Journal of Membrane Science Letters最新文献_第8页

Production of sub-10 micrometre cellulose microbeads using isoporous membranes 使用等孔膜生产10微米以下的纤维素微珠

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100024

Ekanem E. Ekanem , Ainur Sabirova , Ciarán Callaghan , Janet L. Scott , Karen J. Edler , Suzana P. Nunes , Davide Mattia

{"title":"Production of sub-10 micrometre cellulose microbeads using isoporous membranes","authors":"Ekanem E. Ekanem , Ainur Sabirova , Ciarán Callaghan , Janet L. Scott , Karen J. Edler , Suzana P. Nunes , Davide Mattia","doi":"10.1016/j.memlet.2022.100024","DOIUrl":"https://doi.org/10.1016/j.memlet.2022.100024","url":null,"abstract":"<div><p>The production of sub-10 µm cellulose microbeads via membrane emulsification using isoporous membranes is reported here for the first time. Poly(ethylene terephthalate) membranes, with defined interpore distances, pore diameters and straight-through pores were fabricated via photolithography. A dispersed phase of 8 wt% cellulose solution was extruded through the membrane pores, forming, due to shear provided by an overhead stirrer, cellulose solution droplets dispersed in a continuous phase composed of 2 wt% and 5 wt% Span in sunflower oil. Upon phase inversion with ethanol, sub-10 µm microbeads with a coefficient of variation (CV) < 45 % were produced by exploring the Weber number (<em>We<sub>d</sub></em>) - Capillary number (<em>Ca<sub>c</sub></em>) emulsion generation space.</p><p>These results show that sub-10 µm cellulose microbeads can be produced using isoporous polymer membranes fabricated via photolithography, for use in a wide range of applications in the personal care, food and drug industries.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100024"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000125/pdfft?md5=a836311ad3b698ebd8427c4ebe27a759&pid=1-s2.0-S2772421222000125-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137290593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a new blocking model for membrane fouling based on a composite media model 基于复合介质模型的膜污染阻塞模型的建立

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100018

Andrew L. Zydney

{"title":"Development of a new blocking model for membrane fouling based on a composite media model","authors":"Andrew L. Zydney","doi":"10.1016/j.memlet.2022.100018","DOIUrl":"10.1016/j.memlet.2022.100018","url":null,"abstract":"<div><p>The pore constriction (or standard blocking) model is widely used to describe the filtration behavior for a wide range of suspensions/solutions even though the underlying assumption of a uniform reduction in the radius of non-interconnected cylindrical pores is unlikely to be valid in almost any system. This short communication presents an alternative blocking model based on a description of the effective permeability of a fouled membrane accounting for the flow around and under the deposited foulant through the interconnected pore structure of the membrane. The resulting filtration equation gives linear fouling relationships that are very similar to those for the classical pore constriction model, including the slope on a derivative plot, providing a possible justification for the successful use of the pore constriction formalism in describing the flux decline behavior in many membrane systems. In addition, this new blocking model is readily extended to the case where the deposited foulant is permeable to flow. This new composite media blocking model not only provides useful expressions for the rate of flux decline during constant pressure filtration, it also provides insights into the underlying physical mechanisms controlling fouling in membrane systems.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100018"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277242122200006X/pdfft?md5=188498cf425e22cb1a32cb11b7bedc18&pid=1-s2.0-S277242122200006X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74446120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Overlooked glassy polymer attributes illustrated by asymmetric polyimide hollow fibers 不对称聚酰亚胺中空纤维显示了被忽视的玻璃聚合物属性

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2021.100011

Maryam Irani, Nicholas León, Zhongyun Liu, William J. Koros

引用次数: 1

Linking endogenous decay and sludge bulking in the microbial community to membrane fouling at sub-critical flux 亚临界通量下膜污染与微生物群落内源性腐烂和污泥膨胀的关系

