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Effects of ion-exchange on the pervaporation performance and microstructure of NaY zeolite membrane 被引量:1
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作者 Meihua Zhu Xingguo An +3 位作者 Tian Gui Ting Wu Yuqin Li Xiangshu Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第7期176-181,共6页
Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt.Different nitrate salts,including Co(NO_(3))_(2),Mg(NO_(3))_(2),Zn(NO_(3))_(2),Ca(NO_(3))_(2),Cu(NO_(3))_(2),K... Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt.Different nitrate salts,including Co(NO_(3))_(2),Mg(NO_(3))_(2),Zn(NO_(3))_(2),Ca(NO_(3))_(2),Cu(NO_(3))_(2),KNO_(3),and AgNO_(3),have great effects on the channel structure and water affinity of the NaY zeolite membrane.When the concentration of nitrate salt,ion-exchange temperature and time are 0.1 mol·L^(-1),50℃and 2 h,the ion-exchange degree order of NaY zeolites is Ag^(+)>K^(+)>Ca^(2+)>Zn^(2+)>>Co^(2+)>Mg^(2+).Especially,Ag^(+)and K^(+)cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work.BET surface,total pore capacity,pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono-and di-valent cations.Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange.When the ion-exchange solution is Zn(NO_(3))_(2),the total flux variation and separation factor variation of the NaY membrane(M-5)are -45% and 230% for separation of 10%(mass)H_(2)O/EtOH mixture by pervaporation,and the ion-exchanged membranes showed good reproducibility. 展开更多
关键词 NaY zeolite membrane ion-exchange PERVAPORATION
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A RAPID METHOD TO DETERMINE DIFFUSION COEFFICIENTS OF COUNTER-IONS IN AN ION-EXCHANGE MEMBRANE
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作者 徐铜文 何炳林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1997年第1期85-90,共6页
1 INTRODUCTIONRapid and precise methods to obtain the diffusion coefficients of counter-ions are im-portant for the characterization of ion exchange membranes.Many theoreticaldescriptions of ion transport in ion excha... 1 INTRODUCTIONRapid and precise methods to obtain the diffusion coefficients of counter-ions are im-portant for the characterization of ion exchange membranes.Many theoreticaldescriptions of ion transport in ion exchange membranes have been developed by usingthe principles of irreversible thermodynamics,or the Nernst-Planck equations.Fick’s law can also be used for the description of the transport of ions with equaldiffusivity.However,for counter-ions of different diffusivities,Nerst-Planck 展开更多
关键词 ion-exchange membrane diffusion COEFFICIENT Donnan DIALYSIS NERNST-PLANCK EQUATION
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Aqueous decoupling batteries: Exploring the role offunctional ion-exchange membrane
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作者 Shuyue Li Lujing Wang +2 位作者 Xiaoman Li Heng Jiang Fei Du 《InfoMat》 SCIE CSCD 2024年第10期1-18,共18页
The relentless pursuit of sustainable and safe energy storage technologies hasdriven a departure from conventional lithium-based batteries toward other relevantalternatives. Among these, aqueous batteries have emerged... The relentless pursuit of sustainable and safe energy storage technologies hasdriven a departure from conventional lithium-based batteries toward other relevantalternatives. Among these, aqueous batteries have emerged as a promisingcandidate due to their inherent properties of being cost-effective, safe,environmentally friendly, and scalable. However, traditional aqueous systemshave faced limitations stemming from water's narrow electrochemical stabilitywindow (-1.23 V), severely constraining their energy density and viability inhigh-demand applications. Recent advancements in decoupling aqueous batteriesoffer a novel solution to overcome this challenge by separating the anolyteand catholyte, thereby expanding the theoretical operational voltage windowto over 3 V. One key component of this innovative system is the ion-selectivemembrane (ISM), acting as a barrier to prevent undesired crossover betweenelectrolytes. This review provides a comprehensive overview of recent advancementsin decoupling aqueous batteries, emphasizing the application of varioustypes of ISMs. Moreover, we summarize different specially designed ISMs andtheir performance attributes. By addressing the current challenges ISMs face,the review outlines potential pathways for future enhancement and developmentof aqueous decoupling batteries. 展开更多
关键词 ANOLYTE aqueous decoupling batteries CATHOLYTE design strategies ion-exchange membrane
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STUDY ON THE DIFFUSION OF Cu^(2+)-H^+ COUPLE IN A CATION EXCHANGE MEMBRANE——A RAPID METHOD TO DETERMINE SELF-DIFFUSION COEFFICIENTS OF COUNTER-IONS WITH UNEQUAL VALENCE 被引量:1
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作者 徐铜文 何炳林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1997年第2期83-89,共7页
