Abstract A novel unconventional coprecipitation procedure (UCP) followed by a simple and fast microwave-assisted hydrothermal (MAH) treatment was used to synthesize a new nanocrystalline magnetic cobalt ferrite (CoFe2O4/MAH) with photo-Fenton activity. The Co-ferrite nanoparticles were obtained at room temperature in the absence of surfactants and their photo-Fenton activity was evaluated through lignin degradation. It was found that microwave hydrothermal treatment is mandatory to obtain magnetic and photoactive Co-ferrite. According to XRD Rietveld refinements and FTIR, the photoactivity was mainly attributed to the Co2+ cation migration from octahedral to tetrahedral sites in the ferrite structure during the MAH treatment, leading, consequently, to a higher Fe3+ incorporation at octahedral sites, which strongly participate in the photo-Fenton degradation mechanism. The magnetic property of the CoFe2O4/MAH ferrite nanoparticles was confirmed by magnetometry and provided an easy catalyst separation.

中文翻译：

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一种获得具有光芬顿活性的磁性纳米晶钴铁氧体的新合成路线

摘要 采用一种新型的非常规共沉淀法 (UCP) 和简单快速的微波辅助水热法 (MAH) 处理，用于合成具有光芬顿活性的新型纳米晶磁性钴铁氧体 (CoFe2O4/MAH)。在没有表面活性剂的情况下，在室温下获得钴铁氧体纳米颗粒，并通过木质素降解评估它们的光芬顿活性。发现微波水热处理是获得磁性和光活性钴铁氧体所必需的。根据 XRD Rietveld 改进和 FTIR，光活性主要归因于 MAH 处理期间 Co2+ 阳离子从铁素体结构中的八面体位置迁移到四面体位置，从而导致在八面体位置处掺入更高的 Fe3+，强烈参与光芬顿降解机制。CoFe2O4/MAH 铁氧体纳米粒子的磁性通过磁力测定法得到证实，并提供了一种简单的催化剂分离。