首页 > 最新文献

Journal of Membrane Science Letters最新文献

英文 中文
Improving intermediate-temperature stability of BSCF by constructing high entropy perovskites 构建高熵钙钛矿提高BSCF中温稳定性
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100026
Jingyi Wang , Zhongwei Cao , Xuefeng Zhu , Weishen Yang

High entropy perovskites bring more space for materials design in many fields. The stability of materials in thermodynamics can be improved by increasing the mixed entropy. In this work, a series of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) based high entropy perovskite (HEBSCF) were designed to improve the stability of BSCF at intermediate temperatures. The influence of high entropy composition on the lattice parameter, microstructure and stability of HEBSCF were investigated. The results show that HEBSCF can accommodate cations with large size differences. Compared with BSCF, doping elements at A site (HEBSCF-A), B site (HEBSCF-B) or both sites (HEBSCF-AB) can improve the mixed entropy. Among the three doped BSCF, HEBSCF-AB has the highest mixed entropy and shows stable oxygen permeation flux at 750 and 800 °C up to 300 h. No phase transition was observed on HEBSCF-AB after the long-term tests at intermediate temperatures. This research indicates that the high entropy stabilization strategy is feasible to improve the permeation stability of perovskite membranes by inhibiting phase transition.

高熵钙钛矿为许多领域的材料设计带来了更大的空间。增加混合熵可以提高材料的热力学稳定性。本文设计了一系列ba0.5 sr0.5 co0.8 fe0.3 2o3 -δ (BSCF)基高熵钙钛矿(HEBSCF),以提高BSCF在中温下的稳定性。研究了高熵组成对HEBSCF晶格参数、微观结构和稳定性的影响。结果表明,HEBSCF可以容纳较大尺寸差异的阳离子。与BSCF相比,在A位点(HEBSCF-A)、B位点(HEBSCF-B)或两个位点(HEBSCF-AB)掺杂元素都能提高混合熵。在三种掺杂的BSCF中,HEBSCF-AB的混合熵最高,在750和800℃至300 h时表现出稳定的氧渗透通量。在中温长期测试后,HEBSCF-AB未观察到相变。该研究表明,高熵稳定策略通过抑制钙钛矿膜的相变来提高钙钛矿膜的渗透稳定性是可行的。
{"title":"Improving intermediate-temperature stability of BSCF by constructing high entropy perovskites","authors":"Jingyi Wang ,&nbsp;Zhongwei Cao ,&nbsp;Xuefeng Zhu ,&nbsp;Weishen Yang","doi":"10.1016/j.memlet.2022.100026","DOIUrl":"https://doi.org/10.1016/j.memlet.2022.100026","url":null,"abstract":"<div><p>High entropy perovskites bring more space for materials design in many fields. The stability of materials in thermodynamics can be improved by increasing the mixed entropy. In this work, a series of Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub> (BSCF) based high entropy perovskite (HEBSCF) were designed to improve the stability of BSCF at intermediate temperatures. The influence of high entropy composition on the lattice parameter, microstructure and stability of HEBSCF were investigated. The results show that HEBSCF can accommodate cations with large size differences. Compared with BSCF, doping elements at A site (HEBSCF-A), B site (HEBSCF-B) or both sites (HEBSCF-AB) can improve the mixed entropy. Among the three doped BSCF, HEBSCF-AB has the highest mixed entropy and shows stable oxygen permeation flux at 750 and 800 °C up to 300 h. No phase transition was observed on HEBSCF-AB after the long-term tests at intermediate temperatures. This research indicates that the high entropy stabilization strategy is feasible to improve the permeation stability of perovskite membranes by inhibiting phase transition.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 2","pages":"Article 100026"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000149/pdfft?md5=7acb9960cbea68003cedb1525ac7bca3&pid=1-s2.0-S2772421222000149-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137007658","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
Using the dimethyl sulfoxide green solvent for the making of antifouling PEGylated membranes by the vapor-induced phase separation process 采用二甲基亚砜绿色溶剂气相分离法制备防污聚乙二醇化膜
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100025
Antoine Venault, Hana Nur Aini, Tesfaye Abebe Galeta, Yung Chang

