重新考虑过氧化在基于过氧单碳酸盐的氧化系统中的作用,以控制污染物
Zihan Yang1, Yi Zhou1, Yiqian Jiang1
1State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Water research
|November 10, 2024
概括
过氧单碳酸盐 (HCO4-) 作为先进水处理中的主要氧化剂,过氧化 (H2O2) 主要形成HCO4-. 这种系统有效降解了乙氨基,碳酸根 (CO3·-) 是负责污染物去除的关键物种.
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:
- 使用过氧单碳酸盐 (HCO4-) 的高级氧化工艺 (AOP) 对于清除水污染物至关重要.
- 过氧化 (H2O2) 在基于HCO4的AOP中确切的作用尚不清楚,需要进一步调查.
- 了解氧化剂激活机制对于优化AOP效率至关重要.
研究的目的:
- 建立和研究一种基于HCO4的氧化系统,用于降解乙氨基.
- 阐明共存氧化剂 (HCO4-和H2O2) 的激活机制.
- 确定负责乙氨基降解的主要反应性氧物种 (ROS).
主要方法:
- 使用二碳酸 (NaHCO3) 和H2O2生成HCO4-in-situ的实验设置.
- 在热激活下进行动力学研究和反应性氧物种 (ROS) 评估.
- 电子磁共振 (EPR) 分析和火实验用于ROS识别.
主要成果:
- 确定HCO4-是主要的氧化剂,而H2O2主要对其形成作出贡献.
- 在最佳条件下 (60°C,20毫米NaHCO3,20毫米H2O2) 乙氨基降解效率达到83%.
- 碳酸盐基 (CO3·-) 被证实是导致乙氨基降解的主要物种.
结论:
- 这项研究澄清了HCO2在基于HCO4的AOP中的H2O2的作用,强调了HCO4作为关键的氧化剂.
- 一个基于CO2衍生HCO4的新型系统证明了可比的降解效率.
- 这些发现为水处理的基于HCO4的氧化机制提供了基本的见解.
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