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用凝胶一支撑沉淀法制备了TiO_2,TiO_2-Fe_2O_3,TiO_2-SiO_2三种金属氧化物微球。测定了它们的的物理特性。研究了在制备时不同的热处理温度对微球吸附海水中微量铀的容量和速度的影响研究表明微球对铀的吸附是由粒子扩散控制的。扩散系数随热处理温度增加而上升。计算出吸附反应的级数在1.9—3.6之间。
Three metal oxide microspheres of TiO 2, TiO 2 -Fe 2 O 3 and TiO 2 -SiO 2 were prepared by gel-supported precipitation method. Their physical properties were measured. The effect of different heat treatment temperature on the capacity and velocity of micro-sized uranium adsorbed in microspheres was studied. The results show that the adsorption of uranium by microspheres is controlled by particle diffusion. The diffusion coefficient increases with the increase of heat treatment temperature. The number of adsorption reactions was calculated to be between 1.9 and 3.6.