The toxicity of common solvents used in membrane fabrication threatens the environmental sustainability and questions the claim that membrane technology is a green separation technology. Therefore, there is a need for re-orienting membrane fabrication processes towards greener solutions, making use of less toxic, and possibly environmentally friendly solvents. We employed dimethyl sulfoxide (DMSO), a non-toxic solvent, to prepare casting solutions containing polyvinylidene fluoride and an antifouling random copolymer made of polystyrene and poly(ethylene glycol) methyl ether methacrylate (PS-r-PEGMA). Membranes were formed by vapor-induced phase separation (VIPS). They were shown to be homogeneous in terms of structure and surface chemistry (tested by mapping FT-IR), suggesting compatibility of the polymer/copolymer/solvent system and justifying the choice of DMSO. Membrane hydration was drastically improved after adding PS-r-PEGMA with a water contact angle falling from 140° to 47°. As a result, biofouling by Escherichia coli and whole blood was reduced by > 90% in static conditions. During several filtration cycles of a highly fouling Escherichia coli solution flux recovery ratio could be increased from 16% (pristine membrane) to 29% (PEGylated membrane). All in all, this study reveals that low-biofouling homogeneous porous membranes can be prepared by in-situ modification and the VIPS process using a greener approach than traditionally reported.

膜制造中使用的常见溶剂的毒性威胁到环境的可持续性,并质疑膜技术是一种绿色分离技术的说法。因此,有必要将膜制造工艺重新定位为更环保的解决方案,使用毒性更小、可能更环保的溶剂。我们采用无毒溶剂二甲基亚砜(DMSO)制备了含有聚偏氟乙烯和由聚苯乙烯和聚乙二醇甲基丙烯酸甲醚(PS-r-PEGMA)制成的防污无规共聚物的铸造溶液。采用气相分离(VIPS)法制备膜。它们在结构和表面化学方面都是均匀的(通过映射FT-IR测试),表明聚合物/共聚物/溶剂体系的相容性,并证明DMSO的选择是合理的。加入PS-r-PEGMA后,膜水化效果明显改善,水接触角从140°下降到47°。结果,大肠杆菌和全血的生物污染减少了>90%在静态条件下。在高污染的大肠杆菌溶液的几个过滤循环中,通量回收率可以从16%(原始膜)增加到29%(聚乙二醇化膜)。总而言之,这项研究表明,低生物污染的均匀多孔膜可以通过原位改性和VIPS工艺制备,使用比传统报道更环保的方法。
{"title":"Using the dimethyl sulfoxide green solvent for the making of antifouling PEGylated membranes by the vapor-induced phase separation process","authors":"Antoine Venault,&nbsp;Hana Nur Aini,&nbsp;Tesfaye Abebe Galeta,&nbsp;Yung Chang","doi":"10.1016/j.memlet.2022.100025","DOIUrl":"10.1016/j.memlet.2022.100025","url":null,"abstract":"<div><p>The toxicity of common solvents used in membrane fabrication threatens the environmental sustainability and questions the claim that membrane technology is a green separation technology. Therefore, there is a need for re-orienting membrane fabrication processes towards greener solutions, making use of less toxic, and possibly environmentally friendly solvents. We employed dimethyl sulfoxide (DMSO), a non-toxic solvent, to prepare casting solutions containing polyvinylidene fluoride and an antifouling random copolymer made of polystyrene and poly(ethylene glycol) methyl ether methacrylate (PS-<em>r</em>-PEGMA). Membranes were formed by vapor-induced phase separation (VIPS). They were shown to be homogeneous in terms of structure and surface chemistry (tested by mapping FT-IR), suggesting compatibility of the polymer/copolymer/solvent system and justifying the choice of DMSO. Membrane hydration was drastically improved after adding PS-<em>r</em>-PEGMA with a water contact angle falling from 140° to 47°. As a result, biofouling by <em>Escherichia coli</em> and whole blood was reduced by &gt; 90% in static conditions. During several filtration cycles of a highly fouling <em>Escherichia coli</em> solution flux recovery ratio could be increased from 16% (pristine membrane) to 29% (PEGylated membrane). All in all, this study reveals that low-biofouling homogeneous porous membranes can be prepared by <em>in-situ</em> modification and the VIPS process using a greener approach than traditionally reported.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 2","pages":"Article 100025"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000137/pdfft?md5=bad8639713799bd1e338b06d56f91381&pid=1-s2.0-S2772421222000137-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73332720","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
Carbonic anhydrase membranes for carbon capture and storage 碳酸酐酶膜用于碳捕获和储存
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100031
Yiming Zhang , Junyong Zhu , Jingwei Hou , Shouliang Yi , Bart Van der Bruggen , Yatao Zhang

