[Heterogeneous Activation of Peroxymonosulfate with Three-dimensional Ordered Mesoporous CoO for the Degradation of Rhodamine B].

Three-dimensional ordered mesoporous CoO was prepared by nanocasting method with porous silicon KIT-6 as the hard template and firstly used to activate peroxymonosulfate for the degradation of rhodamine B. The structural properties were characterized by BET, H-TEM, XRD, XPS, FT-IR. The results showed that three-dimensional ordered mesoporous CoO presented far superior catalytic activity over conventional nanoscale CoO due to its abundant space mesoporous channel structure and the large specific surface areas. Higher catalyst dosage and higher peroxymonosulfate concentration favored the decolorization of rhodamine B. The removal of rhodamine B could be accelerated in the presence of Cl and HPO; however, the decolorization of rhodamine B would be inhibited in the presence of NO, SO and HCO. Sulfate radicals were identified as the dominant active species for the decolorization of rhodamine B through radicals quenching experiments. Three-dimensional ordered mesoporous CoO showed excellent catalytic activity even after five consecutive cycles.