Physicochemical and electrochemical characterization of cation-exchange membranes modified with polyethyleneimine for elucidating enhanced monovalent permselectivity of electrodialysis

电渗析 化学 Zeta电位 电化学 离子交换 介电谱 离子键合 化学工程 微咸水 无机化学 离子强度 离子 分析化学(期刊) 色谱法 盐度 电极 水溶液 有机化学 生物 生物化学 工程类 物理化学 纳米颗粒 生态学
作者
Wenbin Jiang,Lu Lin,Xuesong Xu,Huiyao Wang,Pei Xu
出处
期刊:Journal of Membrane Science [Elsevier BV]
卷期号:572: 545-556 被引量:59
标识
DOI:10.1016/j.memsci.2018.11.038
摘要

Monovalent permselective cation-exchange membrane (CEM) CR671 was developed by coating polyethyleneimine onto the normal grade CEM CR67. Pilot-scale electrodialysis of brackish groundwater demonstrated excellent monovalent permselectivity of the modified CR671 as compared to the normal grade CR67. Advanced analytical approaches were employed to characterize the physicochemical and electrochemical properties of the CEMs to elucidate the mechanisms of permselectivity. Ion-exchange capacities of the CR671 and CR67 were measured to be 2.0 and 2.1 meq/g dry membrane, respectively. Zeta-potential analysis revealed that the CR671 surface was positively charged as a result of polyethyleneimine coating. Electrochemical impedance spectroscopy (EIS) data indicated larger impedance for the CR671 and fitted well to the Maxwell-Wagner model, which provided an equivalent electric circuit for the CEMs, as well as indication of the existence of polyethyleneimine layer. The time constants of different ions transporting through polyethyleneimine modification layer were calculated based on the EIS responses. The results revealed the polyethyleneimine modification layer led to longer transport time for Ca2+ ions through the CR671 than for Na+ ions, supporting the pilot-scale testing results that the CR671 improved the Na+ removal by selectively rejecting Ca2+ ions. However, the difference in ion transport time became less significant with increasing ionic strength of the feed water. The EIS results suggest the monovalent permselectivity decreased during treatment of higher salinity water, supporting the finding that the CR671 exhibited higher monovalent permselectivity during electrodialysis of brackish groundwater than reverse osmosis concentrate in which the salt concentration was 5.7 times higher than the brackish groundwater. This study demonstrates that ion transport time constant is a better indicator for permselectivity of modified ion-exchange membranes than electrical resistance measured by EIS.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
SuperZzz发布了新的文献求助10
1秒前
852应助yixiaolou采纳,获得10
1秒前
星星应助时笙采纳,获得30
1秒前
3秒前
camellia发布了新的文献求助10
3秒前
爱笑若冰发布了新的文献求助10
4秒前
郭富城完成签到,获得积分10
5秒前
hhhblabla应助空古悠浪采纳,获得20
5秒前
射天狼完成签到,获得积分10
5秒前
清爽尔安发布了新的文献求助10
5秒前
7秒前
7秒前
顾矜应助GS11采纳,获得10
8秒前
SuperZzz完成签到,获得积分10
8秒前
李大伟发布了新的文献求助10
10秒前
贾克斯完成签到,获得积分20
10秒前
闾丘剑封发布了新的文献求助10
10秒前
量子星尘发布了新的文献求助30
10秒前
李健应助hanleiharry1采纳,获得10
10秒前
11秒前
科研通AI2S应助Hey采纳,获得20
13秒前
爱笑若冰完成签到,获得积分10
13秒前
tomorrow完成签到 ,获得积分10
14秒前
15秒前
Rei完成签到 ,获得积分20
16秒前
科研通AI2S应助无所谓的啦采纳,获得10
16秒前
田様应助打我呀采纳,获得10
16秒前
17秒前
17秒前
科研狗发布了新的文献求助10
17秒前
yixiaolou发布了新的文献求助10
18秒前
李大伟完成签到,获得积分10
19秒前
慎独完成签到,获得积分10
19秒前
MchemG应助科研通管家采纳,获得10
20秒前
乐乐应助科研通管家采纳,获得10
20秒前
orixero应助科研通管家采纳,获得30
20秒前
SYLH应助科研通管家采纳,获得30
20秒前
CHENG_2025应助科研通管家采纳,获得10
20秒前
小萌发布了新的文献求助10
20秒前
20秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989406
求助须知:如何正确求助?哪些是违规求助? 3531522
关于积分的说明 11254187
捐赠科研通 3270174
什么是DOI,文献DOI怎么找? 1804901
邀请新用户注册赠送积分活动 882105
科研通“疑难数据库(出版商)”最低求助积分说明 809174