▎ 摘　　要

The Mg(OH)2/graphene oxide (MHG) nanocomposite was constructed through a facile precipitation method under room temperature. The products were characterized systematically. Results revealed that lamellar Mg (OH)2 nanoparticles have anchored on graphene oxide (GO) successfully. The as-synthesized MHG possessed high specific area of 420.1 m2/g and mesoporous structure, which make it an excellent adsorbent for methylene blue (MB). Freundlich model and pseudo-second-order kinetics model could be used to described the adsorption isotherm and adsorption kinetics perfectly. The thermodynamics parameters revealed the adsorption process was endothermic and spontaneous. Moreover, the resultant MHG nanocomposite was further incorporated into poly (vinyl alcohol) (PVA) to investigate its flame-retardancy for the first time. The limiting oxygen index (LOI) test, UL-94 test and microscale combustion calorimetry (MCC) results indicated that MHG was effective flame retardant for PVA. The TGA result suggested the MHG could improve the stability of PVP effectively. The assynthesized MHG holds promise to be used as adsorbent in removing contaminants from waste water and flame-retardant for polymers.