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Phosphonic acid transport

Nakamura, S., Ohashi, S., and Akiba, K., Transport of uranium(VI) through a liquid membrane impregnated with phosphonic acid ester. Buns. Kagaku Jpn. Anal, 1991, 40 829-834. [Pg.912]

It should be mentioned, that the transport properties of phosphonic acid, which has recently been used as protogenic group in fully polymeric proton conductors (see Section 23.4.2), seem to be similar to these of phosphoric acid... [Pg.720]

T. Sata, T. Yoshida and K. Matsusaki, Transport properties of phosphonic acid and sulfonic acid cation exchange membranes,./ Membr. Sci., 1996,120, 101-110. [Pg.78]

Figure 5.2 compares the change in PNaCa of a phosphonic acid membrane and that of a sulfonic acid membrane with the concentration of the mixed salt solution when 1 1 mixed salt solutions composed of calcium chloride and sodium chloride of various concentrations were electrodialyzed.26 PNaCa of the phosphonic acid membrane is lower than that of the sulfonic acid membrane. Transport numbers of all alkaline earth metal cations relative to sodium ions for the phosphonic acid membrane are also lower than those of the sulfonic acid membrane.26 However, the current efficiency of the phosphonic acid membrane was about 10% lower than that of the sulfonic acid membrane. Alkaline earth metal cations more... [Pg.141]

Figure 5.2 Comparison of transport number of calcium ions relative to sodium ions in a phosphonic acid membrane with that in a sulfonic acid membrane. ( ) sulfonic acid membrane (A) phosphonic acid membrane. 1 1 mixed salt solutions of calcium chloride and sodium chloride of different concentrations were electrodialyzed. Figure 5.2 Comparison of transport number of calcium ions relative to sodium ions in a phosphonic acid membrane with that in a sulfonic acid membrane. ( ) sulfonic acid membrane (A) phosphonic acid membrane. 1 1 mixed salt solutions of calcium chloride and sodium chloride of different concentrations were electrodialyzed.
In the present paper, we examine the influence of structural variation within series of crown ether carboxylic acid and crown ether phosphonic acid monoalkyl ester carriers upon the selectivity and efficiency of alkali metal transport across three types of liquid organic membranes. Structural variations within the carriers include the polyether ring size, the lipophilic group attachment site and the basicity of ethereal oxygens. The three membrane types are bulk liquid membranes, liquid surfactant (emulsion) membranes and polymer-supported liquid membranes. [Pg.87]

The ionizable crown ethers which were utilized in the metal ion transport studies include a series of dibenzo crown ether carboxylic acids 1-6 and a series of crown ether phosphonic acid monoethyl esters"2, (Figure 2). Within the first series, the crown ether ring sizeTs systematically varied from 14-crown-4 to 16-crown-5 to 19-crown-6 in compounds 1, 2 and 2 respectively. For compounds 2, 4 and 5, the crown etfier ring size is held constant but tTie attachment site of the lipophilic alkyl group is altered. Finally, for compounds 2 and 6, the crown ether ring size and lipophilic... [Pg.87]

The structural variation of crown ether ring size charge was examined in more detail with the crown ether phosphonic acid monoethyl ester series 2-10 for which the crown ether ring size is systematically varied fi nTl5-crown-5 to 18-crown-6 to 21-crown-7 to 24-croM-8. As sljpwn in Figure 6, 2 exhibit transport... [Pg.91]

Figure 6. Competitive Transport of Alkali Metal Cations Across Bulk Chloroform Membranes by Crown Ether Phosphonic Acid Monoethyl Esters 7-10. Figure 6. Competitive Transport of Alkali Metal Cations Across Bulk Chloroform Membranes by Crown Ether Phosphonic Acid Monoethyl Esters 7-10.
EFFECT OF PHOSPHONIC ACID ESTER PAE-6 ON ELECTRON TRANSPORT IN THYLAKOID MEMBRANES OF WHEAT AND BROAD BEAN... [Pg.1841]

Effect of Phosphonic Acid Ester PAE-6 on Electron Transport in Thylakoid Membranes of Wheat and Broad Bean 887... [Pg.3821]

B. Yue, L. Yan, S. Han, L. Xie, Proton transport pathways in acid-base complex consisting of phosphonic acid group and 1,2,3-triazolyl group, J. Phys. Chem. B 117 (2013) 7941-7949. [Pg.202]

All of these approaches still rely on water for conduction. Systems utilizing phosphonic acids, heteropolyacids, protic ionic liquids, and heterocyclic bases do not rely on water for conduction. One of the major issues for these systems, however, is that the acid or base aiding proton transport is generally water-soluble. The acid or base must be immobilized for use in transportation applications where condensation of liquid water under some of the operating conditions is inevitable. However, enough mobility must be retained by the active group to be able to participate in proton conduction. [Pg.448]

See other pages where Phosphonic acid transport is mentioned: [Pg.98]    [Pg.284]    [Pg.82]    [Pg.38]    [Pg.73]    [Pg.893]    [Pg.135]    [Pg.308]    [Pg.90]    [Pg.386]    [Pg.714]    [Pg.731]    [Pg.197]    [Pg.69]    [Pg.111]    [Pg.141]    [Pg.770]    [Pg.421]    [Pg.7208]    [Pg.90]    [Pg.38]    [Pg.308]    [Pg.38]    [Pg.11]    [Pg.61]    [Pg.129]    [Pg.98]    [Pg.1841]    [Pg.79]    [Pg.292]    [Pg.162]    [Pg.361]    [Pg.509]    [Pg.194]   
See also in sourсe #XX -- [ Pg.225 , Pg.226 , Pg.227 ]



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