Journal of Membrane Science Letters最新文献

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

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

{"title":"Membrane separation of dispersion of PbS colloidal quantum dots with iodide ligands","authors":"Jun Tanaka, Seiya Ikeda, Nozomu Yoshikuni, Kohki Mukai","doi":"10.1016/j.memlet.2025.100107","DOIUrl":"10.1016/j.memlet.2025.100107","url":null,"abstract":"<div><div>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 In this work, I-CQDs were successfully withdrawn to the filtrate without adsorption by dispersing them in a quaternary mixed solvent that satisfies the adsorption-inhibiting conditions proposed in previous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.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 2","pages":"Article 100107"},"PeriodicalIF":4.7,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

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

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

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

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

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

Journal of Membrane Science Letters Pub Date : 2025-07-07 DOI: 10.1016/j.memlet.2025.100103

Musie Welldegerima Atsbha, Oded Nir

{"title":"Maximizing liquid fertilizer concentration during ammoniacal nitrogen recovery using hollow fiber membrane contactors","authors":"Musie Welldegerima Atsbha, Oded Nir","doi":"10.1016/j.memlet.2025.100103","DOIUrl":"10.1016/j.memlet.2025.100103","url":null,"abstract":"<div><div>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 (NH<sub>4</sub><sup>+</sup>) 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 (<em>K</em>) 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.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 2","pages":"Article 100103"},"PeriodicalIF":4.9,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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

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

引用次数: 0

Reactive substrate-driven interfacial polymerization for wrinkled polyamide membranes with enhanced permeance 活性底物驱动的界面聚合在具有增强渗透性的起皱聚酰胺膜上

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-05-24 DOI: 10.1016/j.memlet.2025.100101

Ping Xu , Shaofan Duan , Pengfei Zhang , Kecheng Guan , Hideto Matsuyama

{"title":"Reactive substrate-driven interfacial polymerization for wrinkled polyamide membranes with enhanced permeance","authors":"Ping Xu , Shaofan Duan , Pengfei Zhang , Kecheng Guan , Hideto Matsuyama","doi":"10.1016/j.memlet.2025.100101","DOIUrl":"10.1016/j.memlet.2025.100101","url":null,"abstract":"<div><div>A novel strategy was developed to regulate polyamide (PA) membrane morphology and performance by introducing a reactive copolymer, poly(styrene-alt-maleic anhydride) (PSMA), into the polyethersulfone (PES) substrate. The reactive anhydride groups of PSMA first react with piperazine (PIP) monomers, subsequently affecting diffusion and reaction dynamics of the remaining monomers during interfacial polymerization (IP) for PA layer formation. As a result, wrinkled PA morphologies were formed, enhancing the surface roughness and effective filtration area. The wrinkled PA membranes exhibited significantly improved water permeance (up to 19.7 L m<sup>-2</sup> h<sup>-1</sup> bar<sup>-1</sup>) while maintaining comparable rejection rates of 98.7 %, 98.2 %, 85.7 %, 6.1 %, 7.1 % for Na<sub>2</sub>SO<sub>4</sub>, MgSO<sub>4</sub>, MgCl<sub>2</sub>, LiCl, and NaCl, respectively, due to the similar free volume to unmodified membranes. This work offers a promising approach to tailor membrane structure and optimize nanofiltration performance via substrate reactivity engineering.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100101"},"PeriodicalIF":4.9,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sealing grain boundary defects in polycrystalline ZIF-8 membranes by graphene oxide coating 氧化石墨烯涂层密封多晶ZIF-8膜的晶界缺陷

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-05-14 DOI: 10.1016/j.memlet.2025.100100

Ga Eun Kim , Gyu-Jin Lee , Seoung-Eun Nam , Jinsoo Kim , Sung In Lim , Hyuk Taek Kwon

引用次数: 0

Partition energy in polyamide membranes and its link to ion-ion selectivity 聚酰胺膜的分配能及其与离子选择性的关系

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-05-02 DOI: 10.1016/j.memlet.2025.100099

