi: 10.3866/PKU.DXHX202204047

瞬态自由基与污染物的液相快速反应动力学

冯慧娟, 童鑫, 王黎明()

华南理工大学化学与化工学院, 广州 510640

收稿日期:2022-04-14 录用日期:2022-05-16 发布日期:2022-05-24
通讯作者: 王黎明 E-mail:wanglm@scut.edu.cn
基金资助:
国家自然科学基金(21677051)

Rapid Reaction Kinetics of Transient Free Radicals with Pollutants in Aqueous Phase

Huijuan Feng, Xin Tong, Liming Wang()

School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Received:2022-04-14 Accepted:2022-05-16 Published:2022-05-24
Contact: Liming Wang E-mail:wanglm@scut.edu.cn

摘要/Abstract

摘要：

介绍了一种测量瞬态自由基快速液相反应速率系数的方法。采用激光脉冲光解产生瞬态自由基，采用吸收光谱法测量从微秒到毫秒时间尺度内的瞬态自由基浓度变化，采用绝对速率法和相对速率法得到反应的二级速率系数。本实验可加深对反应动力学的理解，并引导学生在有机污染物环境光化学方面开展创新性研究。

关键词: 瞬态吸收光谱, 激光闪光光解, 碳酸根离子自由基, 羟基自由基

Abstract:

This experiment introduces a method to measure the rate coefficient for the rapid reactions of transient free radicals with pollutants in an aqueous phase. Transient free radicals are generated via laser pulse photolysis and are detected using transient absorption spectroscopy. Second-order rate coefficients are obtained through the absolute rate method or relative rate method. In addition to a thorough understanding of chemical kinetics, this experiment will introduce students to innovative research in the field of environmental photochemistry of pollutants.

Key words: Transient absorption spectroscopy, Laser flash photolysis, Carbonate radical anion, Hydroxyl radical

冯慧娟, 童鑫, 王黎明. 瞬态自由基与污染物的液相快速反应动力学[J]. 大学化学, 2023, 38(2): 163-169.

Huijuan Feng, Xin Tong, Liming Wang. Rapid Reaction Kinetics of Transient Free Radicals with Pollutants in Aqueous Phase[J]. University Chemistry, 2023, 38(2): 163-169.

链接本文: https://www.dxhx.pku.edu.cn/CN/10.3866/PKU.DXHX202204047

https://www.dxhx.pku.edu.cn/CN/Y2023/V38/I2/163

图/表 5

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表2

[HCQ]/(μmol∙L⁻¹)	0	18.4	36.7	55.0	64.1
k_1st/(10⁴ s⁻¹)	1.19 ± 0.01	1.30 ± 0.02	1.43 ± 0.03	1.56 ± 0.05	1.61 ± 0.06

[Syr]/(μmol∙L⁻¹)	0	33.1	65.8	98.2	130.0	162.0
($ {{A}}_{{\text{[}{\text{(SCN)}}_{\text{2}}^{\text{•}\text{-}}\text{]}}_{{x}}} $)	0.288	0.125	0.078	0.055	0.040	0.032
($ {{A}}_{{\text{[}{\text{(SCN)}}_{\text{2}}^{\text{•}\text{-}}\text{]}}_{{x}}} $)_Corr	–	0.252	0.236	0.223	0.201	0.188

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瞬态自由基与污染物的液相快速反应动力学

Rapid Reaction Kinetics of Transient Free Radicals with Pollutants in Aqueous Phase

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