Adsorption of As(III) from aqueous solution based on porous magnetic/chitosan/ferric hydroxide microspheres prepared via electrospraying

作者：Vu Dinhthao; Li Xiang^*; Wang Ce

来源：Science China Chemistry, 2013, 56(5): 678-684.

DOI：10.1007/s11426-012-4817-1

• adsorption
• electrospraying
• magnetic materials
• chitosan
• arsenic

Porous chitosan(CS)/magnetic(Fe3O4)/ferric hydroxide(Fe(OH)(3)) microsphere as novel and low-cost adsorbents for the removal of As(III) have been synthesized via the electrospraying technology by a simple process of two steps. Characterization of the obtained adsorbents was studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The adsorption kinetics and equilibrium isotherms were investigated in batch experiments. The Langmuir, Freundlich isotherm and pseudo-second order kinetic models agree well with the experimental data. The adsorption of As(III) onto CS/Fe3O4/Fe(OH)(3) microspheres occurred rapidly and reached adsorption equilibrium after about 45 min. The maximum adsorption capacity of CS/Fe3O4/Fe(OH)(3) microspheres, calculated by the Langmuir isotherm model, was 8.47 mg g(-1), which is higher than that of CS/Fe3O4/Fe(OH)(3) prepared by the conventional method (4.72 mg g(-1)). The results showed that the microspheres had a high adsorption capacity for As(III) and a high separation efficiency due to their microporous structure and superparamagnetic characteristics. Present research may eventually lead to a simple and low cost method for fabricating microporous materials and application for removal of arsenic from aqueous solution.

• 出版日期2013-5
• 单位吉林大学