Abstract:Nano-zero-valent iron - hydroxylapatite coated steel slag (S-FH) was prepared by liquid-phase reduction method. Microstructure of Fe0-HAP before and after loaded was analized. Effects of pH value, dosage of S-FH, reaction time, and initial concentration of manganese on adsorption of manganese with S-FH were investigated. The adsorption mechanism was further analyzed using adsorption kinetic model and adsorption isotherm model. The results show that the best adsorption effect is obtained under the conditions including initial concentration of Mn of 5 mg/L, pH value of 5, dosage of S-FH of 0.1 g, and reaction time of 300 min. The adsorption of Mn by S-FH is more consistent with the Freundlich sorption isotherm model (R2>0.98) and quasi-second order kinetic model (R2>0.99). The adsorption mechanism is ion exchange, surface complexation, and dissolution-precipitation.