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[1]刘文强,陈雪方,杨刚,等.二价/单价阳离子混合体系的纳滤过程[J].南京工业大学学报(自然科学版),2013,35(04):53-57.[doi:10.3969/j.issn.1671-7627.2013.04.011]
 LIU Wenqiang,CHEN Xuefang,YANG Gang,et al.Nanofiltration of mixed salt solution with monovalent and divalent cations[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2013,35(04):53-57.[doi:10.3969/j.issn.1671-7627.2013.04.011]
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二价/单价阳离子混合体系的纳滤过程()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
35
期数:
2013年04期
页码:
53-57
栏目:
出版日期:
2013-07-01

文章信息/Info

Title:
Nanofiltration of mixed salt solution with monovalent and divalent cations
文章编号:
1671-7627(2013)04-0053-05
作者:
刘文强陈雪方杨刚邢卫红徐南平
南京工业大学 材料化学工程国家重点实验室,江苏 南京 210009
Author(s):
LIU WenqiangCHEN XuefangYANG GangXING WeihongXU Nanping
State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China
关键词:
纳滤 分离因子 荷电密度 介电常数
Keywords:
nanofiltration separation factor charge density dielectric constant
分类号:
TQ028.8
DOI:
10.3969/j.issn.1671-7627.2013.04.011
文献标志码:
A
摘要:
采用DK膜对(Mg2+、K+、Cl-)、(Ca2+、Na+、Cl-)三元离子混合体系进行分离实验,通过道南细孔-介电(DSPM-DE)模型对其分离性能进行评价。结果表明:料液中二价阳离子与单价阳离子浓度比越大,分离因子(SF)越小,越有利于分离; 操作压力的增加亦能提高DK膜的分离能力,即SF随压差或渗透流率增加而减小,最后趋于稳定,存在一个极限SF。模型分析发现膜荷电密度(Xd)及孔内介电常数(εp)不仅与离子浓度有关,还与离子类型有关,且Xdεp均随二价阳离子含量增加而单调减小; 而SFXdεp的减小而减小,证实了Xdεp的大小直接决定二价阳离子与单价阳离子分离效果。
Abstract:
Mixed salt solutions containing three species of ions(Mg2+,K+,Cl-)and(Ca2+,Na+,Cl-)were filtrated with a commercially available DK nanofiltration membrane.The Donnan-steric pore model and dielectric exclusion(DSPM-DE)model was implemented to evaluate the separation performance.The results revealed that the higher the ratio of divalent cations to monvalent cations was,the better the facilitated separation of them was.The separation performance was also improved when working pressure or permeate flux was increased,and there was a limiting separation factor(SF).Model analysis showed that membrane charge density(Xd)and dielectric constant(εp)within the pores depended on ion concentration and type(value and sign).Xd and εp decreased monotonously with increasing divalent cation concentration.Separation efficiency of divalent and monvalent cations directly depended on Xd and εp,which was confirmed by the fact that SF decreased with the decreasing Xd and εp.

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备注/Memo

备注/Memo:
收稿日期:2012-06-04
基金项目:江苏省科技厅产学研前瞻性联合研究项目(BY2009106); 国家自然科学基金(20576052)
作者简介:刘文强(1985—),男,湖北安陆人,硕士,主要研究方向为膜分离; 杨刚(联系人),教授, E-mail: yanggang@njut.edu.cn..
更新日期/Last Update: 2013-07-07