在先进的氧化过程中,内部和外部逆降解途径参与自由DNA基的降解
Shuangshuang Cheng1, Rui Cui1, Yuehong Sun1
1School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, PR China.
Water research
|July 8, 2025
概括
紫外线/PDS水处理显示出比紫外线/H2O2.2.更好地去除自由基. 关氨酸的降解涉及反降解过程,受到UV/H2O2和UV/PDS中的溶解有机物内部因素的影响.
科学领域:
- 环境化学环境化学
- 先进的氧化过程 先进的氧化过程
- 水处理 处理水的方法
背景情况:
- 自由基是核酸的关键组成部分,它们在水中的存在需要有效的去除.
- 像UV/H2O2和UV/硫酸盐 (UV/PDS) 这样的先进氧化工艺 (AOP) 用于净化水.
- 了解降解途径对于优化AOP效率至关重要.
研究的目的:
- 在UV/H2O2和UV/PDS下比较四个自由基 (腺素,关氨酸,细胞素,胆氨酸) 的降解动力学和降解机制.
- 调查影响瓜降解的内部和外部逆降解过程.
- 阐明溶解有机物 (DOM) 在这些降解途径中的作用.
主要方法:
- 在UV/H2O2和UV/PDS系统中自由基降解的比较动力学研究.
- 时间分辨率过渡光谱检测以确定关键中间体.
- 密度函数理论 (DFT) 计算来验证拟议的机制.
- 对反应速率常数的定量确定.
主要成果:
- 与UV/H2O2.2.相比,UV/PDS显示了所有四个自由基的更高的去除效率.
- 在这两种AOP中,胺基的降解速度比基更快.
- 关氨酸的降解涉及G-H基中间体,其内部反向减少UV/H2O2 (G-H速率常数:2.60 ± 0.12 × 108 M-1s-1),并通过DOM在UV/PDS中进行外部抑制.
- 紫外线/H2O2中的内在中间体抑制了DOM驱动的减少,解释了较低的降解率和在紫外线/PDS中更高的DOM抑制.
结论:
- 紫外线/PDS是一种比UV/H2O2.2.更有效的自由基去除AOP,而不是UV/H2O2.2.
- 在UV/H2O2中的内部逆降低机制和DOM在UV/PDS中的外部抑制显著影响降解途径.
- 了解这些反向减排过程可以提高预测污染物降解在现实水系统的预测.
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