Synthesis and photoelectrocatalytic performance of Sb2S3 nanorods from natural stibnite

Abstract

Antimony trisulfide (Sb₂S₃) nanorods were successfully synthesized via hydrothermal method with the assistance of polyethylene glycol (PEG) and N,N-dimethylformamide (DMF), using natural stibnite as precursor. The effects of experimental parameters on the morphology and the properties of the obtained Sb₂S₃ were systematically studied, and the possible formation mechanism of Sb₂S₃ nanorods in the preparation process was also discussed. Phase, compositions, morphology and photoelectric properties of the products were investigated by a series of characterization methods. The photocatalytic activity of nano Sb₂S₃ on the degradation of methyl orange were investigated under the visible light irradiation. The results showed that the Sb₂S₃ nanoflakes formed after hydrothermal synthesis at 160℃ for 12 h, and the nanoflakes would transform into nanorods eventually after N₂-annealing at 400℃ for 1 h. The obtained Sb₂S₃ nanorods with a single crystal structure are typically 2~3 μm in length, 100~200 nm in width, which are direct semiconductor with band gap of 1.66 eV. Photocatalytic degradation rate of the obtained Sb₂S₃ nanorods on methyl orange under visible light irradiation is higher than that of commercial Sb₂S₃, which is up to 87.6% after 60 min degradation, exhibiting obvious visible-light activity.

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