Deep mineralization of VOCs in an embedded hybrid structure CoFeO/MoS/PMS wet scrubber system.

Peroxymonosulfate (PMS)-based advanced oxidation processes in liquid phase systems can actively degrade toluene. In this work, the catechol structural surfactant was introduced to synthesize the dispersed and homogeneous CoFeO nanospheres and embedded into MoS nanoflowers to form magnetically separable heterojunction catalysts. The innovative approach effectively mitigated the traditionally low reduction efficiency of transition metal ions during the heterogeneous activation process. In CoFeO/MoS/PMS system, the toluene removal efficiency remained 95% within 2 h. The contribution of SO, ·O, ·OH, and O was revealed by radical quenching experiment and electron paramagnetic resonance spectroscopy. The results illustrated that MoS offers ample reduction sites for facilitating PMS activation via Fe/Fe redox interactions. Furthermore, an investigation into the toluene degradation pathway within the CoFeO/MoS/PMS system revealed its capability to suppress the formation of toxic byproducts. This ambient-temperature liquid-phase method presented promising route for the removal of industrial volatile organic pollutants.