Abstract:Two nanoscale zero-valent iron-hydroxyapatite nanocomposites (N-FH and C-FH) with different calcium sources were prepared by liquid-phase reduction method. Through static batch experiments, the effects of solution pH value, reaction time, initial manganese concentration, and reaction temperature on the performance of N-FH and C-FH adsorption of Mn(Ⅱ) in water were studied. Combined with microscopic characterization of composite material before and after adsorption, and the adsorption mechanism was further analyzed by adsorption kinetic model. The results show that the maximum adsorption capacity of Mn(Ⅱ) adsorbed in water by N-FH and C-FH is 59.679 2 mg/g and 59.290 4 mg/g respectively under the conditions including 0.125 g/L of composite material, initial manganese concentration of 10 mg/L, pH value of the solution to be set to 5.0, and reaction time of 720 min,. The adsorption process of Mn(Ⅱ) by N-FH and C-FH is more consistent with the quasi-second-order kinetic model (R2>0.99) and Langmuir model (R2>0.98), and the adsorption mechanism is monolayer chemical adsorption.