Carbonic anhydrase (CA) based membranes with unique biological activities have been widely explored for carbon capture and storage (CCS), owing to their high efficiency, easy operation, low energy requirement, and environmental sustainability. However, limitations of CA enzymes, such as low thermal stabilities, narrow optimum pH ranges, and difficulties in recovery from reaction media, hinder its practical applications. Consequently, combining its enzymatic activity with membrane technologies for industrial uses is an attractive strategy. This current review explores a variety of immobilization approaches and summarizes the mechanistic features of enzymatic membranes in CO2 capture. Immobilized enzymes can be recycled to reduce process costs and improve the CO2 permeability and selectivity of the membranes. This makes enzymatic membranes attractive for CCS. The study also summarizes the structure, synthesis, and applications of a variety of CA analogues to demonstrate their advantages compared with natural CA. CA analogues hold promise for industrial and biomimetic applications.

碳酸酐酶(carbon anhydrase, CA)膜由于其高效、易操作、低能耗和环境可持续性等特点,在碳捕集与封存(CCS)领域得到了广泛的应用。然而,CA酶的局限性,如低热稳定性,较窄的最佳pH范围,以及从反应介质中回收困难,阻碍了它的实际应用。因此,将其酶活性与膜技术结合起来用于工业用途是一个有吸引力的策略。本文综述了多种固定化方法,并总结了酶膜在CO2捕获中的机理特点。固定化酶可以循环利用,降低工艺成本,提高膜的CO2渗透性和选择性。这使得酶膜对CCS很有吸引力。本研究还总结了各种CA类似物的结构、合成和应用,以证明它们与天然CA相比具有优势。CA类似物具有工业和仿生应用的前景。
{"title":"Carbonic anhydrase membranes for carbon capture and storage","authors":"Yiming Zhang ,&nbsp;Junyong Zhu ,&nbsp;Jingwei Hou ,&nbsp;Shouliang Yi ,&nbsp;Bart Van der Bruggen ,&nbsp;Yatao Zhang","doi":"10.1016/j.memlet.2022.100031","DOIUrl":"10.1016/j.memlet.2022.100031","url":null,"abstract":"<div><p>Carbonic anhydrase (CA) based membranes with unique biological activities have been widely explored for carbon capture and storage (CCS), owing to their high efficiency, easy operation, low energy requirement, and environmental sustainability. However, limitations of CA enzymes, such as low thermal stabilities, narrow optimum pH ranges, and difficulties in recovery from reaction media, hinder its practical applications. Consequently, combining its enzymatic activity with membrane technologies for industrial uses is an attractive strategy. This current review explores a variety of immobilization approaches and summarizes the mechanistic features of enzymatic membranes in CO<sub>2</sub> capture. Immobilized enzymes can be recycled to reduce process costs and improve the CO<sub>2</sub> permeability and selectivity of the membranes. This makes enzymatic membranes attractive for CCS. The study also summarizes the structure, synthesis, and applications of a variety of CA analogues to demonstrate their advantages compared with natural CA. CA analogues hold promise for industrial and biomimetic applications.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 2","pages":"Article 100031"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000186/pdfft?md5=6fc827623716fb068c9ecfb1374dc5ef&pid=1-s2.0-S2772421222000186-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88726509","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: 4
Porous substrate affects fouling propensity of thin-film composite nanofiltration membranes 多孔基板影响薄膜复合纳滤膜的污染倾向
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100036
Chenyue Wu, Li Long, Zhe Yang, Chuyang Y. Tang

