【摘 要】
：
制备了交联海藻酸,从静态吸附方面研究了海藻酸交联前后对Cu~(2+)的吸附性能。用三种动力学模型(准一级动力学方程,准二级动力学方程,粒子扩散方程)对不同Cu~(2+)浓度、不同
【机 构】
：
青岛大学纤维新材料与现代纺织国家重点实验室培育基地,清华大学化学工程系,
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制备了交联海藻酸,从静态吸附方面研究了海藻酸交联前后对Cu~(2+)的吸附性能。用三种动力学模型(准一级动力学方程,准二级动力学方程,粒子扩散方程)对不同Cu~(2+)浓度、不同吸附时间的吸附曲线进行分析,探讨了吸附剂的吸附机理。结果表明准二级动力学模型的拟合度较好,海藻酸吸附Cu~(2+)是一个复杂的非均相扩散的化学吸附过程,表面络合和吸附剂内部扩散共同控制着吸附速率。交联后吸附的平衡时间延长,吸附量增大。交联后的海藻酸是一种价格低廉,绿色环保的吸附剂。
The crosslinked alginic acid was prepared. The adsorption of Cu 2+ on alginate was studied from static adsorption. The adsorption curves of different concentrations of Cu 2+ and different adsorption time were analyzed by three kinetic models (quasi-first-order kinetic equation, quasi-second-order kinetic equation and particle diffusion equation), and the adsorption of adsorbent mechanism. The results show that the quasi-second-order kinetic model has a good fitting degree. Cu 2+ adsorbed by alginic acid is a complicated chemical adsorption process with heterogeneous diffusion. The surface complexation and internal diffusion of adsorbent jointly control the adsorption rate . The equilibrium time of adsorption after crosslinking prolongs and the amount of adsorption increases. After the crosslinking of alginic acid is a cheap, environmentally friendly adsorbent.
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