Equilibrium constants of the sorption of pyridinecarboxylic  acids by polystyrene type sulfocationite

The processes of sorption of pyridine-3-carboxylic (nicotinic) and pyridine-4-carboxylic (isonicotinic) acids by sulfonic acid cation exchangers of the polystyrene type (CU-2-4 and CU-2-8) from aqueous solutions with different pH values were studied. Analysis of the FTIR spectra of isonicotinic acid, isonicotinic acid sulfate, and CU-2-8 sulfonic cation exchanger filled with isonicotinic acid showed that pyridinecarboxylic acid is in the protonated form in the polymer phase. Experimental data of the equilibrium distribution of acids in the aqueous solution-cation exchange system have been obtained. The values of the equilibrium constants for ion exchange and ligand sorption processes involving various forms of pyridinecarboxylic acid, sulfonic cation exchanger, and protons were calculated. The equilibrium constants for the ion exchange of sulfocationite protons by pyridinecarboxylic acid cations from solution are in the range 3.3-4.4. The selectivity of sulfonic cation exchangers to cations increases in the sequences proton < nicotinic acid cation < isonicotinic acid cation. The values of the equilibrium constant for ligand sorption of molecules are 195-220 dm3/mol for isonicotinic acid and reach 320-330 dm3/mol for nicotinic acid, i.e. the sorption activity of the H-form of the cation exchanger is higher in relation to nicotinic acid molecules. A change in the amount of a crosslinking agent (from 4% to 8% divinylbenzene) in a polystyrene type sulfonic cation exchanger does not significantly affect its sorption activity towards pyridinecarboxylic acids.

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SELECTIVITY OF INTERPOLYMER SYSTEMS WITH RESPECT TO LANTHANUM IONS

Chemical Journal of Kazakhstan ◽

10.51580/2021-1/2710-1185.09 ◽

2021 ◽

Vol 73 (1) ◽

pp. 88-94

Author(s):

T.K. JUMADILOV ◽

◽

L.K. Yskak ◽

B. TOTKHYSKYZY ◽

N.Zh. ZHAMBYLBAY ◽

...

Keyword(s):

Polymer Chain ◽

Maximum Degree ◽

Cation Exchanger ◽

Sorption Activity ◽

Polymer Hydrogels ◽

Lanthanum Ions ◽

Sulfonic Cation Exchanger ◽

Remote Interaction ◽

Degree Of Extraction ◽

Degree Of Sorption

The paper deals with the sorption of lanthanum ions by an interpolymer system consisting of sulfonic cation exchanger KU2-8 and anion exchanger AV-17-8. To predict the sorption activity of the intergel system, the mutual activation of the KU2-8 sulfonic cationite with the AV-17-8 anionite in the aqueous medium was initially studied. Due to the mutual activation of hydrogels in the course of their remote interaction, the polymer macromolecules pass into a highly ionized state, which leads to a significant increase in the degree of extraction of lanthanum ions from polymer hydrogels in intergel vapors as compared to the initial polymers. We calculated the degree of extraction of lanthanum ions by the interpolymer system KU2-8: AV-17-8, the degree of binding of the polymer chain (in relation to lanthanum ions) with the initial ion exchangers and the interpolymer system KU2-8: AV-17-8. Based on the data obtained, a comparative analysis of the sorption of lanthanum ions by individual sorbents and an interpolymer system was carried out within the limits of the ratio KU2-8: AV-17-8 = 5: 1–1: 5. It has been established that the maximum degree of sorption of lanthanum ions by the KU2-8: AV-17-8 interpolymer system is observed within the ratio KU2-8: AV-17-8 = 2: 4 at 48 hours of remote interaction of the interpolymer system and is 54.73 mol. %, at which the degree of binding of the polymer chain is 6.15%

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STUDY OF THE EFFICIENCY OF SORPTION TREATMENT WATER FROM AMMONIUM IONS ON NATURAL AND ARTIFICIAL SORBENTS

Energy Technologies & Resource Saving ◽

10.33070/etars.3.2017.05 ◽

2017 ◽

pp. 42-48

Author(s):

I.N. Makarenko ◽

I.N. Trus ◽

A.I. Petrychenko ◽

A.Yu. Kiichenko

Keyword(s):

