Abstract
In this study, the morphology and surface characteristics of different MxMn3-xO4 (M = Co, Zn, Cu, Fe; x = 1, 2) nanoparticles and their catalytic performance for peroxymonosulfate (PMS) activation to degrade trichloroethylene (TCE) were compared. The characterization results showed that a highly crystalline manganese structure was synthesized, and cubic spinel (M2MnO4) and tetragonal spinel (MMn2O4) were confirmed. The experimental results indicated that, compared with the tetragonal spinel catalysts, the cubic spinel catalysts exhibited higher PMS-specific catalytic activity and TCE removal efficiency due to the reduction in electron transfer resistance and the increase of the surface area. In addition, all the synthesized nanoparticles exhibited remarkable reusability, a low metal dissolution rate, and a wide applicable pH range (4 to 11) for efficient PMS activation. The free radical-scavenging experiments and electron paramagnetic resonance (EPR) analysis further verified the role of ∙HO and SO4∙− in the removal of TCE and the large amount of stronger free radicals (SO4∙−) generated by the cubic spinels. This study revealed that stable cubic spinel nanoparticles can be synthesized at room temperature by adjusting the ratio of manganese and transition metals; these nanoparticles showed excellent catalytic performance for PMS activation. These research results are important for the synthesis of heterogeneous catalytic oxidation catalysts.
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