Journal of Membrane Science Letters最新文献

英文中文

Decoupling solvent features to address spurious correlations in ceramic Organic Solvent Nanofiltration membranes 解耦溶剂特征，以解决陶瓷有机溶剂纳滤膜中的虚假相关性

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2026-01-21 DOI: 10.1016/j.memlet.2026.100111

Wout Linsen , Pieter-Jan Piccard , Jef Hooyberghs , Anita Buekenhoudt

Organic Solvent Nanofiltration has emerged as an energy-efficient alternative to traditional thermal methods; yet its widespread implementation is hindered by its poorly understood transport mechanism. Improving the prediction of membrane flux and retention is therefore essential, which has recently been primarily advanced through data-driven modeling. Prediction and interpretation of organic solvent nanofiltration transport, however, are complicated by the collinearity between solvent size and Hansen solubility, as they are dependent on one another for common organic solvent nanofiltration solvents. Considering both solvent size and solubility are known to correlate strongly with flux, the collinearity of these properties obscures the impact of either of them. We break this collinearity by performing flux measurements on outlier solvents in unmodified and methyl-grafted ceramic membranes at room temperature. Breaking collinearity is achieved using propylene carbonate and glycerol-water mixtures, whose molecular size and solubility (at room temperature) significantly deviate from the trend established by common organic solvent nanofiltration solvents. To quantitatively identify the true driver of flux for each membrane separately, linear models using either solvent kinetic diameter, molar volume, or Hansen solubility as predictors are compared using statistical tests. Our analysis indicates that molecular size (specifically, the squared reciprocal kinetic diameter) is the true predictor of flux for unmodified and methyl-grafted titania membranes separately, while molar volume and Hansen solubility add no further predictive power. This method can be extended to, e.g., investigate membrane and temperature dependence. Decoupling solvent size and Hansen solubility can help improve the understanding of organic solvent nanofiltration transport and, via dimensionality reduction, aid the development of data-driven modeling.

有机溶剂纳滤已成为传统热方法的节能替代方案；然而，由于人们对其运输机制知之甚少，它的广泛实施受到了阻碍。因此，改进膜通量和保留的预测是必不可少的，最近主要通过数据驱动的建模来推进。然而，有机溶剂纳滤输运的预测和解释由于溶剂粒度和汉森溶解度之间的共线性而变得复杂，因为它们相互依赖于常见的有机溶剂纳滤溶剂。考虑到已知溶剂大小和溶解度与通量密切相关，这些性质的共线性掩盖了它们任何一个的影响。我们通过在室温下对未改性和甲基接枝陶瓷膜中的异常溶剂进行通量测量来打破这种共线性。使用碳酸丙烯酯和甘油-水混合物可以打破共线性，其分子大小和溶解度（在室温下）明显偏离普通有机溶剂纳滤溶剂所建立的趋势。为了定量地确定每种膜通量的真正驱动因素，使用溶剂动力学直径、摩尔体积或汉森溶解度作为预测因子的线性模型使用统计测试进行比较。我们的分析表明，分子大小（特别是平方倒数动力学直径）是未修饰和甲基接枝二氧化钛膜通量的真正预测因子，而摩尔体积和汉森溶解度没有进一步的预测能力。这种方法可以扩展到，例如，研究膜和温度的依赖性。解耦溶剂尺寸和汉森溶解度可以帮助提高对有机溶剂纳滤传输的理解，并且通过降维，有助于数据驱动模型的发展。

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引用次数: 0

Fabrication and property modification of free-standing PSS/PDADMAC ultra- and microfiltration membranes by incorporating cellulosic additives 加入纤维素添加剂的独立式PSS/PDADMAC超、微滤膜的制备及其性能改性

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-11-06 DOI: 10.1016/j.memlet.2025.100110

Ang Zhao , Lea Erbacher , Prasath Paskaran , Matthias Wessling

In classical membrane fabrication, water-soluble additives such as polyvinylpyrrolidone (PVP) have been pivotal in generating porosity and tuning surface properties. By contrast, comparable modifiers for membranes produced via all-aqueous processes – such as polyelectrolyte complex (PEC) membranes – remain largely unexplored. Here, we demonstrate that hydroxyethyl cellulose (HEC) and hydroxypropyl cellulose (HPC) act as effective pore formers and structural modifiers in PEC flat-sheet membranes prepared by salt-dilution-induced phase inversion. During fabrication, a fraction of the cellulosic additive is leached from the polymer solution, enhancing membrane porosity and permeability, while the residual fraction reinforces mechanical stability. Crosslinking with sodium trimetaphosphate (STMP) further strengthens the membranes. Membranes using HEC as the cellulosic additive exhibit a tunable increase in pure water permeability (from