1 INTRODUCTIONKnowledge of the basic transport phenomena of ions in an ion exchange membrane isimportant for the application of such a membrane.Various studies on the developmentof mathematical models for predicting a... 1 INTRODUCTIONKnowledge of the basic transport phenomena of ions in an ion exchange membrane isimportant for the application of such a membrane.Various studies on the developmentof mathematical models for predicting and correlating membrane transport rate havebeen published in recent years.More exact estimation of the diffusion coefficientshas been the subject of chief concern in many of these papers.For a bi-ionic systemwith the same valence,Sato et al.gave a method for estimating diffusion coefficients 展开更多
关键词 ion-exchange membrane diffusion coefficient Donnan dialysis Cu^(2+)-H^+ couple
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Advancing ion-exchange membranes to ion-selective membranes:principles,status,and opportunities 被引量:1
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作者 Hanqing Fan Yuxuan Huang Ngai Yin Yip 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第2期145-171,共27页
Ion-exchange membranes(IEMs)are utilized in numerous established,emergent,and emerging applications for water,energy,and the environment.This article reviews the five different types of IEM selectivity,namely charge,v... Ion-exchange membranes(IEMs)are utilized in numerous established,emergent,and emerging applications for water,energy,and the environment.This article reviews the five different types of IEM selectivity,namely charge,valence,specific ion,ion/solvent,and ion/uncharged solute selectivities.Technological pathways to advance the selectivities through the sorption and migration mechanisms of transport in IEM are critically analyzed.Because of the underlying principles governing transport,efforts to enhance selectivity by tuning the membrane structural and chemical properties are almost always accompanied by a concomitant decline in permeability of the desired ion.Suppressing the undesired crossover of solvent and neutral species is crucial to realize the practical implementation of several technologies,including bioelectrochemical systems,hypersaline electrodialysis desalination,fuel cells,and redox flow batteries,but the ion/solvent and ion/uncharged solute selectivities are relatively understudied,compared to the ion/ion selectivities.Deepening fundamental understanding of the transport phenomena,specifically the factors underpinning structure-property-performance relationships,will be vital to guide the informed development of more selective IEMs.Innovations in material and membrane design offer opportunities to utilize ion discrimination mechanisms that are radically different from conventional IEMs and potentially depart from the putative permeability-selectivity tradeoff.Advancements in IEM selectivity can contribute to meeting the aqueous separation needs of water,energy,and environmental challenges. 展开更多
关键词 ion-exchange membranes SELECTIVITY SEPARATIONS
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PREPARATION OF SA-Fe CATION EXCHANGE MEMBRANE AND IT’S APPLICATION IN ELECTRODIALYSIS FOR TREATING WASTEWATER
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作者 GENG Yamin CHEN Zhen +2 位作者 ZHENG Xi HUANG Xuehong CHEN Riyao 《Chinese Journal of Reactive Polymers》 2006年第2期141-145,共5页
An insoluble SA-Fe membrane was prepared by being linked soluble sodium alginate with FeCl3. SEM was used to observe its surface structure. 1R spectrum indicated that Fe^3+ was linked with -COOH and -OH in SA membran... An insoluble SA-Fe membrane was prepared by being linked soluble sodium alginate with FeCl3. SEM was used to observe its surface structure. 1R spectrum indicated that Fe^3+ was linked with -COOH and -OH in SA membrane. As a cationic exchanging membrane in electrodialysis the membrane was applied in treating inorganic wastewater with high concentration of inorganic ammonia and azote. The results of experiment showed that it was well-selective to ammonia and azote. The percentage of the removal of ammonia and azote in wastewater was up to 80%. 展开更多
关键词 Sodium alginate ion-exchange membrane ELECTRODIALYSIS Ammonia and azote
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Preparation and Performance of Bipolar Membranes with Liquid Ion-Exchange Medium
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作者 苏静 余立新 郝继华 《Tsinghua Science and Technology》 SCIE EI CAS 2003年第6期744-748,共5页
The current density is rather low in solid bipolar membranes, because the water transfer rate is relatively slow across solid bipolar membranes made of solid ion-exchange materials. This paper describes the use of po... The current density is rather low in solid bipolar membranes, because the water transfer rate is relatively slow across solid bipolar membranes made of solid ion-exchange materials. This paper describes the use of polymer solutions, such as phosphatic poly(vinyl alcohol) solution, poly(acrylic acid) solution and poly(vinyl alcohol) solutions with dispersed cation/anion-exchange resin particles to prepare bipolar membranes. The 0.1 mol/L NaOH and the 0.05 mol/L H 2SO 4 were used to test the performance of the bipolar membranes. For a fixed liquid layer thickness, both the current density and the selectivity increase with the concentration increase of a polyelectrolyte solution. The maximum current density measured in the experiment was 1497 A/m 2 with a selectivity of 96.8%. 展开更多
