双碳酸盐通过炭增强无氧生成的活性氧物种:表面氧化功能组的激活和六价的去除
Na Chen1, Xianglei Zhang1, Yongliang Xu1
1College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China.
Water research
|May 1, 2025
概括
在黑暗中,用碳酸和氧化功能组生成超氧化基. 这种新的工艺有效地处理无氧水环境中的Cr (VI) 污染.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 在阳光下,已知能产生反应性氧物种 (ROS) 的能力.
- 在黑暗,无氧条件下,酸产生ROS的机制尚不清楚.
研究的目的:
- 在黑暗和无氧环境中研究酸盐的ROS生成.
- 阐明ROS形成的机制及其在污染物降解中的应用.
主要方法:
- 使用和碳酸盐生成超氧化基的实验分析.
- 电化学分析,密度函数理论 (DFT) 计算和表面表征.
- 产生的ROS用于Cr (VI) 减少的应用.
主要成果:
- 在性条件下 (最大24.7μmol L-1),和二碳酸盐会产生超氧化基 (O2•-).
- ROS生成独立于分子氧气,但依赖于水电上的氧化功能组 (OFG).
- 确定了一种涉及二碳酸盐复合,电子转移和氧气激活的机制,产生O2和碳酸盐基 (CO3).
- 生成的O2•-有效地将超过95%的Cr (VI) 降低到Cr (III).
结论:
- 在黑暗的无氧环境中发现了一种用于碳中介ROS生成的新途径.
- 在具有挑战性的水条件下,水炭显示出高级氧化过程和污染物转化潜力.
- 该研究强调了OFG和二碳酸盐在激活氧气用于ROS生产中的作用.
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