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。
Corsslinking alginate acid was prepared as adsorbent to remove Cu^2＋ from aqueous solution. Three different kinds of kinetic models （ i. e. , Lagergren＇ s pesudo - first - order and Ho＇ s pesudo-second-order equations and intraparticle diffusion model） were used to investigate the adsorption mechanisms. The results indicated that the adsorption behavior fitted Ho＇ s pesudo-second-order equation welt. The adsorption of Cu^2＋ on alginic acid fiber is a complex and heterogeneous chemical adsorption process. Membrane diffusion and intraparticle diffusion both are rate controlling steps. After crosslinking, the adsorbent exhibited longer equtibrium time and lager maximum adsorption quantity. Crosslinking alginic acid is an environmental friendly and cheap adsorbent.
出处
《科学技术与工程》
2010年第4期942-945,共4页
Science Technology and Engineering
基金
山东省自然科学基金(Q2008B04)
国家自然科学基金(50908120)资助
关键词
海藻酸
吸附
CU^2+
交联
alginic acid adsorption Cu^2＋ kinetic models crosslinking
