The Synthesis And Dye Adsorption Property Of Magnetic Nanomaterial

Dye wastewater pollution is one of the severest environmental problems in the world.It is highly desired to develop novel dye pollutant treatment technology.Up to date,adsorption is the most commonly used method for wastewater treatment due to its high efficiency,simple operation and low cost.In recent years,much attention has been focused on magnetic nanomaterials due to their high surface areas,excellent chemical stabilities and controllable magnetic characteristics.The exceptional properties of magnetic nanomaterials make them be the promising materials for applications in adsorbents.Compared to traditional adsorbents,magnetic nanomaterial adsorbents have more advantages,such as high adsorption capacity,easy magnetic separation and no secondary pollution.However,many magnetic nanomaterial adsorbents demonstrate charge and pH dependent adsorption characteristics,which greatly restrict their large practical applications.In this study,CoFe₂O₄?CFO?and C/CoFe₂O₄?C/CFO?magnetic nanoparticles are prepared and the physiochemical properties are then characterized.Adsorption behaviors of CFO and C/CFO magnetic nanoparticles for both cationic?Methylene Blue?and anionic?Congo Red?dyes are conducted,where the effects of pH,initial dye concentration and contact time are studied.The adsorption isotherms and kinetics of C/CFO magnetic nanocomposite are further analyzed,as well as the adsorption mechanism.The results demonstrate that both CFO and C/CFO magnetic nanoparticles have high surface areas and porous structures.Meanwhile,C/CFO nanocomposite shows larger particle size,higher crystallinity and stronger saturation magnetization.The equilibrium adsorption data of Methylene Blue and Congo Red on C/CFO nanocomposite are fitted well to the Langmuir isotherm model,yielding the maximum monolayer adsorption capacity of 42.06mg/g and 263.174 mg/g,respectively.Adsorption kinetics is best described by the pseudo-second-order model.The adsorption of dyes onto C/CFO nanocomposite is not dependent on the solution pH and FTIR results show that the main adsorption mechanism is associated with?-?stacking interaction.In a word,C/CFO magnetic nanocomposite shows high adsorption properties for both cationic?Methylene Blue?and anionic?Congo Red?dyes in a wide solution pH range?3-11?.The efficient dye removal and easy magnetic separation characteristics will make C/CFO magnetic nanocomposite be a promising adsorbent for the removal of both cationic and anionic dyes from water.