异噁唑草酮除草剂的光-Fenton 和核黄素敏化过程。
Photo-Fenton and Riboflavin-photosensitized Processes of the Isoxaflutole Herbicide.
机构信息
Departamento de Estudios Básicos y Agropecuarios, Facultad de Agronomía y Veterinaria, UNRC, Río Cuarto, Cordoba, Argentina.
Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Río Cuarto, Cordoba, Argentina.
出版信息
Photochem Photobiol. 2019 May;95(3):901-908. doi: 10.1111/php.13047. Epub 2018 Nov 28.
The proherbicide Isoxaflutole (IXF) hydrolyzes spontaneously to diketonitrile (DKN) a phytotoxic compound with herbicidal activity. In this work, the sensitized degradation of IXF using Riboflavin (Rf), a typical environmentally friendly sensitizer, Fenton and photo-Fenton processes has been studied. The results indicate that only the photo-Fenton process produces a significant degradation of the IXF. Photolysis experiments of IXF sensitized by Riboflavin is not a meaningful process, IXF quenches the Rf excited triplet ( Rf*) state with a quenching rate constant of 1.5 · 10 m s and no reaction is observed with the species O ( Δ ) or generated from Rf*. The Fenton reaction produces no changes in the IXF concentration. While the photo-Fenton process of the IXF, under typical conditions, it produces a degradation of 99% and a mineralization to CO and H O of 88%. A rate constant value of 1.0 × 10 m s was determined for the reaction between IXF and HO˙. The photo-Fenton process degradation products were identified by UHPLC-MS/MS analysis.
原植物生长抑制剂异恶唑草酮（IXF）可自发水解为二酮腈（DKN），这是一种具有除草活性的植物毒性化合物。在这项工作中，使用核黄素（Rf）、典型的环保敏化剂、芬顿和光芬顿工艺对异恶唑草酮的敏化降解进行了研究。结果表明，只有光芬顿工艺才能显著降解 IXF。IXF 被核黄素敏化的光解实验并不是一个有意义的过程，IXF 以 1.5×10 ² m/s 的猝灭速率常数猝灭 Rf 激发三重态（Rf*），并且没有观察到与物种 O(Δ)或 ² 从 Rf*生成的反应。芬顿反应不会改变 IXF 的浓度。而在典型条件下，IXF 的光芬顿过程会产生 99%的降解和 88%的 CO 和 H₂O 矿化。确定了 IXF 和 HO˙之间反应的速率常数值为 1.0×10 ² m/s。通过 UHPLC-MS/MS 分析鉴定了光芬顿工艺的降解产物。
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