43 \pm 10

123 \pm 47

LMH

\cdot

bar⁻¹) and molecular weight cut-off (from

117 \pm 64

460 \pm 360

kDa). In addition, additive pretreatment and crosslinking strategies enable surface charge modulation, shifting it from positive to neutral or negative, and tailoring salt retention profiles. These findings establish cellulosic additives as versatile design elements in the emerging class of aqueous PEC membrane systems.

在传统的膜制造中，水溶性添加剂如聚乙烯吡咯烷酮（PVP）在产生孔隙度和调节表面性能方面起着关键作用。相比之下，通过全水过程生产的膜的可比改性剂，如聚电解质复合物（PEC）膜，在很大程度上仍未被开发。在这里，我们证明了羟乙基纤维素（HEC）和羟丙基纤维素（HPC）在盐稀释诱导相转化制备的PEC平板膜中作为有效的孔隙形成剂和结构调节剂。在制造过程中，一部分纤维素添加剂从聚合物溶液中浸出，提高了膜的孔隙度和渗透率，而剩余的部分则增强了机械稳定性。与三甲基磷酸钠（STMP）交联进一步加强了膜。使用HEC作为纤维素添加剂的膜表现出纯水渗透率（从43±10到123±47 LMH·bar−1）和分子量截止（从117±64到460±360 kDa）的可调增加。此外，添加剂预处理和交联策略可以实现表面电荷调制，将其从正电荷转变为中性或负电荷，并调整盐保留曲线。这些发现确立了纤维素添加剂作为新兴的水性PEC膜系统的通用设计元素。

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引用次数: 0

Pressure-drop reduction by oil-infused spacers 注油垫片降低压降

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-10-22 DOI: 10.1016/j.memlet.2025.100109

Arthur Boyko, Alina Lemster, Guy. Z Ramon

This study explores oil-infused polydimethylsiloxane (iPDMS) feed spacers designed to reduce pressure drop in spiral-wound membrane (SWM) modules. While crucial for structural support and fouling mitigation, conventional feed spacers increase pressure drop, leading to higher energy demands. By infusing PDMS spacers with silicone oils of varying viscosities (10, 20, and 100 cSt), we achieved significant reductions in pressure drop—up to 46% compared to non-infused spacers. Lower-viscosity oils demonstrated the most pronounced improvements. Numerical simulations corroborate the experimental data, showing that the slippery surface of the oil-infused spacers minimizes flow resistance and reduces energy dissipation. These findings suggest that incorporating oil-infused spacers can enhance SWM module efficiency, offering a promising approach to lowering operational energy costs in membrane-based water treatment systems.

本研究探讨了油注入聚二甲基硅氧烷（iPDMS）进料垫片，旨在减少螺旋缠绕膜（SWM）模块的压降。虽然对于结构支撑和减少污垢至关重要，但传统的进料垫片会增加压降，从而导致更高的能源需求。通过向PDMS隔离剂注入不同粘度（10、20和100 cSt）的硅油，与未注入隔离剂相比，压力降显著降低了46%。低粘度油表现出最明显的改善。数值模拟证实了实验数据，表明注油隔离器光滑的表面使流动阻力最小化，减少了能量耗散。这些发现表明，加入注油隔离剂可以提高SWM模块的效率，为降低膜基水处理系统的运行能源成本提供了一种有希望的方法。

引用次数: 0

Joule-heating membranes: Do they really work for membrane distillation processes? 焦耳加热膜：它们真的适用于膜蒸馏过程吗？

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-10-02 DOI: 10.1016/j.memlet.2025.100108

Arian Enayat, Mehdi Azhdarzadeh, Sadaf Noamani, Andre McDonald, Mohtada Sadrzadeh

This study critically evaluates the effectiveness of Joule-heated membranes (JHMs) in membrane distillation (MD) processes. Using a Nusselt-based mathematical model and experimental validation, we assess whether JHMs can significantly enhance mass transfer and energy efficiency in MD systems. Our results demonstrate that although JHMs do reduce temperature polarization by 2-3 times compared to conventional MD, the overall flux gains remain modest under standard configurations due to limitations in system design, such as uninsulated tanks and insufficient heat localization. The findings suggest that the limitations are not inherent to the JHMs themselves, but rather stem from suboptimal system integration. With targeted improvements in module insulation, flow configuration, and coating materials, JHMs hold promise for scalable and energy-efficient water treatment applications.