Fouling is a critical consideration for the design of thin-film composite (TFC) nanofiltration membranes. Traditional wisdom believes that fouling propensity is primarily dictated by membrane surface properties while porous substrates play little role (on the basis on the latter have no effect on the foulant-membrane interaction). Nevertheless, porous substrates can regulate the water transport pathways, resulting in uneven water flux distribution over the membrane surface. For the first time, we experimentally investigated the micro-scale water flux distribution for nanofiltration membranes with different substrate porosities and the impact of such flux distribution pattern on fouling. With gold nanoparticles as tracers, we demonstrated more evenly distributed water flux at increasing substrate porosity. This was found to effectively alleviate membrane fouling by eliminating localized hot spots of high flux. Furthermore, higher substrate porosity also effectively enhanced the membrane water permeance due to the optimized water transport pathways. Our study reveals the fundamental relationship between the micro-scale transport behavior and the membrane fouling propensity, which provides a firm basis for the rational design of TFC membranes toward better separation performance.

污染是薄膜复合(TFC)纳滤膜设计的关键问题。传统观点认为,污染倾向主要由膜表面性质决定,而多孔基质的作用很小(基于后者对污膜相互作用没有影响)。然而,多孔基质可以调节水的输送途径,导致膜表面的水通量分布不均匀。本文首次通过实验研究了不同基质孔隙率的纳滤膜的微尺度水通量分布及其对污染的影响。用金纳米颗粒作为示踪剂,我们发现随着基质孔隙率的增加,水通量分布更加均匀。通过消除局部高通量热点,可以有效地缓解膜污染。此外,由于优化的输水途径,更高的基质孔隙率也有效地增强了膜的透水性。本研究揭示了膜污染倾向与微尺度迁移行为之间的基本关系,为合理设计TFC膜以获得更好的分离性能提供了坚实的依据。
{"title":"Porous substrate affects fouling propensity of thin-film composite nanofiltration membranes","authors":"Chenyue Wu,&nbsp;Li Long,&nbsp;Zhe Yang,&nbsp;Chuyang Y. Tang","doi":"10.1016/j.memlet.2022.100036","DOIUrl":"10.1016/j.memlet.2022.100036","url":null,"abstract":"<div><p>Fouling is a critical consideration for the design of thin-film composite (TFC) nanofiltration membranes. Traditional wisdom believes that fouling propensity is primarily dictated by membrane surface properties while porous substrates play little role (on the basis on the latter have no effect on the foulant-membrane interaction). Nevertheless, porous substrates can regulate the water transport pathways, resulting in uneven water flux distribution over the membrane surface. For the first time, we experimentally investigated the micro-scale water flux distribution for nanofiltration membranes with different substrate porosities and the impact of such flux distribution pattern on fouling. With gold nanoparticles as tracers, we demonstrated more evenly distributed water flux at increasing substrate porosity. This was found to effectively alleviate membrane fouling by eliminating localized hot spots of high flux. Furthermore, higher substrate porosity also effectively enhanced the membrane water permeance due to the optimized water transport pathways. Our study reveals the fundamental relationship between the micro-scale transport behavior and the membrane fouling propensity, which provides a firm basis for the rational design of TFC membranes toward better separation performance.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 2","pages":"Article 100036"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277242122200023X/pdfft?md5=a57c70b8568a4633a9d5756b1a50855d&pid=1-s2.0-S277242122200023X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85498773","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
Mitigated carrier saturation of facilitated transport membranes for decarbonizing dilute CO2 sources: An experimental and techno-economic study 减轻载体饱和的便利运输膜脱碳稀释二氧化碳源:一个实验和技术经济研究
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100014
Yang Han , W.S. Winston Ho

