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Co@MoS2 Nanocatalyst: Enhanced Activation of Peroxymonosulfate for Effective Degradation of Sulfadiazine

Sai Wang,En-Ni Wu,Liang Meng,Zhen-Jun Wang,Tuan-Tuan Wang

To improve the activation efficiency of PMS to efficiently degrade antibiotic sulfadiazine (SD), herein, a Co@MoS 2 catalyst was prepared by a one-step hydrothermal process. The unique petal-like structure of MoS 2 enables the transition metal Co to achieve high dispersion and avoid agglomeration. Mo(IV) and unsaturated S accelerate the electron transfer between Co 2 + ${}^{2+}$ and Co 3 + ${}^{3+}$ to improve the cycling efficiency and thus realize the efficient activation of PMS. The results of active substance quenching experiment and ESR analysis show that the main active substance for the efficient degradation of SD by Co@MoS 2 is the non-radical 1 O 2 , while the other three radicals ⋅ O − 2 $\cdot {\mathrm{\text{O}}}_2^{-}$ , ⋅OH and SO • − 4 ${\mathrm{\text{SO}}}_4^{•-}$ contribute significantly to the efficient degradation of SD. And after 5 cycles, the degradation could still be as high as 90%. The strong consolidation of Co on the petal-shaped sheet of MoS 2 ensures the stability of Co@MoS 2 catalyst.