Abstract
Abstract The magnetic porous silica–graphene oxide hybrid composites (Fe3O4@mSiO2/GO) were synthesized via grafting graphene oxide sheets onto the core–shell Fe3O4@mSiO2 nanoparticles, and their application in removing p-nitrophenol from aqueous solution was also investigated. The as-prepared Fe3O4@mSiO2/GO composites were characterized by transmission electron microscopy, fourier-transform infrared spectroscopy, nitrogen adsorption–desorption isotherms and vibrating sample magnetometer. The adsorption kinetics, adsorption isotherms, adsorption thermodynamics and influence of solution pH were discussed. The experimental results indicated that the adsorption process was well fitted by the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity was 1548.78 mg/g at the solution pH 8.0 and at 25 °C. The Fe3O4@mSiO2/GO hybrid composites could be easily separated from solutions through an external magnetic force. Undoubtedly the Fe3O4@mSiO2/GO hybrid composites might have a bright future in removing organic pollutants from wastewater.
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