▎ 摘　　要

A one-step, eco-friendly strategy is developed to prepare sulfur/reduced graphene oxide nanohybrid (SRGO) (sulfur nanoparticles of average size similar to 20 nm) using the combined effect of the polyphenolic compounds and acids present in Citrus limon juice. The prepared nanohybrid is characterized with Fourier transform infrared, Raman spectroscopy, X-ray diffraction, and transmission electron microscopy. The detailed plausible mechanism of the simultaneous reduction of graphene oxide and formation of sulfur nanoparticles is also established. The nanohybrid demonstrated a fast and efficient Hg2+ removal at around pH 6-8. The adsorption kinetics followed pseudosecond-order and the isotherm could be well described by the Langmuir model. The thermodynamic parameters (Delta G(0), Delta S-0, and Delta H-0) are calculated from the temperature-dependent isotherms and indicate that the adsorption process is endothermic and spontaneous. The nanohybrid also has excellent reusability and high selectivity of Hg2+. Therefore, this nanohybrid has use as a promising toxic Hg2+ adsorbent.