Abstract: In recent years, sulfate radicals-based advanced oxidation process becomes an effective and common technique for elimination?of emerging organic contaminants.?In?this?study, novel?NiCo₂S₄/CS composite?was synthesized?through hydrothermal method, with the physicochemical properties?being characterized?by X-ray diffraction (XRD), scanning electron microscope?(SEM), transmission electron microcopy (TEM), Brunauer-Emmett-Teller (BET) and Fourier Transform infrared spectroscopy?(FT-IR). Then, NiCo₂S₄/CS composite?acted as catalyst to activate PS for nimesulide degradation. The results showed that NiCo₂S₄/CS composite?owned the highest activity?compared?with?pure NiCo₂S₄?and carbon sphere (CS), achieving 92% nimesulide degradation in 10 min with 0.1 g/L catalyst and 0.4 g/L persulfate. Furthermore, the NiCo₂S₄/CS membrane was fabricated by vacuum filtration, and 94% and 80% above nimesulide degradation were realized for the first time and after six times repeated experiment, which demonstrated that the catalyst was convenient?to achieve recovery and reusability. In addition, the radical quenching experiment, XPS and the electrochemical methods (LSV and EIS) were measured to investigate the possible mechanism?pathway, the results of which showed that both the non-radical pathway and radical pathway might attribute to nimesulide degradation, while the SO4?^??remained the dominant species. This research provided a novel sulfide NiCo₂S₄/CS membrane for the oxidative technique for emerging organic contaminants?in water treatment.

Key words:?NiCo₂S₄/CS membrane; Sulfide; Carbon sphere; Persulfate; Nimesulide

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