Ion exchange properties of isolated tomato fruit cuticular membrane: Exchange capacity, nature of fixed charges and cation selectivity

Planta ◽  
1973 ◽  
Vol 109 (1) ◽  
pp. 73-93 ◽  
Author(s):  
J�rg Sch�nherr ◽  
Martin J. Bukovac
Keyword(s):  
Ion Exchange ◽  
Tomato Fruit ◽  
Exchange Capacity ◽  
Cuticular Membrane ◽  
Cation Selectivity ◽  
Fixed Charges ◽  
Exchange Properties

Synthesis and Ion Exchange Properties of Thermally Stable Titanium(IV) Vanadate: Separation of Sr2+ from Ca2+, Ba2+, and Mg2+

1972 ◽  
Vol 50 (13) ◽  
pp. 2071-2078 ◽  
Author(s):  
Mohsin Qureshi ◽  
K. G. Varshney ◽  
S. K. Kabiruddin
Keyword(s):  
Ion Exchange ◽  
Structural Changes ◽  
Exchange Capacity ◽  
Thermally Stable ◽  
Sodium Vanadate ◽  
Ion Exchange Capacity ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Separation Factors ◽  
Exchange Properties

A new, thermally stable, and highly strontium-specific inorganic ion exchanger, titanium(IV) vanadate, has been prepared by mixing 0.5 M solution of titanic chloride and sodium vanadate at pH 0–1. Its ion exchange capacity is 0.65 mequiv./g at 400 °C. Separation factors of Sr2+ with respect to Ba2+, Ca2+, and Mg2+ are 8, 11.8, and 33.3, respectively. Binary mixtures of Sr2+ with Ba2+, Ca2+, and Mg2+ have been separated. Calcium and magnesium are eluted with 0.001 M HNO3. Barium and strontium are eluted with 0.01 and 0.1 M HNO3, respectively. A new parameter ΔC/ΔT is proposed for the study of structural changes in inorganic ion exchangers.

scholarly journals Oxometalate-Glass Composites and Thin Films

1990 ◽  
Vol 180 ◽  
Author(s):  
Karin Moller ◽  
Thomas Bein ◽  
C. Jeffrey Brinker
Keyword(s):  
Thin Films ◽  
Ion Exchange ◽  
Sol Gel ◽  
Composite Films ◽  
Exchange Capacity ◽  
Exafs Spectroscopy ◽  
Gel Formation ◽  
Ion Exchange Capacity ◽  
Glass Composites ◽  
Exchange Properties

ABSTRACTNew glass-composites with ion exchange properties have been developed. Ammonium 12-molybdophosphate (AMP) (NH4)3PMo12O40, and ammonium 12-tungstophosphate (AWP) (NH4)3PW12O40, known for their ion exchange capabilities, are included either in preformed aerogels with defined pore size, or are added to sol-gel mixtures during the process of gel formation. Characterization is carried out by FTIR, Raman and EXAFS spectroscopy. Ion exchange capacities for the oxometalate precursors are determined for silver and rubidium and are compared to those of the glass composites. Glass composites show high ion exchange capacity, but some portion of the metalate complexes leaches from the glass during the procedure. This is in contrast to thin composite films, which have almost no porosity and do not show loss of metalate. EXAFS spectroscopy demostrates that the oxometalate microstructure is maintained in glass composites and that rubidium ions after ion exchange in glasses occupy similar cation positions as in the precursor compounds.

Study of BiPbO2NO3 for I-129 Fixation under Reducing Conditions

2000 ◽  
Vol 663 ◽  
Author(s):  
Takayuki Amaya ◽  
Atsushi Mukunoki ◽  
Mamoru Shibuya ◽  
Hiroshi Kodama
Keyword(s):  
Ion Exchange ◽  
Distribution Coefficient ◽  
High Salinity ◽  
Exchange Capacity ◽  
Iodide Ions ◽  
Low Salinity ◽  
Ion Exchange Reaction ◽  
Anion Exchange Capacity ◽  
Reducing Conditions ◽  
Exchange Properties

