This study presents the fabrication and characterization of Fe-Mn bimetallic oxide-modified corn stalk biochar (FM@BC) for the removal of Cd(II) from aqueous solutions. The biochar was synthesized via oxygen-limited pyrolysis at 600°C, followed by chemical impregnation with iron and manganese salts. SEM-EDS analysis confirmed successful modification, revealing corroded surfaces with aggregated particles and altered pore structures compared to pristine biochar. Adsorption experiments demonstrated that Cd2+ uptake increased progressively over time, reaching a maximum capacity of 112.5 mg/g. Kinetic modeling indicated that the pseudo-second-order model provided the best fit (R2> 0.99), suggesting chemisorption as the dominant mechanism. Isotherm studies showed that the Langmuir model fitted the data better than the Freundlich model (R2 = 0.984), indicating monolayer adsorption on homogeneous surfaces. Speciation analysis revealed that free Cd2+ ions predominated at pH 8. The bimetallic modification effectively enhanced Cd(II) removal efficiency by overcoming the limitations of unmodified biochar. This cost-effective and environmentally sustainable approach utilizing agricultural waste biomass demonstrates significant potential for remediating Cd-contaminated water and soil, contributing to sustainable environmental management practices.
Li et al. (Tue,) studied this question.
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