碱调控过硫酸盐直接电荷转移氧化草甘膦及其机制

王颖; 张驰; 王佳琪; 陈亚松; 安晓强; 兰华春

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (6) : 3111-3117.

水污染与控制

碱调控过硫酸盐直接电荷转移氧化草甘膦及其机制

王颖¹, 张驰^2,3, 王佳琪^2,3, 陈亚松^2,3, 安晓强¹, 兰华春¹

作者信息 +

Removal of glyphosate via direct electron transfer based on PMS by adding NaOH and the corresponding mechanism

WANG Ying¹, ZHANG Chi^2,3, WANG Jia-qi^2,3, CHEN Ya-song^2,3, AN Xiao-qiang¹, LAN Hua-chun¹

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文章历史 +

摘要

针对高级氧化降解草甘膦过程中原位产生无机磷淬灭自由基而影响去除效率问题,开发出投加NaOH调节pH值实现过硫酸盐直接电荷转移氧化草甘膦的新策略.通过反应物浓度调控、自由基捕获及电子顺磁共振表征等手段,深入考查了NaOH投加量对草甘膦去除的重要贡献及其作用机制.研究结果表明,反应溶液pH值影响草甘膦和PMS的存在形态,进而导致草甘膦的去除率有所差异.碱性条件下,草甘膦的降解遵循直接电荷转移机制,而自由基对草甘膦分解的贡献较小,因此可以有效避免反应过程中原位生成的无机磷对自由基氧化过程的不利影响.在PMS和NaOH浓度分别为5mmo/L和6mmol/L的条件下,反应5min即可实现10mg/L草甘膦的完全分解.

Abstract

The removal efficiency of glyphosate may be affected due to the quenching process of radicals by in-situ produced inorganic phosphorous. To address the problem, we have developed a novel approach to achieve the direct electron transfer between glyphosate and PMS by adding NaOH to adjust the pH values. The effectiveness and mechanisms of glyphosate degradation in various NaOH concentration were evaluated by several experiments: optimizing the concentrations of reactants, radical trapping tests, and electron paramagnetic resonance (EPR) characterization. Varying pH could change the morphologies of glyphosate and PMS, as a result, accompanied the various glyphosate removal rate. Under alkaline condition, the mechanisms of glyphosate degradation depended on the direct electron transfer process, and insignificant contribution of hydroxyl and sulfate radicals. Thus, it effectively prevented the negative effects on radical oxidation by produced inorganic phosphorous during glyphosate removal processes. As a result, glyphosate (10mg/L) was completely decomposed after five minutes with the addition of 5mmol/L PMS and 6mmol/L NaOH.

导出引用

王颖, 张驰, 王佳琪, 陈亚松, 安晓强, 兰华春. 碱调控过硫酸盐直接电荷转移氧化草甘膦及其机制[J]. 中国环境科学. 2025, 45(6): 3111-3117

WANG Ying, ZHANG Chi, WANG Jia-qi, CHEN Ya-song, AN Xiao-qiang, LAN Hua-chun. Removal of glyphosate via direct electron transfer based on PMS by adding NaOH and the corresponding mechanism[J]. China Environmental Science. 2025, 45(6): 3111-3117

中图分类号： X703.5

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