本研究批判性地评估了焦耳加热膜（JHMs）在膜蒸馏（MD）过程中的有效性。利用基于nusselet的数学模型和实验验证，我们评估了jhm是否能显著提高MD系统的传质和能量效率。我们的研究结果表明，尽管与传统的MD相比，jhm确实减少了2-3倍的温度极化，但由于系统设计的限制，如非绝缘罐和热局部化不足，在标准配置下，总体通量增益仍然不大。研究结果表明，这些限制并不是jhm本身固有的，而是源于次优的系统集成。随着模块绝缘、流动配置和涂层材料的有针对性的改进，jhm有望实现可扩展和节能的水处理应用。

引用次数: 0

Membrane separation of dispersion of PbS colloidal quantum dots with iodide ligands 碘化物配体对PbS胶体量子点分散的膜分离研究

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-09-18 DOI: 10.1016/j.memlet.2025.100107

Jun Tanaka, Seiya Ikeda, Nozomu Yoshikuni, Kohki Mukai

We have succeeded in membrane separation to classify PbS colloidal quantum dots (CQDs) with iodide ligands, which have the potential to significantly improve the performance of many optoelectronic devices such as solar cells. CQDs are expected to be applied in various fields due to their unique features; however, a method for mass-producing uniform CQDs has not yet been established, and the high manufacturing costs resulting from small-scale production are hindering social implementation. We have proposed the membrane separation process as an alternative to conventional centrifugation and demonstrated an acceleration and improved efficiency of the separation processes, thereby eliminating the bottlenecks. Size separation of CQDs with iodide ligands (I-CQDs) using membrane filtration has remained particularly challenging due to their inevitable adsorption to the membrane. In this work, I-CQDs were successfully withdrawn to the filtrate without adsorption by dispersing them in a quaternary mixed solvent that satisfies the adsorption-inhibiting conditions proposed in previous studies, which are based on Hansen solubility parameters. Our membrane separation technology will become the basis for the low-cost production of I-CQDs.

我们已经成功地通过膜分离对碘化物配体的PbS胶体量子点（CQDs）进行了分类，这有可能显著提高许多光电器件的性能，如太阳能电池。由于其独特的特性，CQDs有望在各个领域得到应用；然而，大规模生产统一CQDs的方法尚未建立，小规模生产导致的高制造成本阻碍了社会实施。我们提出了膜分离过程作为传统离心的替代方案，并证明了分离过程的加速和效率的提高，从而消除了瓶颈。由于碘化物配体（I-CQDs）不可避免地吸附在膜上，使用膜过滤分离CQDs的尺寸仍然是特别具有挑战性的。在这项工作中，通过将I-CQDs分散在满足先前研究中提出的基于Hansen溶解度参数的吸附抑制条件的季系混合溶剂中，成功地将其提取到滤液中而不被吸附。我们的膜分离技术将成为低成本生产I-CQDs的基础。

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引用次数: 0

Ongoing phase separation inside hollow fiber membranes via non-solvent induced phase separation 通过非溶剂诱导相分离在中空纤维膜内进行相分离

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-09-15 DOI: 10.1016/j.memlet.2025.100106

Khalid Mohammad Tayyab , Mohammad Aadil , Chul Ho Park

This study investigates the critical influence of residual solvent on pore evolution during the non-solvent induced phase separation (NIPS) process. Employing a comprehensive multi-technique approach, including FT-IR spectroscopy, UV absorbance, contact angle, mechanical testing, shrinkage analysis, and confocal fluorescence microscopy, membrane's morphological evolution is elucidated. The findings demonstrate that residual solvent, particularly under elevated cleaning temperatures, significantly promotes pore collapse, leading to a substantial reduction in water flux. To mitigate this issue, we develop a tailored cleaning solution (methanol, water, and calcium chloride) that effectively enhances solvent exchange while maintaining the rejection performance for bovine serum albumin (BSA). Crucially, this research reveals that residual solvent significantly affects membrane performance, influencing pore structure in ways that go beyond the traditional understanding of the initial phase separation process.

