臭氧/氧单硫酸盐系统对UV328的降解:性能和机制
Mengyu Wang1, Can He2, Zhongguo Zhang3
1School of Environment, Beijing Jiaotong University, Beijing, 100044, China; National Engineering Laboratory of Circular Economy, Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, China.
臭氧和过氧硫酸盐有效降解持久有机污染物UV328.8. 这种先进的氧化过程,涉及单片氧,可以减少UV32828的辐射.
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
- 污染物的降解 污染物的降解
背景情况:
- UV328是一种持续性有机污染物,在全球范围内在环境样本中发现.
- 目前用于去除UV328的先进氧化工艺缺乏详细的机制理解.
- 研究有效的降解方法对于减轻环境风险至关重要.
研究的目的:
- 使用臭氧 (O3) 和过氧化硫酸盐 (PMS) 系统地研究UV328的降解.
- 为了阐明降解机制,并确定关键的反应性物种.
- 提出降解途径并评估由此产生的生态毒性.
主要方法:
- 在中性pH下使用O3和PMS进行UV328的试验降解.
- 涉及的反应性氧物种的识别 (基,硫酸盐基,单氧).
- 转换中间体的分析和密度函数理论 (DFT) 模拟的应用.
主要成果:
- 在优化的O3/PMS条件下,在5分钟内实现了97.0%的UV328去除.
- 降解速度与氧化剂度正相关.
- 单片氧 (1O2) 被确定为主要的活性物种,其中包括基 (•OH) 和硫酸盐 (SO4•−) 基.
结论:
- 臭氧/PMS处理是UV328降解的高效方法.
- 建议的降解途径包括脱,循环添加和化.
- O3/PMS工艺显著降低了与UV328.8相关的生态风险.
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