在草甘降解过程中通过单一的氧气主导的活性过氧硫酸盐选择性C-P键裂解
Rongrong Zhao1, Honglin Liu1, Danyi Chen1
1College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China; Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China.
Journal of hazardous materials
|July 25, 2025
概括
这项研究引入了一种新的单片氧 (1O2) 系统,通过向其碳位点来选择性降解草甘 (PMG),避免像AMPA.这样的有毒副产品. 这种方法为工业废水处理提供了一种可持续的方法.
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
- 废水处理 废水处理
背景情况:
- 草甘 (PMG) 的选择性降解是具有挑战性的,因为有毒的氨基甲基酸 (AMPA) 的形成.
- 现有的方法难以准确地准和分解PMG,而不会产生有害的中间体.
研究的目的:
- 开发一种单一的氧 (1O2) 驱动的活性过氧硫酸盐 (PMS) 系统,用于选择性PMG降解.
- 阐明PMG中选择性C-P债券裂变的机制.
- 为了评估系统在工业废水处理的连续流设置中的有效性.
主要方法:
- 使用酸激活的PMS系统与各种酸激活剂 (Na2B4O7,NaBO2,NaBO3,NaOH,Na2CO3) 相结合.
- 采用火试验,化学探针和EPR来确定1O2作为主要的活性氧物种 (ROS).
- 应用DFT计算用于机械洞察力和NMR/UHPLC-TQMS用于产品识别和CP债券分离确认.
- 开发并测试了长期废水处理的连续流系统.
主要成果:
- 激活的PMS系统有效降解了PMG,遵循伪第一阶动力学,观察到的速率常数 (kobs) 高达0.1555分钟-1.1.
- 单一氧气 (1O2) 被证实是主要的ROS,通过PMS自我分解和Na2B4O7催化生成.
- DFT的计算和实验证据证实了对酸盐组的选择性1O2攻击,分裂了C-P键,产生了甘氨酸和正酸盐.
- 连续流系统在1200分钟的运行中显示出稳定的PMG去除.
结论:
- 开发的1O2驱动性激活PMS系统为PMG降解提供了选择性和高效的方法.
- 这项研究阐明了一种新的C-P键裂解机制,提供精确的PMG含有废水的整治.
- 这种方法建立了一个可持续的战略,用于处理污染了草甘的工业废水.
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