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DOI | 10.1021/acs.est.8b04268 |
Improving Ion Rejection of Conductive Nanofiltration Membrane through Electrically Enhanced Surface Charge Density | |
Zhang, Haiguang1; Quan, Xie1; Fan, Xinfei1; Yi, Gang1; Chen, Shuo1; Yu, Hongtao1; Chen, Yongsheng2 | |
发表日期 | 2019 |
ISSN | 0013-936X |
EISSN | 1520-5851 |
卷号 | 53期号:2页码:868-877 |
英文摘要 | Nanofiltration (NF) is considered a promising candidate for brackish and seawater desalination. NF exhibits high multivalent ion rejection, but the rejection rate for monovalent ions is relatively low. Besides, great challenges remain for conventional NF membranes to achieve high ion rejection without sacrificing water flux. This work presents an effective strategy for improving the ion rejection of conductive NF membrane without decreasing the permeability through electrically assisted enhancement of surface charge density. When external voltage is increased from 0 to 2.5 V, the surface charge density of the membrane increases from 11.9 to 73.0 mC m(-2), which is 6.1X higher than that without external voltage. Correspondingly, the rejection rate for Na2SO4 increases from 81.6 to 93.0% and that for NaCl improves from 53.9 to 82.4%; meanwhile, the membrane retains high permeabilities of 14.0 L m(-2) h(-1) bar(-1) for Na2SO4 filtration and 14.5 L m(-2) h(-1) bar(-1) for NaCl filtration. The Donnan steric pore model analysis suggests that the Donnan potential difference between the membrane and bulk solution is increased under electrical assistance, leading to increased ion transfer resistance for improved ion rejection. This work provides new insight into the development of advanced NF technologies for desalination and water treatment. |
WOS研究方向 | Engineering ; Environmental Sciences & Ecology |
来源期刊 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/92116 |
作者单位 | 1.Dalian Univ Technol, Minist Educ, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China; 2.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA |
推荐引用方式 GB/T 7714 | Zhang, Haiguang,Quan, Xie,Fan, Xinfei,et al. Improving Ion Rejection of Conductive Nanofiltration Membrane through Electrically Enhanced Surface Charge Density[J],2019,53(2):868-877. |
APA | Zhang, Haiguang.,Quan, Xie.,Fan, Xinfei.,Yi, Gang.,Chen, Shuo.,...&Chen, Yongsheng.(2019).Improving Ion Rejection of Conductive Nanofiltration Membrane through Electrically Enhanced Surface Charge Density.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(2),868-877. |
MLA | Zhang, Haiguang,et al."Improving Ion Rejection of Conductive Nanofiltration Membrane through Electrically Enhanced Surface Charge Density".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.2(2019):868-877. |
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