从过氧化中释放固有的超氧化物生产,以有效降解PAH
Jiajie Zhou1, Shaohong Wang2, Yan Tian3
1State Key Laboratory of Urban-rural Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Journal of hazardous materials
|February 6, 2026
概括
一个新的过氧酸盐 (PPB) 芬顿式系统有效地修复土壤中的多环芳 (PAHs). 该系统增强了反应性氧物种 (ROS) 生产和铁循环,比传统方法更好地降解污染物.
科学领域:
- 环境化学环境化学
- 绿色化学 绿色化学
- 整治技术 整治技术
背景情况:
- 传统的Fenton-like系统用于in-situ化学氧化 (ISCO) 由于低效的活性氧物种 (ROS) 利用和慢铁氧氧还原循环而受到影响.
- 多环芳 (PAH) 是持久性有机污染物,需要有效的整治策略.
研究的目的:
- 开发和评估一种使用过氧化 (PPB) 和铁酸 (Fe ((III) /NTA) 进行增强的PAH补救的新型芬顿式系统.
- 阐明PPB/Fe (III) /NTA系统中ROS生成和铁循环的机制.
主要方法:
- 开发一个类似芬顿的PPB/Fe (III) /NTA系统.
- 使用烯作为PAH模型的比较降解研究.
- 使用电子磁共振和同位素追踪 (18O标记) 进行ROS生成的研究.
- 密度函数理论 (DFT) 计算以了解反应机制.
- 污染土壤修复系统的应用.
主要成果:
- 这种PPB/Fe (III) /NTA系统的降解效率比H2O2/Fe (III) /NTA系统高6.34倍.
- PPB可持续地产生H2O2,减少非生产性ROS损失,并显著增加超氧化基 (•O2−) 的产生.
- •O2−,源于PPB的O-O债券裂变,加速了Fe (III) 减少到Fe (II).
- 在受污染的土壤中,PPB/Fe (III) /NTA系统实现了66%的PAH总去除,超过了H2O2/Fe (III) /NTA系统 (29%的去除).
结论:
- 过氧酸盐 (PPB) 在芬顿类反应中充当ROS储存器和内源激活剂.
- PPB/Fe (III) /NTA系统为污染土壤中PAHs的现场化学氧化 (ISCO) 提供了一个有希望和有效的策略.
- 这项研究促进了对芬顿式反应机制的理解,并为环境修复提供了一种新的方法.
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