【摘要】 考虑到多孔吸附材料纳米级孔隙在吸附钙离子过程中存在的特殊效应,通过比较不同空隙的吸附材料(包括13X沸石、5nm分子筛和4nm分子筛)在超声波和搅拌作用下的吸附效果,进而研究超声波强化吸附传质过程,并对其超声波过程强化机理进行了初步的探讨.结果表明:超声波强化了吸附传质.当吸附剂的孔隙小于吸附水合钙离子粒径时,以颗粒外表面吸附为主,传质过程由膜扩散决定,吸附平衡受热力学平衡控制;当吸附剂的空隙大于吸附水合钙离子粒径时,以颗粒孔隙吸附为主,传质过程由粒内散决定,吸附平衡受纳米孔隙效应和热力学平衡共同作用影响.更多还原

【Abstract】 Considering the special effects of nanometer size in porous adsorbent, the adsorption properties with different adsorption materials (containing 13X zeolite、5 nm zeolite and 4 nm zeolite) under the action of ultrasonic and stirring were studied and compared. Besides, the process intensification mechanism of adsorption mass transfer was analyzed. The results showed that ultrasonic can be employed to enhance the process of adsorption mass transfer. When the pore size of adsorbents was smaller than the size of hydrated calcium ion used as adsorbate, the hydrated calcium ion were mainly adsorbed on the surface of adsorbents, the process of adsorption mass transfer is affected by liquid film diffusion and adsorption equilibrium is affected by thermodynamic equilibrium. However, when the pore size of adsorbents was greater than the size of hydrated calcium ion, the hydrated calcium ion were mainly adsorbed in the pore of adsorbents, the process of adsorption mass transfer was controlled by the influence of both inner-particle diffusion and adsorption equilibrium was affected by combined action of thermodynamic equilibrium and the special effects of nanometer size in porous adsorbent.更多还原