研究了非溶剂诱导相分离（NIPS）过程中残余溶剂对孔隙演化的关键影响。采用FT-IR光谱、UV吸光度、接触角、力学测试、收缩分析和共聚焦荧光显微镜等综合技术手段，对膜的形态演变进行了研究。研究结果表明，残留溶剂，特别是在较高的清洗温度下，显著促进孔隙坍塌，导致水通量大幅减少。为了缓解这个问题，我们开发了一种定制的清洁溶液（甲醇，水和氯化钙），有效地提高溶剂交换，同时保持牛血清白蛋白（BSA）的去除性能。至关重要的是，本研究揭示了残留溶剂对膜性能的显著影响，其影响孔结构的方式超出了对初始相分离过程的传统理解。

引用次数: 0

Novel carbon molecular sieve membranes for CO2 separation derived from the zero-dimension carbon quantum dots doped polyimide 用掺杂聚酰亚胺的零维碳量子点制备CO2分离用新型碳分子筛膜

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-09-08 DOI: 10.1016/j.memlet.2025.100105

Lujie Sheng, Xianglong Zhang, Qingdi Mu, Hui Li, Jizhong Ren

Carbon molecular sieve (CMS) membranes are very promising for efficient gas separation. In this work, a novel CMS membrane was constructed from the zero-dimension material doped polyimide precursor. The introduction of carbon quantum dots into the polyimide matrix precursor regulated the nanopores structure of the derived CMS membranes precisely for CO₂ separation. The PSD (pore size distribution) near 0.35 nm became narrower after the carbon quantum dots incorporation. And, the novel CMS membranes showed attracting enhancement of gas permeability (114.6 Barrer) and selectivity (94.7) for CO₂/CH₄ separation simultaneously, which broke 2008 upper bound. Furthermore, the zero-dimension materials are the promising fillers to regulate the nanopores structure of the CMS membranes.

碳分子筛（CMS）膜是一种非常有前途的高效气体分离技术。本文以零维材料掺杂聚酰亚胺为前驱体，构建了一种新型的CMS膜。将碳量子点引入聚酰亚胺基质前驱体中，可以精确调节衍生的CMS膜的纳米孔结构，用于CO2分离。碳量子点掺入后，0.35 nm附近的PSD（孔径分布）变窄。同时，新型CMS膜的透气性（Barrer为114.6）和CO2/CH4分离选择性（Barrer为94.7）均有显著提高，突破了2008年的上限。此外，零维材料是调控CMS膜纳米孔结构的有前景的填料。

引用次数: 0

Temporal fluctuations of non-equilibrium water accessible pathways in polyamide reverse osmosis active layers 聚酰胺反渗透活性层非平衡水通路的时间波动

IF 4.7 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-08-14 DOI: 10.1016/j.memlet.2025.100104

Timothy M. Weigand, Riley Vickers, Cass T. Miller, Orlando Coronell

Molecular-scale simulations of pressure-driven transport through polyamide domains were performed. Analysis revealed the importance of non-equilibrium molecular distributions and the existence of connected pathways from feed to permeate at all times. Individual pathways were found to be ephemeral with an observed upper bound persistence time of 1.75 ns.

通过聚酰胺结构域进行压力驱动输运的分子尺度模拟。分析揭示了非平衡分子分布的重要性，以及存在从进料到渗透的连接途径。个别途径是短暂的，观察到的上限持续时间为1.75 ns。

引用次数: 0

Maximizing liquid fertilizer concentration during ammoniacal nitrogen recovery using hollow fiber membrane contactors 利用中空纤维膜接触器在氨氮回收过程中最大限度地提高液肥浓度

IF 4.9 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-07-07 DOI: 10.1016/j.memlet.2025.100103

