Abstract
The Co9S8 Hexagonal Sheets (HSs) with an average side length of approximately 1 μm have been successfully prepared by a one-step hydrothermal route. XRD, FESEM, XPS, BET and UV–Vis spectra were used to analyze the crystal structure, morphology, surface element states, specific surface area and optical properties of the products. An SRS (Hexagonal Sheets-Hexagonal Rings-Hexagonal Sheets) growth mechanism of Co9S8 HSs was proposed based on the Kirkendall effect. The formation of Co9S8 HSs attributed to the gradual diffusion of Co2+ outward from the inner and S2- from outside into the core. The Co9S8 HSs exhibited excellent photocatalytic activity to degrade Rhodamine B (RhB) due to the larger specific surface area (13.74 m2/g) and lower band-gap (1.28 eV). The degradation rate of RhB (25 mg/L) reached 95 % in 60 min for Co9S8 HSs. After four cycles of degradation, the degradation rate can reach up to 90 %, indicating that Co9S8 HSs have good reusability. Furthermore, given radical quenching experiments and photocatalytic reactions, the degradation mechanism of Co9S8 HSs was also analyzed in detail. This work may enlighten the design and fabrication of nanomaterials for various applications.
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