溶解氧对电化学Co/P/CA阴极系统中氧硫酸盐激活通路的影响
1College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China; Institute for Advanced Study, Shenzhen University, Shenzhen, China.
Chemosphere
|August 16, 2024
概括
溶解的氧气通过介导过氧硫酸盐的激活,显著改变了电-芬顿式的过程. 氧气促进基和单片氧的形成,而有利于硫酸盐基,影响污染物去除效率.
科学领域:
- 环境化学环境化学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 溶解氧在电-芬顿类过程中的作用至关重要,但研究不足.
- 过氧硫酸盐 (PMS) 的激活是高级氧化过程中污染物降解的关键.
- 了解反应性物种对于优化水利技术至关重要.
研究的目的:
- 为了研究溶解氧对过氧硫酸盐 (PMS) 激活在电-芬顿类系统中的作用.
- 识别和比较在有氧和无氧条件下产生的活性物种.
- 阐明溶解氧在PMS激活中的介导催化作用.
主要方法:
- 使用一种酸改性碳气凝 (Co/P/CA) 阴极.
- 采用电子偏磁共振光谱和火实验来识别自由基.
- 进行了旋转盘电极测试和自由能量计算,以分析反应路径.
主要成果:
- 在O2下,氧 (·OH),超氧 (O2-·) 和单氧 (1O2) 是主要的活性物种.
- 在N2下,基 (·OH) 和硫酸盐基 (SO4-·) 是主要的活性物种.
- 溶解的氧气促进了OH的形成,并产生了O2-,这是1O2的来源,而Co物种在N2下是关键.
结论:
- 溶解的氧气在电-芬顿类系统中起到介导催化剂的作用,影响PMS激活通路.
- 该研究提供了对氧气作用的实验和理论见解,这对于提高水资源整治效率至关重要.
- 这些发现有助于在复合系统中持续激活过氧化物,以加强污染物降解.
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