Slow Proton Exchange in Aqueous Solution. Consequences of Protonation and Hydration within the Central Cavity of Preyssler Anion Derivatives, [|M(H2O)|⊃P5W30O110]n-

1999 ◽  
Vol 121 (48) ◽  
pp. 11164-11170 ◽  
Author(s):  
Kee-Chan Kim ◽  
Michael T. Pope ◽  
Gennaro J. Gama ◽  
Michael H. Dickman
Keyword(s):  
Aqueous Solution ◽  
Proton Exchange ◽  
Central Cavity

Enhanced adsorption removal of methyl orange from aqueous solution by nanostructured proton-containing δ-MnO2

2015 ◽  
Vol 3 (10) ◽  
pp. 5674-5682 ◽  
Author(s):  
Yan Liu ◽  
Chao Luo ◽  
Jian Sun ◽  
Haizhen Li ◽  
Zebin Sun ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Solid State ◽  
Solid State Reaction ◽  
Proton Exchange ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Adsorption Removal ◽  
Homogeneous Precipitation Method ◽  
Enhanced Adsorption

Two nanostructured proton-containing δ-MnO2 (H-δ-MnO2) materials were synthesized through proton exchange for K-containing δ-MnO2 (K-δ-MnO2) nanosheets and nanoparticles prepared by the hydrothermal homogeneous precipitation method and solid-state reaction.

Proton exchange of triethylammonium ion in aqueous solution

1967 ◽  
Vol 89 (12) ◽  
pp. 2963-2967 ◽  
Author(s):  
Earle K. Ralph ◽  
Ernest. Grunwald
Keyword(s):  
Aqueous Solution ◽  
Proton Exchange

scholarly journals Modification of Nafion Membranes by IL-Cation Exchange: Chemical Surface, Electrical and Interfacial Study

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
V. Romero ◽  
M. V. Martínez de Yuso ◽  
A. Arango ◽  
E. Rodríguez-Castellón ◽  
J. Benavente
Keyword(s):  
Aqueous Solution ◽  
Impedance Spectroscopy ◽  
Cation Exchange ◽  
Photoelectron Spectroscopy ◽  
Electrical Characterization ◽  
Proton Exchange ◽  
Supplementary Information ◽  
Membrane Thickness ◽  
Scanning Calorimetry ◽  
Nafion Membranes

Bulk and surface changes in two proton-exchange membranes (Nafion-112 and Nafion-117) as a result of the incorporation of the IL-cationn-dodecyltriethylammonium (or DTA+) by a proton/cation exchange mechanism after immersion in a DTA+aqueous solution were analysed by impedance spectroscopy (IS), differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), and contact angle measurements performed with dry samples of the original Nafion and Nafion-DTA+-modified membranes. Only slight differences were obtained in the incorporation degree and surface chemical nature depending on the membrane thickness, and DTA+incorporation modified both the hydrophobic character of the original Nafion membranes and their thermal stability. Electrical characterization of the dry Nafion-112 membrane was performed by impedance spectroscopy while different HCl solutions were used for membrane potential measurements. A study of time evolution of the impedance curves measured in the system “IL aqueous solution/Nafion-112 membrane/IL aqueous solution” was also performed. This study allows us monitoring the electrical changes associated to the IL-cation incorporation in both the membrane and the membrane/IL solution interface, and it provides supplementary information on the characteristic of the Nafion/DTA+hybrid material. Moreover, the results also show the significant effect of water on the electrical resistance of the Nafion-112/IL-cation-modified membrane.

scholarly journals Exploiting the Flexibility of the Pyrochlore Composition for Acid-Resilient Iridium Oxide Electrocatalysts in Proton Exchange Membranes

2021 ◽  
Author(s):  
David Burnett ◽  
Enrico Petrucco ◽  
Reza Jalili Kashtiban ◽  
Stewart F Parker ◽  
Jonathan Sharman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Proton Exchange Membranes ◽  
Iridium Oxide ◽  
Proton Exchange ◽  
Pyrochlore Oxides

Iridate pyrochlore oxides (Na,Ca)2-x(Ir2-yMy)O6·nH2O (M = Sb, Zr, Ru, Rh) are studied as resilient electrocatalysts for the oxygen evolution reaction under acid conditions. The materials crystallise from aqueous solution under...

Proton exchange with internal water molecules in the protein BPTI in aqueous solution

1991 ◽  
Vol 113 (11) ◽  
pp. 4363-4364 ◽  
Author(s):  
Gottfried Otting ◽  
Edvards Liepinsh ◽  
Kurt Wuethrich
Keyword(s):  
Aqueous Solution ◽  
Proton Exchange ◽  
Water Molecules ◽  
Internal Water

Synthesis and Evaluation of Resins for Actinide Separations

2002 ◽  
Vol 757 ◽  
Author(s):  
K. L. Noyes ◽  
N. Charton ◽  
Micheline Draye ◽  
K. R. Czerwinski
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Proton Exchange ◽  
Great Promise ◽  
Nitrate Salt ◽  
Experimental Conditions ◽  
Organic Solid ◽  
Target Metal ◽  
Polymerization Method ◽  
Separation Results

ABSTRACTMolecular imprinting techniques have shown great promise for applications in chemical separations, including those involving lanthanides and actinides. This work examines the production of a selective resin for Am separations. Due to practical difficulties, resins were not imprinted with Am, rather 3 resins were created with each of Sm, Nd, and Pr as the template ions. An analogous “blank” or unimprinted resin was also created. The nitrate salt of the target metal ion was dissolved in CH2Cl2 and the resin was created around the ions to provide a unique structure based upon each metal. These resins were synthesized by a radical polymerization method, producing a reusable organic solid. The resins were qualified by obtaining values for their proton exchange capacities and data to define their complexation thermodynamics. Proton exchange capacities were determined using an indirect titration and were found to be 10.08 meq/g for the Sm-imprinted resin, 7.25 meq/g for the Nd resin, and 7.14 meq/g for the Pr resin. Data for the resins' thermodynamics were obtained at pH 1–7 in steps of 0.5 units. Results show that the templated resins rapidly removed the target actinide from aqueous solution under experimental conditions. Best separation results for Am from Eu and Gd were obtained with the Nd imprinted resin.

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