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OH自由基引发的2-苯基苯并咪唑-5-磺酸的液相氧化机理

作者:时间:2025-05-02点击数:



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文章编号: 1672-6987202502-0052-10 DOI 10.16351/j.1672-6987.2025.02.008


李铭a 陈瑞欣b 杨姝a 孙延慧b*青岛科技大学 a.环境与安全工程学院; b.数理学院, 山东 青岛 266042

摘要: 基于量子化学方法对OH自由基引发的2-苯基苯并咪唑-5-磺酸 PBSA 的转化机制动力学及生态毒性进行研究PBSA降解反应中相对于H原子抽提和单电子转移反应OH自由基加成路径占主导地位OH自由基更容易攻击位于苯环上的C12位点生成优势中间体IM13并对其进行后续反应探究得到主要产物IM13-4a-12IM13-4a-14298 K1 atm1 atm=1.01×105 Pa PBSAOH自由基反应的总反应速率常数为2.98 × 109 mol · L · s-1 与实验测定结果相吻合极短的半衰期 0.16~30.20 s 说明OH自由基对于PBSA降解效果较好此外PBSA及其主要转化产物的水生生态毒性进行评估结果显示PBSA对于水生生物具有潜在的威胁且其代谢产物的生态毒性仍然存在


关键词: 2-苯基苯并咪唑-5-磺酸 OH自由基 降解机理 动力学计算 生态毒性评估


中图分类号: X 53X 71        文献标志码: A

引用格式: 李铭 陈瑞欣 杨姝 . OH自由基引发的2-苯基苯并咪唑-5-磺酸的液相氧化机理J. 青岛科技大学学报自然科学版 2025 462 52-61.


LI Ming CHEN Ruixin YANG Shu et al. Theoretical insights into the degradation mechanisms of 2-phenylbenzimidazole-5-sulfonic acid initiated by oh radicals in aqueous environmentsJ. Journal of Qingdao University of Science and TechnologyNatural Science Edition 2025 462 52-61.

Theoretical Insights into the Degradation Mechanisms of 2-Phenylbenzimidazole-5-sulfonic Acid Initiated by OH Radicals in Aqueous Environments

LI Minga CHEN Ruixinb YANG Shua SUN Yanhuiba.College of Environment and Safety Engineeringb.College of Mathematics and PhysicsQingdao University of Science and TechnologyQingdao 266042China

Abstract The transformation mechanismskinetics and eco-toxicity of 2-phenylbenzimidazole-5-sulfonic acid PBSA induced by OH radicals were studied based on quantum chemistry method. In the degradation of PBSAthe OH-addition pathways are dominant compared with the H-abstraction and single electron transfer reactions. The C12 site on the benzene ring was more likely to be attacked by OH radicalsgenerating the dominant intermediate IM13obtaining the main products IM13-4a-12 and IM13-4a-14 through follow-up exploration. At 298 K1 atmthe total reaction rate constant of PBSA with OH radicals is 2.98 × 109 mol · L · s-1 which is consistent with the experimental result. The very short half-lifves 0.16~30.20 s indicated that the OH radicals could degrade PBSA effectively.In additionthe aquatic eco-toxicity assessment of PBSA and its main transformation products were evaluatedwhich showed that PBSA has potential threat to aquatic organisms and the eco-toxicity of its metabolites still exists.


Key words 2-phenylbenzimidazole-5-sulfonic acidOH radicalsdegradation mechanismskinetic calculationeco-toxicity evaluation

收稿日期: 2024-07-05

基金项目: 国家自然科学基金项目21607089 山东省自然科学基金项目ZR2021MB039.

作者简介: 李铭 1997— 女, 硕士研究生.     * 通信联系人.


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