Ion-exchange preconcentration and group separation of ionic and neutral organic compounds

Schmidt, Luther W.; Fritz, James S.

doi:10.1016/0021-9673(93)80176-9

Cited by 16 publications

(7 citation statements)

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“…The final product was then rinsed with deionized water until the pH of the liquid was neutral. 10 The obtained ion-exchange resin was named as 1180H.…”

Section: Methodsmentioning

confidence: 99%

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Adsorption Study of Glycerol in Biodiesel on the Sulfonated Adsorbent

Chen

Wang

Liu

et al. 2012

Ind. Eng. Chem. Res.

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The adsorption isotherm data of glycerol from biodiesel (FAME, fatty acid alkyl esters) onto the sulfonated adsorbent were obtained via batch equilibrium tests at different temperatures in the range of 303–323 K. Subsequently, these data were fitted by four isotherm models. Freundlich isotherm model was the best fitted (r 2 > 0.98), and the model parameter 1/n implied that the adsorption process was favorable. For the Dubinin–Radushkevich (D-R) isotherm model, the model parameter Q D decreased with increasing temperature, and the mean free energy of sorption (E) was less than 8 kJ mol–1. The results of Q D and E reflected the exothermic and physical properties of the adsorption process, respectively. The negative values of Gibbs free energy change (ΔG 0) and enthalpy change (ΔH 0) indicated that the adsorption occurs spontaneously with an exothermic nature, while the positive values of entropy change (ΔS 0) suggested the increase in randomness at the solid–liquid interface during adsorption. The isosteric heat of adsorption (ΔH X) suggested that strong hydrogen bonding between glycerol and the −SO3 – groups of the sulfonated adsorbent dominated the adsorption process and that there existed adsorbate–adsorbate mutual attractive interaction. Furthermore, the existence of hydrogen bonding was also confirmed by infrared spectra.

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“…The final product was then rinsed with deionized water until the pH of the liquid was neutral. 10 The obtained ion-exchange resin was named as 1180H.…”

Section: Methodsmentioning

confidence: 99%

“…After 8 h, the reaction was stopped by slowly adding an excess of ice water and stirring the mixture in an ice bath. The final product was then rinsed with deionized water until the pH of the liquid was neutral . The obtained ion-exchange resin was named as 1180H.…”

Section: Methodsmentioning

confidence: 99%

Adsorption Study of Glycerol in Biodiesel on the Sulfonated Adsorbent

Chen

Wang

Liu

et al. 2012

Ind. Eng. Chem. Res.

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“…Recovery and purification of scandium from BR leachates is generally performed using either solvent extraction, ion-exchange chromatography, precipitation, or a combination of these techniques [9,[23][24][25][26][27][28]. Ion-exchange chromatography has the advantage of high preconcentration factors [29][30][31][32]. In BR leachates, the scandium concentration is in the order of several mg L -1 , whereas the inevitable impurities of base metals can reach the values of thousands of mg L -1 [24].…”

Section: Introductionmentioning

confidence: 99%

Selective ion-exchange separation of scandium(III) over iron(III) by crystalline α-zirconium phosphate platelets under acidic conditions

Avdibegović

Zhang

et al. 2019

Separation and Purification Technology

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“…Surface acetyl, hydroxymethyl, cyanomethyl, and sulfonate groups have been permanently affixed onto crosslinked polystyrene and the modified resins have been used to extract many types of organic analytes from aqueous solutions [46,48,49]. The capacity of the surface groups influences the SPE of analytes.…”

mentioning

confidence: 99%

Novel materials and methods for solid-phase extraction and liquid chromatography

Ambrose¹

1997

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Ion-exchange preconcentration and group separation of ionic and neutral organic compounds

Cited by 16 publications

References 5 publications

Adsorption Study of Glycerol in Biodiesel on the Sulfonated Adsorbent

Adsorption Study of Glycerol in Biodiesel on the Sulfonated Adsorbent

Selective ion-exchange separation of scandium(III) over iron(III) by crystalline α-zirconium phosphate platelets under acidic conditions

Novel materials and methods for solid-phase extraction and liquid chromatography

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