The CO2/N2 separation performances of facilitated transport membranes (FTMs) containing aminoacid salts as mobile carriers were characterized under dilute feed gases with 0.05–20% CO2. At a reduced CO2 partial pressure, the carrier saturation in the FTMs was mitigated, which enhanced both the CO2 permeance and CO2/N2 selectivity. The best FTM containing 2-(1-piperazinyl)ethylamine sarcosinate exhibited an uprising CO2 permeance from 1968 to 3822 GPU and an improved CO2/N2 selectivity from 249 to 472 with reducing CO2 content from 1% to 0.1%. The feasibility of this FTM is exemplified by designing a two-stage enriching membrane cascade to further remove 90% of the CO2 in a residual coal flue gas containing 1.75% CO2. Techno-economic analysis indicates a low capture cost of $83.8/tonne. The marginal costs beyond 90% capture are also evaluated for a variety of residual flue gases, indicating that the FTM-based capture from the coal or cement plant residual flue gas is more cost effective than direct air capture.

以氨基酸盐为移动载体的催化运输膜(FTMs)在CO2浓度为0.05 ~ 20%的稀释原料气条件下,对其CO2/N2分离性能进行了表征。当CO2分压降低时,FTMs中的载流子饱和度降低,从而提高了CO2渗透率和CO2/N2选择性。含2-(1-哌嗪基)乙胺肌氨酸盐的最佳FTM的CO2渗透率从1968 ~ 3822 GPU上升,CO2/N2选择性从249 ~ 472提高,CO2含量从1%降至0.1%。通过设计一个两级富集膜级,进一步去除含CO2 1.75%的残余煤烟气中90%的CO2,验证了该FTM的可行性。技术经济分析表明,捕集成本较低,为每吨83.8美元。还对各种残余烟道气体超过90%捕获量的边际成本进行了评估,表明基于ftm的燃煤或水泥厂残余烟道气体捕获比直接空气捕获更具成本效益。
{"title":"Mitigated carrier saturation of facilitated transport membranes for decarbonizing dilute CO2 sources: An experimental and techno-economic study","authors":"Yang Han ,&nbsp;W.S. Winston Ho","doi":"10.1016/j.memlet.2022.100014","DOIUrl":"10.1016/j.memlet.2022.100014","url":null,"abstract":"<div><p>The CO<sub>2</sub>/N<sub>2</sub> separation performances of facilitated transport membranes (FTMs) containing aminoacid salts as mobile carriers were characterized under dilute feed gases with 0.05–20% CO<sub>2</sub>. At a reduced CO<sub>2</sub> partial pressure, the carrier saturation in the FTMs was mitigated, which enhanced both the CO<sub>2</sub> permeance and CO<sub>2</sub>/N<sub>2</sub> selectivity. The best FTM containing 2-(1-piperazinyl)ethylamine sarcosinate exhibited an uprising CO<sub>2</sub> permeance from 1968 to 3822 GPU and an improved CO<sub>2</sub>/N<sub>2</sub> selectivity from 249 to 472 with reducing CO<sub>2</sub> content from 1% to 0.1%. The feasibility of this FTM is exemplified by designing a two-stage enriching membrane cascade to further remove 90% of the CO<sub>2</sub> in a residual coal flue gas containing 1.75% CO<sub>2</sub>. Techno-economic analysis indicates a low capture cost of $83.8/tonne. The marginal costs beyond 90% capture are also evaluated for a variety of residual flue gases, indicating that the FTM-based capture from the coal or cement plant residual flue gas is more cost effective than direct air capture.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100014"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000022/pdfft?md5=bc23429ddfd6e399497e81a45c762e84&pid=1-s2.0-S2772421222000022-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79170267","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
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
Q1 ENGINEERING, CHEMICAL 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

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 (Wed) - Capillary number (Cac) emulsion generation space.

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.

