Preparation of Fe-doped Biochar and Its Adsorption Performance for Ni2+and Co2+Metal Ions
The Fe-doped magnetic biochar FSBCx-y was prepared via high temperature pyrolysis at 800℃ with Fe-doped carbon precursor as raw material.The Fe-doped carbon precursor was made via co-hydrothermal method with aloe green skin as carbon source and FeSO4 as Fe source.The as-made FSBCx-y was characterized by BET、SEM、FTIR、Zeta and XPS,and its application for adsorption of Ni2+and Co2+in waste water was investigated.The result showed that the FSBCx-y has a hierarchical porous structure with a lamellar-like surface with many small flakes.When the mass ratio of aloe green skin to FeSO4 was 3∶1,the specific surface area of the as-made FSBC3-1 is 82 m2·g-1,and the total pore volume is 0.10 cm3·g-1.The surface of FSBC3-1 is rich in active groups of O,S and Fe,which can react with Ni2+and Co2+through ion exchange,electrostatic adsorption,complexation,co-precipitation and electrostatic adsorption.The adsorption isotherm and adsorption kinetics were more consistent with Langmuir model and pseudo-second-order kinetic model.According to the Langmuir model,the theoretical maximum ad-sorption capacities of Ni2+and Co2+by FSBC3-1 are 136.43 mg·g-1 and 132.10 mg·g-1 respectively,which are mainly chemical adsorption.Fixed bed experiment results show that FSBC3-1 has the high dynamic adsorption capacity for metal ions.
inorganic non-metallic materialsmagnetic biocharaloe vera green skinFe dopemetal ionschemical adsorption
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