Deep mineralization of VOCs in an embedded hybrid structure CoFe2O4/MoS2/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 CoFe 2 O 4 nanospheres and embedded into MoS 2 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 CoFe 2 O 4 /MoS 2 /PMS system, the toluene removal efficiency remained 95% within 2 h. The contribution of SO 4 ⋅- , ·O 2 - , ·OH, and 1 O 2 was revealed by radical quenching experiment and electron paramagnetic resonance spectroscopy. The results illustrated that MoS 2 offers ample reduction sites for facilitating PMS activation via Fe 3+ /Fe 2+ redox interactions. Furthermore, an investigation into the toluene degradation pathway within the CoFe 2 O 4 /MoS 2 /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.