Nanofiltration membranes with ion-induced swelling for elevated water permeance in water treatment

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-06-07 DOI:10.1016/j.watres.2025.123979

Chenyi Fang , Muhammad Avicenna Naradipa , Yuewen Jia , Junyu Mi , Haoze Zeng , Joseph Imbrogno , Tim M. Swenson , Chenhao Yi , Shipeng Sun , Andrivo Rusydi , Sui Zhang

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Abstract

Nanofiltration (NF) membranes are widely used in water treatment and desalination. One commonly observed limitation of these membranes is the reduced water permeance in the presence of salts. Here, we introduce diol-based solvents into interfacial polymerization (IP) to form polyamide-type NF membranes. The high viscosity and low surface tension of the solvents reduced the concentration of piperazine (PIP) at the interface, resulting in membranes with a reduced thickness (82.7 to 30.2 nm), lower surface roughness (20.9 to 6.2 nm) as well as higher water permeance (11.1 to 21.0 L.m⁻².h⁻¹.bar⁻¹) compared to original NF membrane, without significantly sacrificing salt rejection ability (97.0 % rejection to Na₂SO₄). More interestingly, the crosslinking degree of the polyamide layer prepared by diol-based solvents was lower, giving rise to higher charge density and swelling in salt solutions. Thus, higher water permeance in treating saline water was observed, and the membranes demonstrated effective separation of organic molecules from salts at elevated water permeance and lower fouling extent in concentrating antibiotics from the realistic pharmaceutical wastewater stream.

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在水处理中，用离子诱导膨胀的纳滤膜提高水透性

纳滤膜广泛应用于水处理和海水淡化。这些膜的一个常见的限制是在盐的存在下水的渗透性降低。在这里，我们将二醇基溶剂引入到界面聚合（IP）中，形成聚酰胺型NF膜。溶剂的高粘度和低表面张力降低了界面处哌嗪（PIP）的浓度，导致膜厚度减少（82.7至30.2 nm），表面粗糙度降低（20.9至6.2 nm），透水性提高（11.1至21.0 L.m−2.h−1.bar−1），而对Na2SO4的截留率为97.0%)没有显著降低。更有趣的是，二醇基溶剂制备的聚酰胺层的交联度较低，在盐溶液中产生较高的电荷密度和肿胀。因此，在处理含盐水时观察到较高的水透性，并且在高水透性的情况下，膜可以有效地从盐中分离有机分子，并且在实际制药废水中浓缩抗生素时污染程度较低。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.