太原理工大学学报2023，Vol.54Issue(4)：609-618,10.DOI:10.16355/j.cnki.issn1007-9432tyut.2023.04.004
电控离子选择渗透膜分离过程传质模型的构建
Development of Mass Transfer Model of Electrochemically Switched Ion Permselective Membrane Separation Process
摘要
Abstract
[Purposes]Electrochemically switched ion permselective(ESIP)is a novel ion se-lective membrane separation technology,which has been applied for the efficient,continuous and selective separation of low-concentration target ions.However,the ion transfer in the ESIP membrane is disobedient to the Nernst-Planck theory,and the development of mass transfer model of ESIP contributes to the understanding of ESIP separation process.[Methods]In the ES-IP membrane separation system,a modified Nernst-Planck model was proposed to study the mass transfer behavior in the dynamic field coupled with the double pulse potential on the mem-brane and the cell voltage on the electrode compartment.According to Donnan equilibrium and electroneutrality hypothesis,the steady state model of ion transfer in ESIP membrane separation process was established.The effects of current density,membrane thickness and ionic active site concentration on ion concentration and resistance distribution in membrane separation system were investigated by numerical simulation.[Findings]The results show that in the diffusion lay-er of feed solution and the membrane phase,the membrane thickness and the ionic active site concentration have great influence on the ion concentration distribution,and reducing the mem-brane thickness and increasing the ionic active site concentration are the main ways to improve the ion mass transfer.Under the influence of high current density,thin membrane and ionic active site concentration,resistance in the diffusion layer of feed solution plays a dominant role in the o-verall resistance,and the ion mass transfer rate can be increased by increasing the flow rate or de-creasing the chamber thickness.[Conclusions]At low current density and thick membrane,the resistance of Donnan layer plays a dominant role,and the ion mass transfer rate is improved by increasing the ionic active sites of the membrane.关键词
电控离子选择渗透膜分离/离子传质/数值模拟/浓度分布/电阻分布Key words
Electrochemically switched ion permselective membrane/ion mass transport/nu-merical simulation/concentration distribution/resistance distribution分类
化学化工引用本文复制引用
高凤凤,张雪锋,张忠林,郝晓刚..电控离子选择渗透膜分离过程传质模型的构建[J].太原理工大学学报,2023,54(4):609-618,10.基金项目
国家自然科学基金资助项目(22108188,U20A20141) （22108188,U20A20141）
