Efficient recovery and utilization of the generated phosphorus during the process of organophosphorus pesticides degradation is promising but still challenging. In this study, a photo-Fenton-crystallization sequential processes were developed to achieve the degradation of organophosphorus pesticides and simultaneous recovery/utilization of the generated phosphate. In this system, iron ions exhibited dual functionality: activator of the photo-Fenton reaction and crystallizing agent of the generated phosphate and the crystals obtained were proved to be vivianite by X-ray Diffraction and Scanning Electron Microscopy. The results showed that a trichlorfon degradation rate exceeding 90% and a vivianite yield of 85.1% was achieved. Parameters such as pH and the Fe-P ratio play pivotal roles in phosphorus recovery efficiency from wastewater. In addition, the toxicity of the degradation by-products was much less than that of trichlorfon by the Toxicity Estimation Software Tool. Additionally, the recovered vivianite exhibits advantageous catalytic properties to activate peroxymonosulfate for the degradation of different pollutants. This study provides a novel perspective for the treatment and utilization of organophosphorus pesticides.

中文翻译：

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光芬顿有效降解有机磷农药并原位回收/利用所产生的磷：铁离子的双重功能

有机磷农药降解过程中产生的磷的有效回收和利用是有前景的，但仍然具有挑战性。在这项研究中，开发了光芬顿结晶连续工艺来实现有机磷农药的降解并同时回收/利用所产生的磷酸盐。在该体系中，铁离子表现出双重功能：光芬顿反应的活化剂和生成的磷酸盐的结晶剂，并且通过X射线衍射和扫描电子显微镜证明所得晶体为紫铁矿。结果表明，敌百虫降解率超过90%，菱铁矿收率达到85.1%。 pH 值和铁磷比等参数对废水中磷的回收效率起着关键作用。此外，通过毒性估算软件工具，降解副产物的毒性远低于敌百虫。此外，回收的紫铁矿表现出有利的催化性能，可以激活过一硫酸盐以降解不同的污染物。该研究为有机磷农药的处理和利用提供了新的视角。