Musie Welldegerima Atsbha, Oded Nir

Hollow fiber membrane contactors (HFMC) can recover high-purity ammonium (liquid) fertilizer from wastewater with low energy and area footprint. Previous studies examined factors such as pH, initial ammonia concentration, flow rate, stream configuration, and acid-stripping solution. However, water flux through the membrane, impacting %N in acid stripping, remains a key barrier to producing commercial-grade liquid fertilizer. This study tested %N enhancement by increasing feed-side salinity to reduce vapor pressure, thereby reducing undesired water flux to the acid side. Two salinity levels (2 M and 5 M NaCl) representing zeolite regeneration solutions were tested. With 5 M NaCl, water flux was nullified, yielding 12 %N (NH₄⁺) over two cycles, considered very high for this technology. In contrast, 2 M NaCl allowed water flux, achieving only 9 %N. In a third cycle, 5 M NaCl further increased %N to ∼14 %, an unprecedented result for HFMC. Water flux was negative (-0.031 L/m²·h) with 5 M and positive (0.015 L/m²·h) with 2 M NaCl, indicating reverse or forward flow. Ammonia removal efficiency and transfer coefficient (K) remained stable. Furthermore, the membrane prevented ion cross-contamination, producing high-purity liquid fertilizer. Operating at higher salinity, as in ammonia-laden regeneration solutions, may be economically feasible due to solution reusability. This approach optimizes feed properties for highly concentrated liquid fertilizer production.

中空纤维膜接触器（HFMC）可以低能耗、低占地面积地从废水中回收高纯铵（液）肥。先前的研究考察了诸如pH值、初始氨浓度、流速、流配置和酸剥离溶液等因素。然而，通过膜的水通量，影响酸提过程中的%N，仍然是生产商业级液肥的关键障碍。本研究通过提高进料侧盐度来降低蒸汽压，从而减少不希望的水通量到酸侧，测试了%N的增强。测试了代表沸石再生溶液的两种盐度水平（2 M和5 M NaCl）。在5 M NaCl条件下，水通量为零，在两个循环中产生12%的N (NH4+)，这对于该技术来说是非常高的。相反，2 M NaCl允许水通量，只有9% N。在第三个循环中，5 M NaCl进一步将%N增加到~ 14%，这是HFMC前所未有的结果。当NaCl浓度为5 m时，水通量为负（-0.031 L/m²·h），当NaCl浓度为2 m时，水通量为正（0.015 L/m²·h），表明水流正向或反向流动。氨的去除效率和传递系数(K)保持稳定。此外，膜防止离子交叉污染，生产高纯度的液体肥料。由于溶液可重复使用，在较高盐度下操作，如在含氨再生溶液中操作，在经济上是可行的。这种方法优化了高浓缩液体肥料生产的饲料性能。

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Self-regulating behavior of hybrid membrane systems as demonstrated in an element-scale forward osmosis-reverse osmosis hybrid system 元尺度正渗透-反渗透混合膜系统的自调节行为

IF 4.9 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Letters

Pub Date : 2025-06-18 DOI: 10.1016/j.memlet.2025.100102

Noah Ferguson, Maqsud Chowdhury, Colin Fitzsimonds, Nicole Beauregard, Mayur Ostwal, Marianne Pemberton, Edward Wazer, Caylin Cyr, Ranjan Srivastava, Jeffrey R. McCutcheon

Hybrid membrane systems can be difficult to design due to the requisite flow rate matching between up- and downstream unit operations. In this work, we use a forward osmosis-reverse osmosis (FO-RO) hybrid system to demonstrate how some membrane systems can exhibit self-regulating behavior due to osmotic coupling. This can reduce the need for complex control systems for flow balancing. We show this behavior using a module-scale test bed that can mimic the behavior of larger scale operations. The system shows permeate flow rate near-convergence between the FO and RO modules after startup or when perturbed by a change in RO module pressure. The behavior of this hybrid system demonstrates that some membrane operations can exploit osmotic interdependence, rather than expensive control systems, to achieve steady state operation.

由于上下游装置操作之间需要流量匹配，混合膜系统可能很难设计。在这项工作中，我们使用正向渗透-反渗透（FO-RO）混合系统来演示一些膜系统如何由于渗透耦合而表现出自我调节行为。这可以减少对流量平衡的复杂控制系统的需求。我们使用一个模块规模的测试平台来展示这种行为，该平台可以模拟更大规模操作的行为。系统显示，在启动后或受到RO模块压力变化的干扰时，FO和RO模块之间的渗透流量接近收敛。这种混合系统的行为表明，一些膜操作可以利用渗透相互依赖，而不是昂贵的控制系统，以实现稳态操作。

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