A facile coprecipitation-thermal method is reported to prepare spinel cobalt ferrites CoFe₂O₄ nanoparticles (NPs) with a well-defined mesoporous dominated structure using hybrid cobalt-ion hexacyanoferrate (CoFeHCF) NPs as a template. The properties of the synthesized catalysts are evidenced by various characterization methods. And the effects of time, pH, catalyst/oxidant/BPA dosage, coexisting ions and natural organic matter (NOM) on catalytic degradation of bisphenol A (BPA) are investigated. The as-prepared CoFe₂O₄ shows a high catalytic performance of 97% elimination for 45 μM BPA in 40 min. The excellent catalytic performance could be attributed to the large specific surface area (66.18 m²/g) and high content of cobalt (the atomic ratio of Fe/Co is 1.86) of CoFe₂O₄ NPs. Slightly alkaline pH, higher catalyst dosage and anions including Cl^- and CO₃^2-/HCO₃^- are favorable for BPA degradation. Especially, 81.57% mineralization of BPA could be achieved in 60 min under the optimization system. The catalytic capacity of CoFe₂O₄ could be regenerated by simple washing and drying at 200℃, which is much lower than the crystal temperature. SO₄∙^- and HO∙ are the primary reactive species responsible for BPA oxidation while SO₄∙^- might play a dominant role. This work provides a novel method to produce CoFe₂O₄ nanocatalysts for contaminant degradation and encourage the extended application of CoFeHCF in the environment.

报道了一种简便的共沉淀-热法，以混合钴离子六氰铁酸盐（CoFeHCF）NPs为模板，制备了具有定义明确的中孔主导结构的尖晶石钴铁氧体CoFe ₂ O ₄纳米颗粒（NPs）。合成的催化剂的性质通过各种表征方法证明。考察了时间，pH，催化剂/氧化剂/ BPA用量，共存离子和天然有机物（NOM）对双酚A（BPA）催化降解的影响。所制备的CoFe ₂ O ₄在40分钟内显示出对45μMBPA的97％消除的高催化性能。优异的催化性能可归因于较大的比表面积（66.18 m ²/ g）和高含量的CoFe ₂ O ₄ NPs （Fe / Co原子比为1.86）。微碱性pH值，较高的催化剂用量和阴离子含Cl ^-和CO ₃ ^2- / HCO ₃ ^-是BPA降解有利。特别是，在优化系统下，在60分钟内可以达到81.57％的BPA矿化。CoFe ₂ O ₄的催化能力可以通过简单的洗涤和在200℃下干燥来再生，这远低于晶体温度。SO ₄ ∙ ^-和HO∙是负责BPA氧化的主要反应性物质，而SO ₄ ∙ ^-可能起主导作用。这项工作提供了一种生产用于污染物降解的CoFe ₂ O ₄纳米催化剂的新方法，并鼓励了CoFeHCF在环境中的广泛应用。