Sulfate radicals induced from peroxymonosulfate by magnetic ferrospinel MFe2O4 (M = Co, Cu, Mn, and Zn) as heterogeneous catalysts in the water

Cobalt-iron Oxide, Alloy and Nitride: Synthesis, Characterization and Application in Catalytic Peroxymonosulfate Activation for Orange II Degradation

“…In the used CFA-600, a new peak appeared at 783.1 eV representing Co 3+ in octahedral site appeared (Figure 11a), indicating the oxidation of Co 2+ to Co 3+ during the catalytic reaction. This transformation was also reported by Ren et al who found that Co 3+ emerged after PMS activated degradation [18]. Besides, no significant variation took place in the valence state of Fe before and after reaction, since only Fe 3+ was observed (Figure 11b).…”

“…In the past years, several investigations have been carried out to recognize the mechanism of Co/Fe-based catalysts in the activation of PMS. It has been reported that when CoFe 2 O 4 was used as a catalyst for PMS activation, cobalt mainly presented as Co 2+ before reaction, and it underwent partial transformation to Co 3+ after catalytic reaction, in which the involvement of Co 2+ -Co 3+ -Co 2+ redox processes were proposed during the reaction [18]. In addition, sulfate radical was found to be generated as the main active species in oxone activation by cobalt-iron oxides [22,48].…”

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

“…In addition, complex compounds of phosphate-Co could be produced in the presence of phosphate ions [44]. It was reported that the active sites such as surface hydroxyl groups will be occupied by phosphate and undermine the inner-sphere complexation due to their very strong affinity to active sites [15,49]. Thus, it may be assumed that the inhibition of phenol degradation due to the deactivation of Co-OMC surface by phosphate.…”

“…Some heterogeneous catalysts such as Co 3 O 4 [10], CoFe 2 O 4 [11] and CuFe 2 O 4 [12][13][14] were efficient for the activation of PMS. For instance, Ren et al [15] reported magnetic ferrospinel MFe 2 O 4 (M = Co, Cu, Mn, and Zn) activate PMS for the degradation of di-n-butylphthalate, in which CoFe 2 O 4 presented the highest catalytic activity. Sun et al [16] reported that CoFe/ CoFe 2 O 4 submicron composite materials exhibited high decomposition efficiency of Orange II and excellent reusability.…”

Removal of aqueous metazachlor, tembotrione, tritosulfuron and ethofumesate by heterogeneous monopersulfate decomposition on lanthanum-cobalt perovskites

“…A number of previous studies have investigated the heterogeneous catalytic decomposition of MPS using cobalt oxides such as CoO and Co 3 O 4 [11], spinel cobalt ferrite (CoFe 2 O 3 ) [12], and cobalt supported onto diverse materials like different oxides (TiO 2 , MgO, Al 2 O 3 , SiO 2 , MnO 2 or ZnO) or activated carbon [6]. In a high number of cases, problems associated to cobalt leaching have been experienced.…”