Ion Exchangers

Arden, Thomas V.

doi:10.1002/14356007.a14_393

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…The difference in copper content between the HIXs containing Cu 2 O and the ones containing Cu 0 was due to the different ionic form of the functional groups (hydroxylic vs. ascorbate, molar mass 17 vs. 175). Since anion exchangers show low thermal stability [ 38 , 39 ], all the materials investigated in this study were dried in mild conditions (at 40 °C for 24 h). The test results, grouped according to the structure of the host materials (M, G) and the thermal decomposition medium (air, N 2 ), are presented in successive figures.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, in the parent resins (M, G) the functional ionogenic groups were surrounded by water molecules, which is referred to as solvation. This phenomenon is due to weak electrostatic interactions and results in the formation of a solvation envelope (a few water molecules thick) around polar functional groups [ 29 , 39 , 40 ]. After Cu 0 was deposited in the anion exchanger’s matrix the configuration near the active groups changed.…”

Section: Resultsmentioning

confidence: 99%

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Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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Hybrid ion exchangers (HIXs) containing fine Cu2O and Cu0 particles were subjected to thermal analysis in order to determine their hygroscopic water content (with regard to their anomalously low porosity) and to determine the effect of the oxidation state of the copper atom in the deposit on the thermal properties of composite materials. Commercially available anion exchangers, Amberlite IRA 900Cl (macroreticular, M) and Amberlite IRA 402OH (gel-like, G), were used as supporting materials. M/Cu2O, G/Cu2O, M/Cu and G/Cu, containing 4.3–8.4 wt% Cu, were subjected to thermal analysis under respectively air and N2. TG/DTG curves revealed that dry M/Cu and G/Cu contained as little as 7.2% and 4.3% hygroscopic water, while M/Cu2O and G/Cu2O contained respectively 10.6% and 9.4% (Cu0 was a stronger water repellent than Cu2O). The oxidation state of the copper atom in the deposit was found to affect the amount of the forming char, and also Cu0 was found to contribute to the formation of more char than in the pyrolysis of the pure resin (the anion exchanger with no copper deposit). Under air the two kinds of particles transformed into CuO, while under N2 metallic copper and char (from the resin phase) made up the solid residue. This means that in the pyrolysis of the HIXs the inorganic phase participated in char formation and it also transformed itself (undergoing reduction when possible). The above findings provide a basis for in-depth research aimed at the innovative use of copper-containing HIXs and at obtaining usable composite materials with a designed (organic-inorganic) composition.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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“…Parallel zur Entwicklung der Reaktivextraktion wurde in den 1950er Jahren versucht, funktionelle Gruppen an Aktivkohle oder Polymere zu binden [8,9], nachdem Gaus [10] 1905 erstmals Wasser mit natürlich vorkommenden Alumosilicaten enthärtete. Modifizierte Aktivkohlen, Zeolithe und feste Ionentauscherharze sind neben der Hauptanwendung zur Wasserbehandlung (Enthärten oder Entmineralisieren) in vielen industriellen Prozessen zu finden (Zuckerraffination, Schwermetallgewinnung, Säure-/Aminosäurereinigung, Fruchtsaftentsäuerung etc.…”

Section: Introductionunclassified

“…Modifizierte Aktivkohlen, Zeolithe und feste Ionentauscherharze sind neben der Hauptanwendung zur Wasserbehandlung (Enthärten oder Entmineralisieren) in vielen industriellen Prozessen zu finden (Zuckerraffination, Schwermetallgewinnung, Säure-/Aminosäurereinigung, Fruchtsaftentsäuerung etc. [9,11,12]). Der eigentliche Einsatz dieser selektiven Adsorberharze kommt in der präparativen Chromatographie zum Tragen.…”

Section: Introductionunclassified

Prozessintensivierung durch reaktive Carrier bei Reaktivextraktion und ‐sorption

Bart

2005

Chemie Ingenieur Technik

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Reaktivextraktion und ‐sorption haben neben Applikationen in der Umwelttechnik und Hydrometallurgie ein großes Einsatzpotential bei der Aufreinigung pharmazeutischer Wirkstoffe oder zur Gewinnung chemischer Verbindungen aus Naturstoffen. Eine schwierige Aufgabenstellung ist dann die aufwändige Trennung von optischen Isomeren bzw. die von Positionsisomeren. Dazu wird die Problematik der Auswahl der reaktiven Selektoren diskutiert, wobei Gemeinsamkeiten der beiden Trenntechniken herausgearbeitet werden. Es gibt auch die Möglichkeit, die Selektoren in Mizellen zu immobilisieren oder auf Trägerharze zu imprägnieren, um so neue Anwendungsfelder zu erschließen. Ergänzend dazu werden die möglichen apparativen Umsetzungen besprochen.

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“…The sulfonation temperature 70°C for 6 hours. To avoid deformation of the polymer matrix after sulfonation, the cooled polymer was washed with sulfuric acid, decreasing the concentration successively to 75, 50, 25 and 10% and then washed with distilled water until neutral wash water, then the resulting cation exchanger was dried at 80-90°C in a drying cabinet [10][11][12][13].…”

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confidence: 99%

Syntheses of Cation Exchanger With Macroporosity and Investigating Specific Properties

Alimdjanovna¹,

Turabdzhanov²,

Kedelbaev³

et al. 2020

OF THE ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHSTAN

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Obtained new strongly acid cation exchanger of macroporous structure based on furfural and dipheniloxide. The optimal amount of the poreformed agent and the molar ratio of the reacting substances were determined. Initially results showed that the polymer matrix using camphor as pore forming agent present a uniform surface with inter-connected pores and adding camphor into the polymer matrix could attain more abundant pores than adding n-heptane. We studied the components, surface and pore structures of the сation exchanger by Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). SEM observations showed that the resin abounded in macropores as large as 7.4 to 22.6 µm both in the surface and the interior. The parameters of the porous structure of the samples are calculated using by equation BET (Brauner., at al.) and the total pore volume of ion exchangers and the radius of submicroscopic capillaries were determined. Finally dates testing prototypes under application conditions, allow us to recommend this cation exchanger for sorption of small radius ions at high speed, as fundamentals upon receipt of ion exchangers, etc.

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Ion Exchangers

Cited by 12 publications

References 11 publications

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Prozessintensivierung durch reaktive Carrier bei Reaktivextraktion und ‐sorption

Syntheses of Cation Exchanger With Macroporosity and Investigating Specific Properties

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