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100023

Anh Q. Nguyen, Luong N. Nguyen, Md Abu Hasan Johir, Huu Hao Ngo, Long D. Nghiem

{"title":"Linking endogenous decay and sludge bulking in the microbial community to membrane fouling at sub-critical flux","authors":"Anh Q. Nguyen, Luong N. Nguyen, Md Abu Hasan Johir, Huu Hao Ngo, Long D. Nghiem","doi":"10.1016/j.memlet.2022.100023","DOIUrl":"10.1016/j.memlet.2022.100023","url":null,"abstract":"<div><p>This study examined membrane fouling and associated microbial taxa in a membrane bioreactor operating at a sub-critical flux condition using next-generation amplicon sequencing. The membrane was operated at a sub-critical flux, thus, fouling was not observed until endogenous decay. The observed fouling could be attributed to endogenous decay which was driven by nutrient deficiency at high sludge age and low food-to-microorganisms ratio (decreasing from 0.15 to 0.09 gBOD/gMLVSS.d). Endogenous decay resulted in a sharp decrease of the number of species and evenness between different species (49.7 and 58.9% compared to the inoculum, respectively). The release of dissolved organic matters and cell debris from endogenous decay as well as the excessive growth of filamentous bacteria, e.g. <em>Thiotrichales</em> were the main contributors to membrane fouling. The relative abundance of <em>Thiotrichales</em> significantly correlated with TMP (Pearson R = 0.996, <em>p</em>-value <0.001), indicating this order's contribution to membrane fouling. Other dominant orders in the mixed liquor after endogenous decay such as <em>Rhizobiales, Burkholderiales, Rhodospirillales</em> and <em>Myxococcales, Flavobacteriales</em> can produce extracellular polymeric substances and aggravating membrane fouling. Fouling layers possess highly similar microbial composition with the mixed liquor, with some filamentous microbial orders, e.g. <em>Corynebacteriales</em> and <em>Oligoflexales</em> showing increased relative abundance by 6.83 and 5.64 folds, respectively.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100023"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000113/pdfft?md5=b8a964da11461eef8665ce601239f1e5&pid=1-s2.0-S2772421222000113-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87428180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Microwave-induced ultrafast crosslinking of Poly (vinyl alcohol) blended with nanoparticles as wave absorber for pervaporation desalination 微波诱导超快交联聚乙烯醇与纳米粒子混合作为渗透蒸发脱盐的吸波剂

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100021

Yunfei Xing, Yunlong Xue, Dujian Qin, Pengbo Zhao, Pei Li

引用次数: 6

Beyond separation: Membranes towards medicine 超越分离:迈向医学

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100020

Ying Xie, Zhenyu Chu, Wanqin Jin

引用次数: 2

A prebiotic chemistry inspired one-step functionalization of zwitterionic nanofiltration membranes for efficient molecular separation 一个益生元化学启发一步功能化的两性离子纳滤膜的有效分子分离

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100013

Pengtao Gao , Pengrui Jin , Ruben Dumas , Jianjun Huang , Anika Benozir Asha , Ravin Narain , Bart Van der Bruggen , Xing Yang

{"title":"A prebiotic chemistry inspired one-step functionalization of zwitterionic nanofiltration membranes for efficient molecular separation","authors":"Pengtao Gao , Pengrui Jin , Ruben Dumas , Jianjun Huang , Anika Benozir Asha , Ravin Narain , Bart Van der Bruggen , Xing Yang","doi":"10.1016/j.memlet.2022.100013","DOIUrl":"10.1016/j.memlet.2022.100013","url":null,"abstract":"<div><p>Loose nanofiltration (LNF) membranes have shown promises in achieving efficient separation on molecular level at relatively low pressure. In this study, a zwitterionic PES/AMN/PSBAE LNF membrane was designed by co-depositing the AMN and an in-house made zwitterionic copolymer of poly(sulfobetaine methacrylate-co-2-aminoethyl methacrylate hydrochloride) (PSBAE), in which a bio-inspired molecule aminomalononitrile (AMN) with prebiotic chemistry was used to replace the commonly applied polydopamine for rapid membrane coating, significantly reducing the surface modification time from more than 20 h to less than 1 h. The AMN-based LNF, namely PES/AMN/PSBAE membrane, was demonstrated in the separation of dye/salt from synthetic textile wastewater, exhibiting superior performance with a high water permeance of 62.9 LMH bar<sup>−1</sup> and nearly complete dye/salt fractionation, i.e., simultaneously a high rejection of all dyes tested up to 99.9% and almost complete transport of salts. Combining with material and membrane characterization, the separation performance of the membrane was evaluated, demonstrating the advantages of the prebiotic chemistry coating and zwitterionic functionality. This study provides a new and facile strategy based on the AMN chemistry for LNF membrane surface functionalization to achieve efficient molecular separation.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100013"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000010/pdfft?md5=fd837322312ade16d7bd76e027f3fde0&pid=1-s2.0-S2772421222000010-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91019662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Interpreting contact angles of surfactant solutions on microporous hydrophobic membranes 表面活性剂溶液在微孔疏水膜上的接触角解释

