Preparation of a Fe₃O₄@C magnetic materials with high adsorption capacity of methylene blue

Abstract

With sugarcane bagasse as the carrier and iron chloride hexahydrate (FeCl₃·6H₂O) as the iron source, Fe₃O₄@C materials were prepared in this study. Then the adsorption properties of the prepared adsorbents were characterized by XRD, SEM and VSM analysis. The effects of adsorption time, initial pH value and initial methylene blue concentration on methylene blue adsorption performance were studied and the adsorption mechanism was discussed. The Fe₃O₄@C materials synergistically exerted the good adsorption capacity and magnetic properties. The adsorption process of methylene blue on Fe₃O₄@C adsorbent was in accordance with Freundlich isothermal equation and quasi-second-order kinetic model. The saturated adsorption capacity in the experiment of Fe₃O₄@C material was 270.51 mg/g. The adsorption capacity was high in both acidic and alkaline environments, especially the alkaline environment.

Keywords:

• Sugarcane bagasse
• Fe₃O₄@C material
• methylene blue
• adsorption

Additional information

Funding

This project was financially supported by the National Natural Scientific Foundation of China (Nos. 41673109, 41977289), S&T Department of Sichuan Province (2017SZ0185, 2018SZDZX0022 and 2019ZDZX0025), Sichuan Vanadium&Titanium Industry Development Research Center (2018VTCY-Z-02) and the Open Research Fund of 405 Geological Team of Sichuan Geological & Mineral Exploration & Development Bureau.