ABSTRACTLeaching of the iodide ion from BiPbO2I (BPI), BPI encapsulated in cement (BPIC) and AgI was studied in a low salinity solution and in a high salinity solution under reducing conditions. Although BPI released a limited amount of iodide ions (less than 1%) into the low salinity solution, it released more than 30% of iodide ions into the high salinity solution within 80 days. AgI released more than 30% of iodide ions into both low and high salinity solutions within 80 days. It was proved that BPI is more stable than AgI in the low salinity solution under reducing conditions. BPIC released a limited number of iodide ions (less than 5%) into both low and high salinity solutions. BPIC showed the best leach resistance in the high salinity solution.BiPbO2NO3 (BPN) was developed to remove iodide ions in a solution and fix them in BPI by the ion exchange reaction. Ion exchange properties under reducing conditions were studied. An anion exchange capacity of 1.0 mEq/g and a distribution coefficient of larger than 0.1 m3/kg were obtained in a solution at a pH of between 9 and 13. The advantages of the process using BPN for removing and immobilizing Iodine-129 were discussed from the standpoint of process simplification.

Synthesis and Ion-exchange Properties of Tantalum Arsenate

1975 ◽  
Vol 53 (17) ◽  
pp. 2586-2590 ◽  
Author(s):  
J. P. Rawat ◽  
S. Qasim Mujtaba
Keyword(s):  
Ion Exchange ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Tantalum Pentoxide ◽  
Sodium Arsenate ◽  
Ion Exchange Capacity ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Analytical Importance ◽  
Exchange Properties

A new inorganic ion-exchanger, tantalum arsenate, has been prepared under varying conditions. The exchanger prepared by mixing 0.1 M tantalum pentoxide and 0.1 M sodium arsenate in the ratio of 1:4 at pH 0 has been studied in detail for its ion-exchange capacity, pH titrations, and Kd values. The material can be prepared reproducibly. Its analytical importance has been established by the following quantitative separations: Zr4+ from Tm3+, Zr4+ from Eu3+, Pr3+ from Eu3+, and Pr3+ from Tm3+.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

scholarly journals Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

2021 ◽  
Vol 22 (3) ◽  
pp. 1415
Author(s):  
Veronika Sarapulova ◽  
Natalia Pismenskaya ◽  
Valentina Titorova ◽  
Mikhail Sharafan ◽  
Yaoming Wang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Volume Fraction ◽  
Exchange Capacity ◽  
Polymer Materials ◽  
Transport Numbers ◽  
Anion Exchange Membranes ◽  
Microheterogeneous Model ◽  
Pass Through ◽  
Pes Membrane

The interplay between the ion exchange capacity, water content and concentration dependences of conductivity, diffusion permeability, and counterion transport numbers (counterion permselectivity) of CJMA-3, CJMA-6 and CJMA-7 (Hefei Chemjoy Polymer Materials Co. Ltd., China) anion-exchange membranes (AEMs) is analyzed using the application of the microheterogeneous model to experimental data. The structure–properties relationship for these membranes is examined when they are bathed by NaCl and Na2SO4 solutions. These results are compared with the characteristics of the well-studied homogenous Neosepta AMX (ASTOM Corporation, Japan) and heterogeneous AMH-PES (Mega a.s., Czech Republic) anion-exchange membranes. It is found that the CJMA-6 membrane has the highest counterion permselectivity (chlorides, sulfates) among the CJMAED series membranes, very close to that of the AMX membrane. The CJMA-3 membrane has the transport characteristics close to the AMH-PES membrane. The CJMA-7 membrane has the lowest exchange capacity and the highest volume fraction of the intergel spaces filled with an equilibrium electroneutral solution. These properties predetermine the lowest counterion transport number in CJMA-7 among other investigated AEMs, which nevertheless does not fall below 0.87 even in 1.0 eq L−1 solutions of NaCl or Na2SO4. One of the reasons for the decrease in the permselectivity of CJMAED membranes is the extended macropores, which are localized at the ion-exchange material/reinforcing cloth boundaries. In relatively concentrated solutions, the electric current prefers to pass through these well-conductive but nonselective macropores rather than the highly selective but low-conductive elements of the gel phase. It is shown that the counterion permselectivity of the CJMA-7 membrane can be significantly improved by coating its surface with a dense homogeneous ion-exchange film.

Homologous Series of 2D Chalcogenides Cs–Ag–Bi–Q (Q = S, Se) with Ion-Exchange Properties

2017 ◽  
Vol 139 (36) ◽  
pp. 12601-12609 ◽  
Author(s):  
Jing Zhao ◽  
Saiful M. Islam ◽  
Shiqiang Hao ◽  
Gangjian Tan ◽  
Constantinos C. Stoumpos ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Homologous Series ◽  
Exchange Properties
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