在氧激活过程中,在磁铁表面因结构性Fe (II) 诱导的反应性氧物种产生,用于水性As (III) 氧化
Fangyuan Meng1, Hui Tong2, Chunhua Feng3
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China.
磁石激活氧气产生活性氧物种 (ROS),在有氧条件下氧化. 这一过程使在磁铁结构中的固定,影响其环境命运.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 矿物学是什么?矿物学是什么?
背景情况:
- 磁铁石的还原性质是无氧环境中污染物降解的关键.
- 地下环境中的氧化还原波动可以从矿物与氧的相互作用中产生活性氧物种 (ROS).
- 磁铁在有氧条件下产生ROS的机制及其在氧化中的作用尚不清楚.
研究的目的:
- 在有氧条件下研究磁铁诱导的ROS生成机制.
- 阐明磁铁在氧化氧化环境中的磁铁的作用.
- 为了确定不同ROS对As (III) 氧化的贡献.
主要方法:
- 电子偏磁共振 (EPR) 光谱学
- 消火试验 消火试验 消火试验
- 密度函数理论 (DFT) 的计算.
- 对 (III) 氧化过程的实验分析
主要成果:
- 磁石激活O2,产生超氧化基离子 (O2•−),过氧化 (H2O2) 和基 (•OH).
- O2•−和H2O2是导致氧化的主要ROS,分别贡献了大约52%和19%.
- 由于III) 氧化主要发生在磁铁表面,导致在矿物结构中的固定.
结论:
- 磁石在有氧条件下通过ROS生成,在As(III) 的氧化转化中发挥着重要作用.
- 了解这些机制对于预测在动态地下环境中的命运和运输至关重要.
- 这些发现凸显了磁铁在污染物修复中的双重作用,根据氧化还原条件,磁铁既起着减少剂的作用,又起着氧化促进剂的作用.
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