The effect of surface modification modes on proton-over-vanadium ion selectivity was studied by spin-coating chitosan-Phosphotungstic Acid(PWA)as a single or double layer on Nation membrane surface.To suppress the van...The effect of surface modification modes on proton-over-vanadium ion selectivity was studied by spin-coating chitosan-Phosphotungstic Acid(PWA)as a single or double layer on Nation membrane surface.To suppress the vanadium ions per-meation through the Nation membrane in a vanadium redox flow battery(VRFB),the single surface-modified Nation membrane(Nafion/chitosan-PWA)s and double surface-modified Nation membrane(Nafion/chitosan-PWA)D demonstrated a 89.9%and 92.7%reduction of vanadium ion permeability in comparison with pristine Nation,respectively.The(Nafion/chitosan-PWA)D exhibited better selectivity between proton and vanadium ions than the(Nafion/chitosan-PWA)s at the same layer thickness.Furthermore,the columbic efficiency for the VRFB single cell based on the(Nafion/chitosan-PWA)D at an optimized thickness was 93.5%and the energy efficiency was 80.7%at a charge-discharge current density of 30 mA.cm^(-2),which were higher than the(Nafion/chitosan-PWA)s and pristine Nation membrane.The modified membranes also possessed adequate chemical stability in the VRFB during charge-discharge cycling measurements.展开更多
Ionic liquids（ILs） immobilized on silica as novel high performance liquid chromatography（HPLC）stationary phases have attracted considerable attention. However, it has not been applied to protein separation. In thi...Ionic liquids（ILs） immobilized on silica as novel high performance liquid chromatography（HPLC）stationary phases have attracted considerable attention. However, it has not been applied to protein separation. In this paper, N-methylimidazolium IL-modified silica-based stationary phase（Silpr Mim）was prepared and investigated as a novel multi-interaction stationary phase charged positively for protein separation. The results indicate that all of the basic proteins tested cannot be absorbed on this novel stationary phase, whereas all of the acidic proteins tested can be retained, and the baseline separation of eight kinds of acidic protein standards can be achieved when performed in reversed phase/ion-exchange chromatography（RPLC/IEC） mode. Compared with commonly used commercial octadecylated silica（ODS） column, the novel stationary phase can show selectivity and good resolution to acidic proteins, which has a promising application in the separation and analyses of acidic proteins from the complex samples in proteomics. In addition, the chromatographic behavior of proteins, the effect of the ligand structure and the retention mechanism on this stationary phase were also investigated.展开更多
Ionic selectivity is of significant importance in both fundamental science and practical applications.For instance,an ion-selective material allows the passage of a particular kind of ions while blocking the others,wh...Ionic selectivity is of significant importance in both fundamental science and practical applications.For instance,an ion-selective material allows the passage of a particular kind of ions while blocking the others,which could be used for purification of materials.Herein,the Li-ion-selectivity of a garnet-type solid electrolyte is discussed by comparing the difference of activation energy between different ions migrating in solids.The high ion-selectivity is confirmed by harvesting high-purity metallic lithium(99.98 wt%)from low-lithium-purity sources(80 wt%)at a moderate temperature(190℃).This gives it huge potential in separating lithium with impurities especially alkali and alkali-earth elements.The cost of metallic lithium production is only 25%of the international lithium price.The proposed electrochemical metallic lithium separating method is advantageous compared with the traditional process in terms of efficiency,safety,and cost.展开更多
基金financially supported by grants from the National Natural Science Foundation of China(No.51422301)Beijing Higher Education Young Elite Teacher Project(No.29201493)the Fundamental Research Funds for the Central Universities(No.YWF-16-BJ-Y-68)
文摘The effect of surface modification modes on proton-over-vanadium ion selectivity was studied by spin-coating chitosan-Phosphotungstic Acid(PWA)as a single or double layer on Nation membrane surface.To suppress the vanadium ions per-meation through the Nation membrane in a vanadium redox flow battery(VRFB),the single surface-modified Nation membrane(Nafion/chitosan-PWA)s and double surface-modified Nation membrane(Nafion/chitosan-PWA)D demonstrated a 89.9%and 92.7%reduction of vanadium ion permeability in comparison with pristine Nation,respectively.The(Nafion/chitosan-PWA)D exhibited better selectivity between proton and vanadium ions than the(Nafion/chitosan-PWA)s at the same layer thickness.Furthermore,the columbic efficiency for the VRFB single cell based on the(Nafion/chitosan-PWA)D at an optimized thickness was 93.5%and the energy efficiency was 80.7%at a charge-discharge current density of 30 mA.cm^(-2),which were higher than the(Nafion/chitosan-PWA)s and pristine Nation membrane.The modified membranes also possessed adequate chemical stability in the VRFB during charge-discharge cycling measurements.
基金supported by the National 863 Program(No.2006AA02Z227)Natural Science Foundation of Shaanxi Province(No.2011JZ002)+1 种基金the Foundation of Key Laboratory in Shaanxi Province(Nos.2010JS103,11JS097,14JS098)Shaanxi Provincial Science and Technology Co-ordinating innovation projects(No.2013SZS18-K01)
文摘Ionic liquids（ILs） immobilized on silica as novel high performance liquid chromatography（HPLC）stationary phases have attracted considerable attention. However, it has not been applied to protein separation. In this paper, N-methylimidazolium IL-modified silica-based stationary phase（Silpr Mim）was prepared and investigated as a novel multi-interaction stationary phase charged positively for protein separation. The results indicate that all of the basic proteins tested cannot be absorbed on this novel stationary phase, whereas all of the acidic proteins tested can be retained, and the baseline separation of eight kinds of acidic protein standards can be achieved when performed in reversed phase/ion-exchange chromatography（RPLC/IEC） mode. Compared with commonly used commercial octadecylated silica（ODS） column, the novel stationary phase can show selectivity and good resolution to acidic proteins, which has a promising application in the separation and analyses of acidic proteins from the complex samples in proteomics. In addition, the chromatographic behavior of proteins, the effect of the ligand structure and the retention mechanism on this stationary phase were also investigated.
基金supported by the Basic Science Center Program of the National Natural Science Foundation of China(NSFC)under Grant No.51788104Beijing Natural Science Foundation under Grant No.JQ19005.
文摘Ionic selectivity is of significant importance in both fundamental science and practical applications.For instance,an ion-selective material allows the passage of a particular kind of ions while blocking the others,which could be used for purification of materials.Herein,the Li-ion-selectivity of a garnet-type solid electrolyte is discussed by comparing the difference of activation energy between different ions migrating in solids.The high ion-selectivity is confirmed by harvesting high-purity metallic lithium(99.98 wt%)from low-lithium-purity sources(80 wt%)at a moderate temperature(190℃).This gives it huge potential in separating lithium with impurities especially alkali and alkali-earth elements.The cost of metallic lithium production is only 25%of the international lithium price.The proposed electrochemical metallic lithium separating method is advantageous compared with the traditional process in terms of efficiency,safety,and cost.
