通过非反应性氧物种通路氧化过氧硫酸盐氧化脱硫的机械洞察力
Jianfei Wang1, Wenwei Liu1, Haiyang Jiang1
1Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China.
Journal of hazardous materials
|May 2, 2024
概括
氧硫酸盐 (PMS) 通过直接攻击SO2而有效地从烟气中去除二氧化硫 (SO2),从而避免反应性氧物种. 这种新的方法优化了硫酸盐 (PS) 的利用,以实现高效的脱硫.
科学领域:
- 环境化学环境化学
- 化学工程是化学工程的重要组成部分.
- 大气科学 大气科学
背景情况:
- 由二氧化硫 (SO2) 造成的空气污染对环境和健康构成重大风险.
- 基于硫酸盐的先进氧化工艺 (PS-AOPs) 用于去除SO2,但面临着反应性氧物种 (ROS) 寿命和高PS消耗的挑战.
- SO2的快速气体-液体质量转移与有限的ROS稳定性形成鲜明对比,需要过多的硫酸盐 (PS) 进行连续脱硫.
研究的目的:
- 研究一种新的SO2氧化吸收途径,使用绕过活性氧物种 (ROS) 的硫酸盐 (PS).
- 评估过氧化硫酸盐 (PMS) 和过氧化硫酸盐 (PDS) 在SO2去除中的效率.
- 为了确定PMS在烟气脱硫利用的最佳条件.
主要方法:
- 使用PMS和PDS进行SO2去除的实验调查.
- 计算分析以了解反应机制.
- 确定PMS与SO2的最佳摩尔比率,以有效去除.
主要成果:
- 与过氧化硫酸盐 (PDS) 相比,过氧化硫酸盐 (PMS) 显示出更高的SO2去除性能.
- 有效的PMS利用在1:1的摩尔比率与去除的SO2实现.
- 反应机制涉及HSO3-对PMS的直接核友性攻击,由于HOO键的极性,导致SO2转化为硫酸盐离子 (SO4^2-).
结论:
- PMS可以通过非ROS途径实现高效的SO2氧化吸收,直接与SO2中间体相互作用.
- 这种直接氧化机制为烟气脱硫提供了一种新且可能更可持续的方法.
- 优化的PMS利用大大减少了过度PS的需求,解决了以前的局限性.
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