关键词 bipolar membrane ion-exchange PREPARATION ELECTRODIALYSIS
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Obtaining Bacteriocins by Chromatographic Methods 被引量:1
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作者 Valery Borzenkov Vladimir Surovtsev Ivan Dyatlov 《Advances in Bioscience and Biotechnology》 2014年第5期446-451,共6页
Bacteriocins are a large group of chromosome or plasmid-encoded and ribosomally synthesized low-molecular-weight (2 to 6 kDa) antimicrobial and amphiphilous peptides produced by Gr+ or Gr- bacteria [1]. Their low toxi... Bacteriocins are a large group of chromosome or plasmid-encoded and ribosomally synthesized low-molecular-weight (2 to 6 kDa) antimicrobial and amphiphilous peptides produced by Gr+ or Gr- bacteria [1]. Their low toxicity as well as the absence of allergenicity and reactogenicity is confirmed by testing selected bacteriocins [2] [3]. Bacteriocins can be widely used as preservatives and antibiotic alternatives in medicine. Nisin, a Streptococcus lactis-derived bacteriocin, has been in practice in food industry for a long time. A relevant product contains about 2.5% of nisin. For medical use (e.g., when injected into the blood stream), highly purified drugs are required. However, the yield of bacteriocins accounts for no more than a few percents from the total activity in the culture liquid. In this paper, we propose methods (by example of two B. subtilis strains), allowing to increase the yield up to ~80%. It is believed that other bacteriocins may be purified by these methods and with the same yield. 展开更多
关键词 PURIFICATION BACTERIOCINS Surface Cell FRAGMENTS HYDROPHOBICITY membranes ion-exchange HYDROPHOBIC CHROMATOGRAPHY
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Concentration of Hydrochloric Acid by Pervaporation Membrane Separation Process
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作者 李文俊 祁洁 《Chinese Science Bulletin》 SCIE EI CAS 1994年第20期1697-1701,共5页
Hydrogen chlorid (HC1) used in chemical industry and laboratory is usually obtainedfrom concentrated hydrochloric acid (approximately 37% of HC1) through distillation,When the hydrogen chloride content in concentrated... Hydrogen chlorid (HC1) used in chemical industry and laboratory is usually obtainedfrom concentrated hydrochloric acid (approximately 37% of HC1) through distillation,When the hydrogen chloride content in concentrated hydrochloric acid is extracted 展开更多
关键词 membrane SEPARATION PERVAPORATION ion-exchange membrane CONCENTRATION of hydrochloric acid.
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Salinity exchange between seawater/brackish water and domestic wastewater through electrodialysis for potable water 被引量:1
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作者 Mourin Jarin Zeou Dou +2 位作者 Haiping Gao Yongsheng Chen Xing Xie 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第2期19-28,共10页
Two-thirds of the world’s population has limited access to potable water.As we continue to use up our freshwater resources,new and improved techniques for potable water production are warranted.Here,we present a gene... Two-thirds of the world’s population has limited access to potable water.As we continue to use up our freshwater resources,new and improved techniques for potable water production are warranted.Here,we present a general concept called“salinity exchange”that transfers salts from seawater or brackish water to treated wastewater until their salinity values approximately switch,thus producing wastewater with an increased salinity for discharge and desalinated seawater as the potable water source.We have demonstrated this process using electrodialysis.Salinity exchange has been successfully achieved between influents of different salinities under various operating conditions.Laboratory-scale salinity exchange electrodialysis(SEE)systems can produce high-quality desalinated water at~1 mL/min with an energy consumption less than 1 kWh/m3.SEE has also been operated using real water,and the challenges of its implementation at a larger scale are evaluated. 展开更多
关键词 DESALINATION Potable water reuse ion-exchange membrane Salinity gradient energy Wastewater discharge
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SEPARATION OF DIOXANE/WATER MIXTURES BY PERVAPORATION
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作者 李文俊 钟伟 +1 位作者 郑文跃 薛碚华 《Chinese Science Bulletin》 SCIE EI CAS 1992年第4期334-337,共4页
Pervaporation as a membrane technique of liquid mixtures separation has been rapidly developed recently. The separation process is as follows: the feed is placed in contact with upstream side of membrane, the downstre... Pervaporation as a membrane technique of liquid mixtures separation has been rapidly developed recently. The separation process is as follows: the feed is placed in contact with upstream side of membrane, the downstream side of the membrane is kept under vacuum or under a stream of inert gas. If one of the components of the liquid mixture can 展开更多
关键词 PERVAPORATION ion-exchange membrane membrane SEPARATION dioxane/water MIXTURE
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