High Efficient Adsorption of Indigo Carmine with Carbon Coated Porous Magnesium Oxide
In this study,thin carbon coated porous magnesium oxide composites were synthesized with two steps,including one-pot hydrothermal and high temperature calcination.The composites were subsequently characterized by XRD,FT-IR,SEM,TEM,and EDS.The influences of different adsorption conditions on the removal efficiency of indigo carmine dye were also investigated.The adsorption process was simulated by isothermal thermodynamics and adsorption kinetics.The experimental results showed that the lamellar porous magnesium oxide was covered by a thin carbon layer with n(MgCl2)∶n(C6H12O6)=5∶2.The formed composites was homogeneous and stable.The hydrothermally synthesized layered magnesium hydroxide was transformed into porous magnesium oxide after calcination,and the particle size decreased along with larger specific surface area.The results of adsorption experiments showed that the composites exhibited ex-cellent adsorption performance to the anionic dye indigo carmine in aqueous solution,and the adsorption was less affected within the range of 5～75 g/L NaCl concentration and pH 2～10.The adsorption capacity of the carbon coated porous magnesium oxide composites for indigo carmine was still as high as 983.95 mg/g even after 10 cycles.The adsorption of indigo carmine by the composites could be fitted by both the Langmuir isothermal thermodynamic model and the pseudo-second-order kinetic model.
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维普
