Synthesis of flower-like MoS2/carbon nanocomposite with enhanced adsorption performances toward Eu(III): the cooperative effects between S atoms and carboxyl groups
The hazardous consequences of radionuclide europium (Eu(III)) to humanity and ecological environment motivate the development of advanced sorbent materials for its efficient removal from wastewater. Herein, a flower-like molybdenum disulfide material fabricated with carbon composite (MoS2/C) was successfully prepared by situ hydrothermal method and confirmed by various experimental characterizations (scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR)). It was found the MoS2/C composite behaved much higher sorption capacity (100.57 mg·g-1, pH 5.0, 298 K) towards Eu(III) than that of pristine MoS2 (32.52 mg·g-1 , pH 5.0, 298 K) by reason of the cooperative effects between S atoms of MoS2 and carboxyl groups of carbon material, which have been confirmed by X-ray photoelectron spectroscopy (XPS) and the density functional theory (DFT) calculations. Besides, the MoS2/C exhibited high adsorption rate with short equilibrium (120 min) and a wide pH operating range (4.0-9.0). This study reveals the MoS2/C composite can be employed as an auspicious candidate for Eu(III) removal and expands the realm of possibilities of MoS2 based materials in the field of eliminating radionuclide from wastewater.