Photochemical transformation of terephthalic acid and chlorine radicals in atmospheric liquid phase

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2025, Vol.48 No.8: 1016-1021

DOI: 10.3969/j.issn.1003-5060.2025.08.002

Authors

HE Han $ ^{1} $, ZHU Chengzhu $ ^{1-2} $, WU Wenjuan $ ^{1} $, DONG Linchang $ ^{1} $, YANG Yue $ ^{1} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Institute of Atmospheric Environment and Pollution Control, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In this work, the photochemical transformation mechanism between terephthalic acid (TPA) and chlorine radicals in the atmospheric liquid phase was investigated. The growth and decay kinetics of the transient species were examined using 355 nm laser flash photolysis experiments, and the reaction products were analyzed by gas chromatography-mass spectrometry (GC-MS) technique. Through the laser flash photolysis experiments, the secondary rate constants for the reaction of $ Cl \cdot $ and $ Cl_{2} \cdot^{-} $with TPA were measured to be $ 4.04 \times 10^{10} $ L/(mol·s) and $ 5.49 \times 10^{6} $ L/(mol·s), respectively. The products of reaction were mainly p-benzoquinone, 2-nitro-terephthalic acid, p-chlorobenzoic acid, 2-chloro-terephthalic acid, and 2,6-dichloro-terephthalic acid. Based on the laser flash photolysis experiments, it was found that the photoconversion of TPA involved three reaction pathways: formation of Cl-adducts, decarboxylation, and nitration.

Keywords: terephthalic acid (TPA); chlorine radicals; atmospheric liquid phase; laser flash photolysis; photochemical transformation

作者信息

何函 $ ^{1} $，朱承驻 $ ^{1,2} $，吴文娟 $ ^{1} $，董林昌 $ ^{1} $，杨悦 $ ^{1} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 合肥工业大学大气环境与污染控制工程研究所，安徽合肥 230009)

摘要和关键词

摘要: 文章研究对苯二甲酸(TPA)与氯自由基在大气液相中的光化学转化机理, 利用 355 nm 激光闪光光解实验探究瞬态物种的生长和衰减动力学, 反应产物由气相色谱-质谱联用技术进行分析。激光闪光光解实验测得 $ Cl^{-} $、 $ Cl_{2}\cdot^{-} $与 TPA 反应的二级速率常数分别为 $ 4.04 \times 10^{10} $、 $ 5.49 \times 10^{6} \mathrm{~L}/(\mathrm{mol}\cdot\mathrm{s}) $。TPA 与氯自由基的反应产物主要有对苯醌、2-硝基对苯二甲酸、对氯苯甲酸、2-氯对苯二甲酸和 2,6-二氯对苯二甲酸, 结合激光闪光光解实验可知, TPA 的光转化有形成 Cl- 加合物、脱羧和硝化 3 种反应途径。

关键词: 对苯二甲酸(TPA)；氯自由基；大气液相；激光闪光光解；光转化反应

Funding

国家自然科学基金资助项目（22376049）

合肥工业大学学报(自然科学版)

Navigation