Calcium Ions ◽

Cation Exchanger ◽

Tap Water ◽

Acid Solutions ◽

Ammonium Ions ◽

Ion Concentrations ◽

Model Solutions ◽

Hydrochloric Acid Solutions ◽

Cation Exchangers ◽

Acid Cation

It was studied processes of ion-exchange water purification from ammonium ions from model solutions on cation exchangers and on zeolite. It was established dependencies ammonium sorption on the form of ion exchanger, the ratio of ammonium and calcium in water and the level of ion concentrations in solution. It was shown that the strongly acid cation exchanger KU-2-8 in Na+-form has a low selectivity for ammonium ions, in comparison with the H+-form. It was established that the sorption efficiency of ammonium ions on cation exchangers KU-2-8 and Dowex Mac-3 decreases in the presence of calcium ions. It was determined that regeneration of cation exchanger KU-2-8 was more effective when hydrochloric acid solutions were used. It was shown that ammonium sorption on zeolite from tap water goes in the same way as from model solutions. It was determined the boundary capacity of the zeolite for ammonium ions and it was amounted 40 mg/g. The regeneration of zeolite with a sodium chloride solution was investigated and it was established that the degree of regeneration reached 100 %. Bibl. 16, Fig. 6, Tab. 1.

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Esterification (etherification) products obtained in the presence of new sulfonic cation-exchanger type of polymeric catalysts

Chemistry and Technology of Fuels and Oils ◽

10.1007/s10553-012-0321-8 ◽

2012 ◽

Vol 47 (6) ◽

pp. 440-445

Author(s):

G. I. Amanullaeva ◽

A. G. Azizov ◽

R. V. Alieva ◽

A. S. Askerova

Keyword(s):

Cation Exchanger ◽

Sulfonic Cation Exchanger

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Enhanced defluoridation using reusable strong acid cation exchangers in Al3+ form (SAC-Al) containing hydrated Al(III) oxide nanoparticles

Chemical Engineering Journal ◽

10.1016/j.cej.2016.12.122 ◽

2017 ◽

Vol 314 ◽

pp. 192-201 ◽

Cited By ~ 8

Author(s):

Pornsawai Praipipat ◽

Medhat Mohamed El-Moselhy ◽

Kulyakorn Khuanmar ◽

Panomchai Weerayutsil ◽

Trung Thanh Nguyen ◽

...

Keyword(s):

Strong Acid ◽

Oxide Nanoparticles ◽

Cation Exchangers ◽

Acid Cation

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Nicotinic acid transport by brush border membrane vesicles from rabbit kidney

AJP Renal Physiology ◽

10.1152/ajprenal.1981.240.3.f185 ◽

1981 ◽

Vol 240 (3) ◽

pp. F185-F191 ◽

Cited By ~ 4

Author(s):

E. F. Boumendil-Podevin ◽

R. A. Podevin

Keyword(s):

Membrane Potential ◽

Nicotinic Acid ◽

Brush Border ◽

Brush Border Membrane ◽

Isonicotinic Acid ◽

Membrane Vesicles ◽

Brush Border Membrane Vesicles ◽

Rabbit Kidney ◽

Internal Space ◽

Acid Uptake

The transport of nicotinic acid was investigated in brush border membrane vesicles isolated from rabbit kidney. The imposition of a Na+ gradient (out to in) induced a transient stimulation of nicotinic acid uptake above its final equilibrium value. This stimulation was specific for Na+. The uptake of nicotinic acid by the brush border membranes represented transport into an internal space and occurred in the absence of significant nicotinic acid degradation. The Na+ gradient-dependent uptake of nicotinic acid was saturable, apparent Km = 0.3 mM. Uptake of nicotinic acid was inhibited by its two isomers: picolinic and isonicotinic acid. In contrast, pyridine derivatives with two carboxyl groups or an amide group in addition to the carboxyl group were without inhibitory effect. Evaluation of changes in membrane potential using the lipophilic cation triphenylmethylphosphonium demonstrated that conditions that transiently generated either an interior-positive or an interior-negative membrane potential failed to affect the Na+-dependent transport of nicotinic acid. These findings provide evidence of the existence on the luminal membrane of a Na+ gradient-dependent and electroneutral transport system for nicotinic acid.

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