Synthesis of a hierarchical SnS₂ nanostructure for efficient adsorption of Rhodamine B dye

Using Sn²⁺ instead of Sn⁴⁺ as Sn source, H₂O₂ as oxidizer, and l-cysteine as sulphur source and structure-directing agent, hierarchical SnS₂ nanostructure built with the thickness of 10nm nanosheets was successfully synthesized by a green hydrothermal process. The morphology and structure of the products were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) with energy-dispersive X-ray spectrometer (EDS) and Elemental mapping, Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The as-prepared nanostructured SnS₂ nanomaterials were tested for adsorption of Rhodamine B (RhB) from aqueous solution. The effects of contact time, adsorbent dosage and initial concentration were investigated in detail. The adsorption kinetic data were well fitted to the pseudo-second-order model and the equilibrium adsorption data were well described by the Langmuir isotherm model, with a maximum capacity of 200.0mgg^-1. This study provides a novel approach to obtain metal sulfide nanostructures using low-valence metal salts.