以为媒介的硫酸激活水中的高效氧化除污染:性能,动力学和机制
Bangkang Yue1, Shuang Liu1, Weizhen Zhang1
1College of Environment and Ecology, Chongqing University, Chongqing 400044, PR China.
Journal of hazardous materials
|October 9, 2023
概括
硫酸 (CaSO3) 为高级氧化过程 (AOPs) 提供了一种改进的方法,通过缓慢释放硫酸 (S(IV)) 来比硫酸更有效地降解牛素 (OFL).
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 先进的氧化过程 先进的氧化过程
背景情况:
- 基于硫酸盐 (S(IV)) 的先进氧化过程 (AOP) 经常受到过多的硫酸盐离子抑制反应性中间体的影响.
- 可溶性硫化 (Na2SO3) 可以清除基因,限制处理效率.
研究的目的:
- 开发一种更持久的基于S{IV}的AOP,使用硫酸 (CaSO3) 作为替代性S{IV}来源与 (Co{II)).
- 通过使用Co(II) /CaSO3工艺研究牛素 (OFL) 的降解,并与Co(II) /Na2SO3系统进行比较.
主要方法:
- 使用CaSO3作为一种缓释S (IV) 源,用于Co (II) 介导系统.
- 研究了奥洛素 (OFL) 的降解动力学和降解机制.
- 分析的活性物种包括硫酸盐基 (SO4•−),Co(IV) 物种和单片氧 (1O2).
主要成果:
- 与Co(II) /Na2SO3 (3.18 mM-1 分-1 分-1 分) 相比,Co(II) /CaSO3工艺显示出明显更高的OFL降解率 (12.1 mM-1 分-1 分).
- 该机制涉及一种类似芬顿的过程,包括Co (II) 复合和分子内电子转移.
- 确定并阐明了SO4•−,Co(IV) 和1O2在降解过程中的作用.
结论:
- 二/三过程提供了持久的四源,提高了污染物降解的AOP效率.
- 该系统对复杂的水矩阵具有很好的耐受性,这表明实际废水处理应用的巨大潜力.
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