常温常压纳米零价铁活化分子氧矿化三嗪类除草剂新策略

发布时间：2018-04-14 16:39

本文选题：农药 + 三嗪环　；参考：《环境化学》2016年10期

【摘要】：三嗪环的开环及矿化是三嗪类除草剂农药在环境中彻底消除的必要步骤.温和条件下高级氧化技术氧化三嗪类除草剂的最终产物是三聚氰酸,无法实现其开环矿化.本课题组拟通过在纳米零价铁活化分子氧氧化体系引入镍离子,促进氢自由基产生,调控体系中活性物种种类,诱导三嗪类除草剂加氢脱氯,避免羟基自由基加羟基脱氯生成极其稳定的三聚氰酸中间产物,优化三嗪类除草剂的降解途径,实现常温常压下纳米零价铁活化分子氧矿化三嗪类除草剂.本文计划系统考察体系中界面电子转移途径、分子氧活化机理、溶剂水的作用、活性物种的种类,深入分析活性物种生成和消亡途径;研究除草剂污染物的降解特性以及各种活性物种在三嗪类除草剂C—Cl和C—N键断裂过程中的作用,揭示不同活性物种与典型三嗪类除草剂的相互作用规律,阐明三嗪类除草剂降解和三嗪环开环等机理,为发展绿色高效农药污染控制技术提供理论支持.
[Abstract]:The ring opening and mineralization of triazine ring is a necessary step for the complete elimination of triazine herbicides in the environment.Under mild conditions, the final product of oxidation of triazine herbicides by advanced oxidation technology is cyanuric acid, which is unable to realize its ring opening mineralization.In order to induce hydrodechlorination of triazine herbicides, we propose to introduce nickel ion into the system of nano-zero valent iron activated molecular oxygen oxidation system, to promote the production of hydrogen free radicals, to regulate the species of active species in the system, and to induce hydrodechlorination of triazine herbicides.To avoid the addition of hydroxyl radical and hydroxyl dechlorination to produce extremely stable intermediate product of tripolycyanate, to optimize the degradation pathway of triazine herbicides, and to realize the molecular oxygen mineralization of triazine herbicides activated by nanometer zero-valent iron at room temperature and atmospheric pressure.In this paper, the interfacial electron transfer pathway, the mechanism of molecular oxygen activation, the effect of solvent water, the species of active species, and the formation and extinction of active species in the system are systematically investigated.The degradation characteristics of herbicide pollutants and the role of various active species in the breaking process of C-Cl and C-N bonds of triazine herbicides were studied, and the interaction rules between different active species and typical triazine herbicides were revealed.The mechanism of triazine herbicide degradation and triazine ring opening is expounded, which provides theoretical support for the development of green and efficient pesticide pollution control technology.
【作者单位】：农药与化学生物学教育部重点实验室华中师范大学化学学院;
【基金】：国家自然科学基金(21477044)资助~~
【分类号】：X592

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