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研究领域化学科学物理化学体和表面化学
在微污染物降解的冷地表水中的液态区域显著增强光生成的反应性中间体

在微污染物降解的冷地表水中的液态区域显著增强光生成的反应性中间体

Yu Zeng ¹, Mingyang Zhang ¹, Shuyao Zhou ², Qinglong Fu ³, Fei Peng ¹, Jinsong Liu ⁴, Yujun Wang ¹, Dongmei Zhou ⁴, Guodong Fang ¹

Yu Zeng ¹, Mingyang Zhang ¹, Shuyao Zhou ²

¹State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
²Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA.
³School of Environmental Studies, China University of Geoscience, Wuhan 430074, PR China.
⁴State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.

⁰State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.

Water Research +

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2025年九月6日

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在PubMed上查看摘要

概括

此摘要是机器生成的。

冷极大地增加了溶解有机物 (DOM) 中的光化学反应,在冰中生成的反应性中间体 (RIs) 比在水中高5到41倍. 这种特定于冰的过程在寒冷环境中增强了污染物的降解.

科学领域

环境化学
摄影化学
物理化学

背景情况

溶解有机物 (DOM) 在水生光化学中起着至关重要的作用.
结对DOM光化学和反应性中间体 (RI) 产生的影响尚不清楚.
现有的知识缺口阻碍了对寒冷生态系统污染物的准确预测.

研究的目的

在冷系统中研究DOM光化学过程中产生反应性中间体 (RI) 的机制.
与水溶液相比,量化冰中的RI放大.
确定影响冰相 RI 生成和随后污染物降解的特定 DOM 特性.

主要方法

激光扫描共聚焦显微镜可视化冰中的液态区域 (LLR) 的DOM和RI冷度.
分子分析以确定冰相RI的DOM前体.
使用模拟污染物 (imidacloprid 和 sulfadiazine) 的光化学降解实验.
密度函数理论 (DFT) 计算以探索热力学选择性和激活障碍.

主要成果

与水溶液相比,冷增加了冰中的RI度的5至41倍.
在冷度上增加了10^2-10^4倍的LLR的RI.
鉴定出含有氧的功能组的素和富含碳素的DOM是关键的冰相RI前体.
冰的特异性光化学加快了意达克洛普里德和硫法的降解速度,分别为5. 17倍和14. 8倍.
DFT计算证实了在冰中降解污染物的热力学选择性和减少的激活能量.

结论

结通过在LLR中缩RI显著增强DOM光化学.
与溶液相相比,冰相光化学涉及不同的DOM前体和路径.
这一过程在寒冷的生态系统中代表了一条被忽视的非生物降解途径.
这些发现对预测气候变化引起的融周期下的污染物命运具有重要意义.

关键词:

溶解的有机物结度的影响类似液体的区域微污染物反应性中间体

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