液/固相单一离子吸附体系的动力学预测模型
A KINETIC MODEL FOR ION ADSORPTION IN LIQUID/SOLID SINGLE IONIC SPECIES SYSTEMS
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摘要: 对四种液/固相单一离子吸附体系的动力学研究结果表明:吸附速率不仅随时间变化,也与起始离子浓度(C0)和吸附剂浓度(W0)有关;Lagergren准二级方程在给定的起始离子浓度及吸附剂浓度下具有很高的模拟精确度,但其参数随起始离子浓度和吸附剂浓度的变化而变化,且无法确定其间的函数关系;结合四组分离子吸附模型,提出了新的动力学方程,实验结果表明,新方程具有较高的模拟精确度,其参数与C0和W0具有相对稳定的函数关系,可作为液/固相单一离子吸附体系中给定C0,W0条件下吸附动力学过程的预测模型.Abstract: Kinetic experiments were carried out to test the basic relationship for ion adsorption in liquid/solid single ionic species systems for Zn2+,Cd2+,Cu2+and Cr(Ⅵ),respectively.The obtained results showed that ion adsorption rate depended not only on contacting time but also on initial ion concentration(C0)and adsorbent concentration(W0).Classic kinetic equations were found to fit the experimental data well at given C0 and Wo,but their parameters varied with C0 and W0 at highly significant levels.Based on a four adsorption compo-nents model,a kinetic equation with parameters determined by C0 and W0 was developed.The new model fit the experimental data at relatively high level of accuracy within the tested Co and Wovariation range.Results from repeated tests indicate that the proposed model can be used to describe the kinetic process of ion adsorp-tion in liquid/solid systems.
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Key words:
- ion adsorption /
- kinetic equation /
- liquid/solid system
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