有机污染物的pH调节氧化用于水的净化:深入了解反应性和氧化途径
Peng Zhang1, Minglu Sun1, Juan Liang2
1State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China.
Journal of hazardous materials
|April 26, 2024
概括
溶液pH显著影响水净化过程中的有机污染物氧化. 调整pH值会改变污染物结构,影响其反应性,降解途径,甚至影响由此产生的副产品的毒性.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
背景情况:
- 溶液的pH值对于水的净化效率至关重要.
- 现有的研究广泛涵盖了pH对氧化剂和催化剂的影响,但缺乏对有机污染物氧化行为的系统研究.
- 了解pH取决于污染物的转化对于有效的水处理至关重要.
研究的目的:
- 研究pH对有机污染物的形式,反应性,活性点,降解途径和毒性的影响.
- 阐明污染物的pH诱导的结构变化如何影响它们的氧化命运.
- 要区分pH对污染物的影响与其对氧化剂/催化剂的影响.
主要方法:
- 对各种pH值的有机污染物行为进行系统研究.
- 对污染物的质子化/脱质化状态的pH诱导变化的分析.
- 评估污染物化学的变化,包括静电力,疏水性和氧化潜力.
主要成果:
- pH值的变化会改变有机污染物的形式 (质子化,原始化,脱质),影响它们的氧化潜力,顺序是:质子化>原始化>脱质.
- 质子化/脱质子化改变了污染物的活性点和降解途径,影响了对电友和核友攻击的易感性.
- pH 调整会影响降解途径和转化产品的毒性.
结论:
- 溶液的pH从根本上影响有机污染物的氧化,通过改变它们的内在结构和化学特性.
- 这些pH诱导的结构变化是污染物反应,降解和处理水中的副产品毒性的关键决定因素.
- 这些发现突出了pH影响污染物的独特机制,与其已知对氧化剂和催化剂的影响相比.
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