Herein we developed a rapid and efficient method via microwave solvothermal treatment to synthesize magnetically recoverable Fe₃O₄ nanocatalysts active under visible light. The synthesis parameters' influence on the structure, morphology, magnetic and photocatalytic properties of the synthesized nanoparticles was evaluated. The results obtained indicate that the proposed synthesis approach led to Fe₃O₄ semicrystalline nanoparticles' formation with an average size of ~15 nm in just 10 min. The synthesized nanoparticles show improved magnetic properties and an excellent activity under visible-light for the degradation of reactive azo dye MO and tetracycline, i.e., ~100% was removed through photocatalytic degradation in less than 10 and 90 min, respectively. The process also allowed the rapid recovery of the catalyst through the application of an external magnetic field.

本文中，我们开发了一种通过微波溶剂热处理的快速有效的方法，以合成在可见光下具有活性的磁性可回收Fe ₃ O ₄纳米催化剂。评价了合成参数对合成纳米颗粒的结构，形态，磁性和光催化性能的影响。获得的结果表明，所提出的合成方法导致了Fe ₃ O _{4的产生。}在短短10分钟内平均粒径约为15 nm的半结晶纳米颗粒的形成。所合成的纳米颗粒显示出改进的磁性和可见光下对偶氮染料MO和四环素降解的优异活性，即分别在不到10分钟和90分钟的时间内通过光催化降解除去了约100％的纳米颗粒。该方法还允许通过施加外部磁场来快速回收催化剂。