Investigating crystal plane effect of Co3O4 with various morphologies on catalytic activation of monopersulfate for degradation of phenol in water

As phenol represents as the most typical persistent organic pollutants in wastewater, SO4•−-involved chemical oxidation techniques using monopersulfate (MPS) have been regarded a promising method to eliminate phenol. Since Co3O4 is benchmark heterogeneous catalyst for activating MPS, it highly critical investigate shape-varied catalysts with well-defined crystal planes MPS degrade Thus, aim of this study elucidate how different various would influence catalytic activities activation. Specifically, three nanocrystals are fabricated: nanoplate (NP), nanobundle (NB), and nanocube (NC) dominant exposed facets {1 1 2}, 0}, 0 respectively. 2} 0} consist more abundant Co2+/Co3+, Co3O4-NP Co3O4-NB exhibit noticeably higher then Co3O4-NC Nevertheless, since shows much surface area than Co3O4-NB, could relatively high activity comparison Co3O4-NB. In addition, also exhibits faster degradation kinetics rate constant 0.061 min−1 at 30 °C, resistance towards pH variation, stable reaction stoichiometric efficiencies (RSE) ranging from 0.034 0.039 = 3 ~ 9, other two nanocrystals, making facet outstanding