A magnetic core–shell Pr₆O₁₁/SiO₂@Fe₃O₄ catalyst using chemical precipitation was prepared. Its structure was confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and energy-dispersive X-ray spectrum. The catalytic activity was evaluated by the catalytic ozonation of acetochlor. The results showed that the catalyst could effectively improve the acetochlor removal and mineralization. The total organic carbon removal reached 37.3% with the catalyst at 120 min, whereas the removal was 14.1% with ozonation alone. The catalyst was proved to be stable and recyclable by determining the concentration of the leaching praseodymium ions and the catalyst’s activity after repeated use. The effect of the radical scavengers indicated that the catalytic ozonation process followed an OH reaction mechanism. In addition, we employed Chlorella and zebrafish as model organisms to investigate the aquatic toxicity of the treated solution and the dissolved praseodymium ions. We found that the aquatic toxicity of the reaction solution decreased with an increase in the degradation time, and no obvious toxicity was found for the dissolved praseodymium ions.

磁芯-壳Pr ₆ O ₁₁ / SiO ₂ @Fe ₃ O ₄使用化学沉淀法制备催化剂。通过X射线衍射，X射线光电子能谱，透射电子显微镜和能量色散X射线光谱确认了其结构。催化活性通过乙草胺的催化臭氧化来评估。结果表明，该催化剂能有效提高乙草胺的去除率和矿化度。在120分钟时，使用催化剂的总有机碳去除率达到37.3％，而仅进行臭氧化处理的去除率为14.1％。通过确定浸出。离子的浓度和重复使用后催化剂的活性，证明了该催化剂是稳定的和可回收的。自由基清除剂的作用表明催化臭氧化过程遵循OH反应机理。另外，我们雇用了以小球藻和斑马鱼为模型生物，研究了处理过的溶液和溶解的ody离子的水生毒性。我们发现反应溶液的水生毒性随着降解时间的增加而降低，并且对于溶解的离子没有发现明显的毒性。