Synthesis of a flower-like MoS2/carbon nanocomposite with enhanced adsorption performance toward Eu(iii): the cooperative effects between S atoms and carboxyl groups
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY(2020)
摘要
The hazardous consequences that the radionuclide europium (Eu(iii)) has on humanity and the ecological environment motivate the development of advanced sorbent materials for its efficient removal from wastewater. Herein, a flower-like molybdenum disulfide material fabricated using a carbon composite (MoS2/C) was successfully prepared via an in situ hydrothermal method and confirmed using various experimental characterization methods (scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy). It was found that the MoS2/C composite exhibits a 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) due to the cooperative effects between the S atoms of MoS2 and carboxyl groups of the carbon material, which were confirmed from X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations. Besides this, the MoS2/C exhibited a high adsorption rate with a short equilibrium time (120 min) and a wide pH operating range (4.0-9.0). This study reveals that the MoS2/C composite can be employed as an auspicious candidate for Eu(iii) removal and expands the realm of possibilities of using MoS2-based materials in the field of eliminating radionuclides from wastewater.
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