Magnetic Fe2O3/biochar composite prepared by hydrothermal method for Cu2+ removal in water

Abstract

In this study, pureed water caltrop shell is used as the raw, and magnetic biochar composite is prepared by co-hydrothermal of water chestnut Trapa and FeCl₃.6H₂O. XRD, EDX, SEM, FT-IR, N₂-isothermal adsorption and desorption, and scanning electron microscope (SEM) techniques showed the successful synthesis of  Fe₂O₃/Biochar composite. Synthesizing the material by hydrothermal method created Fe₂O₃ to cover the biochar surface. The presence of Fe₂O₃ has significantly increased the surface area of the magnetic biochar material, which is conducive to the recycling of biochar. Cu²⁺ removal efficiency reached 89,96% at concentration of 50mg/L and pH 6. The Cu²⁺ adsorption process follows the Langmuir isotherm adsorption model and the second-order kinetic model. The results show that this low-cost magnetic biochar is capable of removing Cu²⁺ from aqueous solution quickly and effectively.