Investigation on flower-shaped Ni-doped Fe3O4/SnS2 formation mechanism through a microcalorimetric method and catalytic property as a Fenton-like catalyst
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Flower-shaped Ni-doped Fe3O4/SnS2 composite was synthesized by a one-pot solvothermal method, where nanosized Ni-doped Fe3O4 particles were dispersed on the SnS2 sheets and these sheets built the flower-shaped structure. A microcalorimeter was employed to study the Ni-doped Fe3O4 formation processes with the SnS2. The experimental results indicated that the Ni-doped Fe3O4 formation mechanism is similar with and without the SnS2. Different endothermal processes demonstrated that the interaction between the cations (Fe3+, Fe2+ and Ni2+) and S2− induced various morphologies of the Ni-doped Fe3O4. Cluster-shaped Ni-doped Fe3O4 was synthesized without SnS2. The composite exhibited more excellent Fenton catalytic activity than the Ni-doped Fe3O4, SnS2, and the mixture is composed of the Ni-doped Fe3O4 and SnS2 with the same composition as the composite for the degradation of rhodamine B (RhB). RhB could be removed about 95% in 120 min at natural pH of the RhB solution (6.64) without irradiation for the Ni-doped Fe3O4/SnS2 composite as the catalyst. The present SnS2 enhanced adsorption capacity for RhB and the dispersed nanosized particles of Ni-doped Fe3O4, and the interaction between cations (Fe3+ and Fe2+) and S2− enhanced the conversion from Fe3+ to Fe2+, which induced excellent catalytic activity of the composite.
KeywordsMicrocalorimetry NiFe2O4 SnS2 Catalytic activity Fenton reaction
The authors gratefully acknowledge financial support from the National Nature Science Foundations of China (21673204 and 21273196) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Conflict of interest
The authors declare that they have no conflict of interest.
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