本文首次报道了用等孔膜乳化法制备10µm以下的纤维素微珠。采用光刻技术制备了具有孔间距离、孔径和直通式孔的聚对苯二甲酸乙酯膜。8 wt%的纤维素溶液的分散相通过膜孔挤压,形成,由于顶部搅拌器提供的剪切作用,纤维素溶液滴分散在由2 wt%和5 wt% Span在葵花籽油中组成的连续相中。与乙醇相转化后,10µm以下微珠的变异系数(CV) <45%是通过探索韦伯数(Wed) -毛细数(Cac)乳化液生成空间得到的。这些结果表明,通过光刻技术制造的等孔聚合物膜可以生产出低于10 μ m的纤维素微珠,在个人护理、食品和药品行业有广泛的应用。
{"title":"Production of sub-10 micrometre cellulose microbeads using isoporous membranes","authors":"Ekanem E. Ekanem ,&nbsp;Ainur Sabirova ,&nbsp;Ciarán Callaghan ,&nbsp;Janet L. Scott ,&nbsp;Karen J. Edler ,&nbsp;Suzana P. Nunes ,&nbsp;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) &lt; 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
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100018
Andrew L. Zydney

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.

孔隙收缩(或标准阻塞)模型被广泛用于描述各种悬浮液/溶液的过滤行为,尽管基本假设非互连圆柱形孔隙半径均匀减小在几乎任何系统中都不太可能有效。这一简短的交流提出了一种替代的阻塞模型,该模型基于对污染膜的有效渗透率的描述,考虑了通过膜的互联孔结构沉积的污染物周围和下面的流动。所得的过滤方程给出了与经典孔隙收缩模型非常相似的线性污染关系,包括导数图上的斜率,为成功使用孔隙收缩形式描述许多膜系统的通量下降行为提供了可能的理由。此外,这种新的堵塞模型很容易推广到沉积的污秽物可渗透流动的情况。这种新的复合介质堵塞模型不仅提供了恒压过滤过程中通量下降速率的有用表达式,而且还提供了对控制膜系统污染的潜在物理机制的见解。
{"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
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2021.100011
Maryam Irani, Nicholas León, Zhongyun Liu, William J. Koros

Gas separation membranes based on glassy polymers often show complex responses to feed compositions, membrane morphologies, and operating conditions. The well-known dual mode sorption and transport models are discussed here as tools to assess plasticization and competition effects in asymmetric morphologies. A framework is illustrated based on these models using polyimide asymmetric hollow fibers. This framework can also be applied to emerging polymer families such as thermally rearranged (TR) and polymers of intrinsic microporosity (PIM), to identify opportunities connected to their innate glassy natures.

基于玻璃状聚合物的气体分离膜通常对进料成分、膜形态和操作条件表现出复杂的响应。本文讨论了众所周知的双模式吸收和输运模型,作为评估不对称形态中塑化和竞争效应的工具。在这些模型的基础上,用聚酰亚胺不对称中空纤维构造了一个框架。该框架也可以应用于新兴聚合物家族,如热重排聚合物(TR)和固有微孔聚合物(PIM),以识别与其固有玻璃性质相关的机会。
{"title":"Overlooked glassy polymer attributes illustrated by asymmetric polyimide hollow fibers","authors":"Maryam Irani,&nbsp;Nicholas León,&nbsp;Zhongyun Liu,&nbsp;William J. Koros","doi":"10.1016/j.memlet.2021.100011","DOIUrl":"10.1016/j.memlet.2021.100011","url":null,"abstract":"<div><p>Gas separation membranes based on glassy polymers often show complex responses to feed compositions, membrane morphologies, and operating conditions. The well-known dual mode sorption and transport models are discussed here as tools to assess plasticization and competition effects in asymmetric morphologies. A framework is illustrated based on these models using polyimide asymmetric hollow fibers. This framework can also be applied to emerging polymer families such as thermally rearranged (TR) and polymers of intrinsic microporosity (PIM), to identify opportunities connected to their innate glassy natures.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100011"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000118/pdfft?md5=5dc7368d1a44eac957b5158da9bfb6b1&pid=1-s2.0-S2772421221000118-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79375190","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: 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
Q1 ENGINEERING, CHEMICAL 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

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. Thiotrichales were the main contributors to membrane fouling. The relative abundance of Thiotrichales significantly correlated with TMP (Pearson R = 0.996, p-value <0.001), indicating this order's contribution to membrane fouling. Other dominant orders in the mixed liquor after endogenous decay such as Rhizobiales, Burkholderiales, Rhodospirillales and Myxococcales, Flavobacteriales 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. Corynebacteriales and Oligoflexales showing increased relative abundance by 6.83 and 5.64 folds, respectively.

