| 초록 |
•OH is regarded as one of powerful oxidants utilized to decompose recalcitrant. •OH can be produced via catalytic H2O2 cleavage on S-modified Feδ+ species (δ ≤ 2) inherent to iron sulfides. The resulting •OH species produced, yet, are found insufficient to fully oxidize the recalcitrants because of the limited •OH productivity and chemical susceptibility Feδ+ species can impart. To locate S-modified metal species (Mδ+, M: metal) that can outperform the Feδ+ counterparts with regards to H2O2 scission coupled with chemical sturdiness, here we synthesize five Group IV metal sulfides, whose geometries (hexagonal) and chemical formula (MS) are identical one another. Niδ+ species are identified to provide the greatest H2O2 scission rate and phenol consumption rate among the Mδ+ species studied and therefore are located in the middle of the volcano-shaped curve plotting -rH2O2, 0 (or -rPHENOL, 0) versus Mδ+. Electric potential-assisted control runs corroborate that •OH desorption is the rate-determining step and that the Niδ+ species are most appropriate to release •OH species, while minimizing the leaching issue among all Mδ+ species examined. |
