离子取代凝胶——ACA离子取代动力学模型

ION REPLACEMENT GEL:ION REPLACEMENT KINETICS MODEL OF ACA

用动边界模型描述了海藻酸 壳聚糖 海藻酸 (ACA)离子取代凝胶对 2价离子的取代动力学过程 .模型具有较好的可靠性 ,ACA离子取代凝胶对 2价离子的取代属于颗粒扩散控制 .ACA离子取代凝胶对Pb2 + 的反应级数是 0 76 .

ACA ion replacement gel is a novel ion adsorbent and is hopeful to be used to cure human toxicosis metallicus. In this paper the ion replacement kinetics process of Alginate Chitosan Alginate(ACA) and the mutual replacement process of Calcium Alginate(A Ca) and Alginate Chitosan Alginate Calcium(ACA Ca) gel beads for Pb 2+ are studied by mobile boundary model. The model has high reliability. The ion replacement process is controlled by Particle Diffusion Control (PDC). The apparent diffusion coefficient is higher with increasing concentration of Pb 2+ and is linearly related to R -2 . The reaction order of ACA for Pb 2+ is 0 76.