Abstract:Composite material of steel slag loaded with hydroxyapatite was prepared by sol-gel method with steel slag as carrier. Effects of pH value, adsorbent dosage, reaction time and initial uranium concentration on adsorption of U(VI) in aqueous solution were investigated by static test. The results show that this material has better removal property of U(VI). The results show that removal rate of U (VI) in aqueous solution with initial concentration of 5 mg/L is nearly 100% with adsorption capacity of 1.25 mg/g under the conditions of pH=4, dosage of 0.4 g and reaction time of 120 min. Adsorption process of U(VI) on composite is chemical adsorption which is more in line with quasi-second-order kinetic model (R2=0.996 9). Langmuir adsorption isotherm model (R2=0.999 1) shows that adsorption process is monolayer adsorption on surface of adsorbent, and the RL (RL<0.063) calculation shows that adsorption of U (VI) on composite is very close to irreversible adsorption.