本研究利用新一代扩增子测序技术检测了在亚临界通量条件下运行的膜生物反应器中的膜污染和相关的微生物类群。膜在亚临界通量下运行,因此,直到内源性衰变才观察到污染。在高污泥龄和低食物微生物比(从0.15 gBOD/gMLVSS.d降至0.09 gBOD/gMLVSS.d)条件下,由于营养缺乏导致内源性腐烂。内源腐烂导致种数和种间均匀度急剧下降(分别为接种量的49.7%和58.9%)。内源性腐烂释放的溶解有机物和细胞碎片以及丝状细菌(如硫代三氯甲烷)的过度生长是膜污染的主要原因。Thiotrichales的相对丰度与TMP显著相关(Pearson R = 0.996, p值<0.001),表明该目对膜污染有贡献。混合液中其他优势目根瘤菌属(Rhizobiales)、Burkholderiales、红螺旋菌属(Rhodospirillales)、黏液球菌属(Myxococcales)、黄杆菌属(Flavobacteriales)等经内源腐烂后可产生胞外聚合物质,加重膜污染。污染层的微生物组成与混合液高度相似,部分丝状菌目如棒状菌目和寡链菌目的相对丰度分别增加了6.83倍和5.64倍。
{"title":"Linking endogenous decay and sludge bulking in the microbial community to membrane fouling at sub-critical flux","authors":"Anh Q. Nguyen,&nbsp;Luong N. Nguyen,&nbsp;Md Abu Hasan Johir,&nbsp;Huu Hao Ngo,&nbsp;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 &lt;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
Q1 ENGINEERING, CHEMICAL Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100021
Yunfei Xing, Yunlong Xue, Dujian Qin, Pengbo Zhao, Pei Li

Although pervaporation (PV) membranes based on crosslinked polyvinyl alcohol (PVA) exhibit high desalination performance, the thermal crosslinking process often takes several hours. Here, we report a microwave assisted method to reduce the crosslinking duration. Moreover, to the PVA crosslinking system, a MOF particle, UIO-66, was added to increase the microwave absorbing efficiency and improve the desalination property. As a result, the PVA crosslinking time decreased to 2 min and the water flux increased by 67% compared with the plain crosslinked PVA membrane.

虽然基于交联聚乙烯醇(PVA)的渗透蒸发(PV)膜具有很高的脱盐性能,但热交联过程通常需要几个小时。在这里,我们报道了一种微波辅助方法来缩短交联时间。此外,在PVA交联体系中加入MOF颗粒UIO-66,提高了微波吸收效率,改善了脱盐性能。与普通交联PVA膜相比,交联时间缩短至2 min,水通量提高67%。
{"title":"Microwave-induced ultrafast crosslinking of Poly (vinyl alcohol) blended with nanoparticles as wave absorber for pervaporation desalination","authors":"Yunfei Xing,&nbsp;Yunlong Xue,&nbsp;Dujian Qin,&nbsp;Pengbo Zhao,&nbsp;Pei Li","doi":"10.1016/j.memlet.2022.100021","DOIUrl":"10.1016/j.memlet.2022.100021","url":null,"abstract":"<div><p>Although pervaporation (PV) membranes based on crosslinked polyvinyl alcohol (PVA) exhibit high desalination performance, the thermal crosslinking process often takes several hours. Here, we report a microwave assisted method to reduce the crosslinking duration. Moreover, to the PVA crosslinking system, a MOF particle, UIO-66, was added to increase the microwave absorbing efficiency and improve the desalination property. As a result, the PVA crosslinking time decreased to 2 min and the water flux increased by 67% compared with the plain crosslinked PVA membrane.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"2 1","pages":"Article 100021"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000095/pdfft?md5=93f3085409a2bcd177baa3b033d87c3b&pid=1-s2.0-S2772421222000095-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87479614","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: 6
期刊
Journal of Membrane Science Letters
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1