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100015

Yu-Xi Huang , Zhangxin Wang , Thomas Horseman , Joshua L. Livingston , Shihong Lin

{"title":"Interpreting contact angles of surfactant solutions on microporous hydrophobic membranes","authors":"Yu-Xi Huang , Zhangxin Wang , Thomas Horseman , Joshua L. Livingston , Shihong Lin","doi":"10.1016/j.memlet.2022.100015","DOIUrl":"10.1016/j.memlet.2022.100015","url":null,"abstract":"<div><p>Almost every single experimental study regarding membranes involves the measurement of contact angle (CA) to quantify the membrane wetting property. However, the interpretation of CA can sometimes be tricky. In this study, we investigate an interesting phenomenon about the CA of a surfactant solution on a microporous hydrophobic membrane. Specifically, a surfactant solution with a very low surface tension can have an unexpectedly high CA on a microporous hydrophobic membrane. In contrast, a water/ethanol mixture with the same surface tension completely wicks the membrane (i.e., zero CA). The drastic difference in CA between the two types of liquid of the same surface tension results from the rapid adsorption of surfactants at the wetting frontier which substantially reduces the local surfactant concentration and increases the local surface tension. The same theory can also be applied to explain the striking difference between the two liquids in capillary rise and liquid entry pressure. The results from this study cast significant doubt on the role of surface tension in understanding the wetting behavior of surfactant solutions when they are in contact with solid with large specific area and raise important questions regarding the utility of measuring CA for surfactant solutions on microporous hydrophobic membranes.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100015"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000034/pdfft?md5=82ce1a58bec6e4d0c51c5d77699434a1&pid=1-s2.0-S2772421222000034-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81415604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Induced polymer crystallinity in mixed matrix membranes by metal-organic framework nanosheets for gas separation 金属-有机骨架纳米片气体分离在混合基质膜中诱导聚合物结晶度

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100017

Dechao Wang , Yunpan Ying , Yaping Zheng , Yunchuan Pu , Ziqi Yang , Dan Zhao

引用次数: 5

Characterizing surface porosity of porous membranes via contact angle measurements 通过接触角测量表征多孔膜的表面孔隙度

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100022

Minhao Xiao , Fan Yang , Sungju Im , Derrick S. Dlamini , David Jassby , Shaily Mahendra , Ryo Honda , Eric M.V. Hoek

{"title":"Characterizing surface porosity of porous membranes via contact angle measurements","authors":"Minhao Xiao , Fan Yang , Sungju Im , Derrick S. Dlamini , David Jassby , Shaily Mahendra , Ryo Honda , Eric M.V. Hoek","doi":"10.1016/j.memlet.2022.100022","DOIUrl":"10.1016/j.memlet.2022.100022","url":null,"abstract":"<div><p>This investigation attempts to establish and verify a novel method for quantifying surface porosity of porous polymeric membranes via contact angle measurements. Herein, we fabricate a series of porous membranes via nonsolvent induced phase separation (NIPS) comprising different concentrations of polyvinylidene fluoride (PVDF) and PVDF-poly (methyl methacrylate) block co-polymer (PVDF-PMMA) with different concentrations of water and isopropyl alcohol (IPA) in the coagulation bath. Both sessile drop and captive bubble contact angle measurements are used to determine contact angles (and porosity) for both dry and wet membranes, respectively. The former method is probably applicable for membrane distillation, aeration and de-aeration where liquid water does not saturate the membrane, whereas the latter may be more indicative of pressure-driven aqueous membrane separations where the membrane is saturated through its cross-section. Image analysis of scanning electron microscope (SEM) images quantified dry membrane surface porosity. We propose a simple analytical model to obtain wet and dry membrane surface porosity from contact angle measurements. Our results suggest that the surface porosity calculated from both wet and dry contact angle data correlates strongly with the surface porosity calculated from SEM values. However, wet contact angles of the membranes with high porosities produce significantly higher porosity values, which also establishes the importance of porous membrane swelling in determining membrane porosity for aqueous membrane separations.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100022"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000101/pdfft?md5=818cf854218af4133595bf0f3b3a3611&pid=1-s2.0-S2772421222000101-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78796765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13