The conventional Fenton reaction has played a vital role in the degradation of pollutants. However, this reaction is prone to forming iron mud, which causes secondary pollution. Additionally, most of the Fenton systems are in homogeneous forms and suffer from intrinsically short lifetimes, hydroxyl radicals that have short diffusion distances (OH) and non-recyclability. Herein, using magnetic composites (Fe₃O₄@SiO₂) as the carrier and vanadium oxide quantum dots (VO_xQDs) as the catalyst, we developed a renewable, heterogeneous, magnetic Fenton-like system for dye degradation in polluted wastewater. The VO_xQDs of less than 10 nm showed large specific surface areas, enhanced surface-exposed active atoms, and low toxicity, which are favourable for developing an efficient Fenton-like system. In addition, owing to the electrostatic adsorption between the as-prepared catalyst and the dye molecules, the distance for OH sterilization and decolorization can be significantly reduced, overcoming the shortcomings of the short oxidation distance of OH. Accordingly, the degradation of dyes can be achieved in five seconds. Furthermore, the catalysts can be effectively separated and recycled based on their magnetic features, while the secondary pollution from both the catalysts and the incompletely degraded dye molecules into the environment can be avoided. In addition, the Fe₃O₄@SiO₂ is able to maintain a superior morphology, and the composite material (VO_xQDs/Fe₃O₄@SiO₂) maintains more than 90% of the degradation effects even after eight repeated tests.

常规的芬顿反应在污染物的降解中起着至关重要的作用。但是，该反应易于形成铁泥，从而引起二次污染。此外，大多数Fenton系统呈均相形式，并且固有寿命短，扩散距离（OH）短的羟基自由基和不可回收性。在本文中，我们使用磁性复合材料（Fe ₃ O ₄ @SiO ₂）作为载体，并使用氧化钒量子点（VO _x QDs）作为催化剂，开发了一种可再生的，异质的，类似于Fenton的磁性系统，用于污染废水中的染料降解。VO _x小于10 nm的量子点显示出较大的比表面积，增强的表面暴露活性原子和低毒性，这有利于开发高效的Fenton样系统。另外，由于所制备的催化剂和染料分子之间的静电吸附，可以显着减小OH灭菌和脱色的距离，克服了OH短氧化距离的缺点。因此，可以在五秒钟内实现染料的降解。此外，可以基于催化剂的磁性特征有效分离和回收催化剂，同时可以避免催化剂和不完全降解的染料分子对环境的二次污染。另外，Fe ₃ O ₄@SiO ₂能够保持优异的形貌，并且即使经过八次重复测试，复合材料（VO _x QDs / Fe ₃ O ₄ @SiO ₂）仍可以保持90％以上的降解效果。