Liat Birnhack , Oren Ben Porat , Ori Fridman , Tiezheng Tong , Razi Epsztein

{"title":"Partition energy in polyamide membranes and its link to ion-ion selectivity","authors":"Liat Birnhack , Oren Ben Porat , Ori Fridman , Tiezheng Tong , Razi Epsztein","doi":"10.1016/j.memlet.2025.100099","DOIUrl":"10.1016/j.memlet.2025.100099","url":null,"abstract":"<div><div>Understanding the mechanisms of molecular transport in polyamide membranes is imperative to improve their solute-specific selectivity. We explored the partitioning behaviors of water and salts in polyamide membranes to elucidate the role of ion-membrane interactions in the transport. Quartz crystal microbalance (QCM) was employed to quantify the mass uptake at different temperatures and determine partition energies (<em>E</em><sub>k</sub>) for water and salts under two different pH values. Zeta potential and permeability tests were conducted to support the ion-membrane affinity trends observed with QCM and link these trends to ion-ion selectivity. Our results demonstrate a high affinity of water to the polyamide membrane (<em>E</em><sub>k</sub> < 0), with a significant swelling effect attributed to dipole interactions and hydrogen bonding. Ion partitioning revealed distinct differences between monovalent and divalent cations, as well as between kosmotropic and chaotropic anions. Specifically, divalent cations (Ca<sup>2+</sup> and Mg<sup>2+</sup>) exhibited considerably lower partition energies (-0.99 and 0.29 kcal mol<sup>-1</sup>, respectively) and more efficient charge neutralization, indicating stronger interactions with the membrane compared to monovalent cations (∼2.2 kcal mol<sup>-1</sup>). The partition energies of the chaotropic iodide and kosmotropic sulphate anions were substantially different (-5.5 and 4.0 kcal mol<sup>-1</sup>, respectively), likely due to the different tendency of these anions to shed their hydration shell and stick to the polymer. Last, our permeability tests indicate the potential existence of an intrinsic tradeoff between ion partitioning and intrapore diffusion, presumably due to the opposite effects that ion-membrane interactions have on these transport steps. Overall, our work underscores the role of ion-specific interactions in membrane transport and selectivity.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100099"},"PeriodicalIF":4.9,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rinse-free deposition of molecular layer-by-layer (mLbL) polyamide reverse osmosis membranes 分子层逐层（mLbL）聚酰胺反渗透膜的免冲洗沉积

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-04-29 DOI: 10.1016/j.memlet.2025.100098

Samarpan Deb Majumder , Christopher M. Stafford , Xitong Liu

{"title":"Rinse-free deposition of molecular layer-by-layer (mLbL) polyamide reverse osmosis membranes","authors":"Samarpan Deb Majumder , Christopher M. Stafford , Xitong Liu","doi":"10.1016/j.memlet.2025.100098","DOIUrl":"10.1016/j.memlet.2025.100098","url":null,"abstract":"<div><div>The molecular layer-by-layer (mLbL) deposition technique enables the fabrication of polyamide-based reverse osmosis membranes with low surface roughness and tunable membrane thickness, but scale-up of the process is challenged by the necessity for rinsing away unreacted monomers after each deposition step. By sensible tuning of monomer concentrations during deposition, we can eliminate the rinsing steps while still producing polyamide membranes with comparable thickness and surface properties. This approach markedly shortens fabrication time and improves reagent efficiency. By measuring the growth rate of the polyamide membrane as a function of deposition cycles and monomer concentration, we demonstrate that we can deliver a more targeted quantity of monomer to the growing film surface while maintaining a linear growth rate profile. Desalination tests reveal that mLbL membranes produced at the lowest monomer concentration (membrane thickness of ≈20 nm) achieved 99.9 % salt rejection within 4 h, while maintaining a flux of 0.98 L m⁻² h⁻¹ bar⁻¹, indicating that the crosslink density of the membrane remains high. This modified mLbL approach significantly reduces membrane fabrication time without compromising performance, offering a path towards scalable production of polyamide-based membranes with controlled thickness and low roughness while prioritizing both time and resource efficiency.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100098"},"PeriodicalIF":4.9,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0