Features of the Dependence of the Retention Indices of Sorbates in Reversed-Phase High-Performance Liquid Chromatography on the Content of Organic Solvents in the Eluent

Зенкевич, И. Г.; Deruish, A.; Nikitina, D. A.

doi:10.1134/s0036024423050321

Cited by 3 publications

(2 citation statements)

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“…Intensifying the solvation of adsorbate molecules by the solvent as the organic component concentration increases accounts for the observed pattern described by the Snyder model [43]. This trend is similar to that observed for traditional stationary phases used in HPLC, such as chemically modified silicas and porous graphitic carbon [43,44]. The data presented in Table 6 facilitate optimizing the conditions of HPLC separation utilizing HPSNs.…”

Section: Enthalpies and Entropies Of Adsorptionsupporting

confidence: 72%

“…However, the values of ∆ a H* and ∆ a S* (enthalpy and entropy changes, respectively) increase in absolute value with the rise of the MeCN volume fraction in the eluent. This observed pattern is unusual for HPLC [43,44]. The most substantial adsorption binding and maximum localization of adsorbed molecules in the polymeric matrix occur when the adsorption is from the MeCN-H 2 O mixture with the highest content of the organic modifier.…”

Section: Enthalpies and Entropies Of Adsorptionmentioning

confidence: 89%

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Thermodynamic Characteristics and Selectivity of the Liquid-Phase Adsorption of Aromatic Compounds on Hypercrosslinked Polystyrene Networks with Ultimate-High Crosslinking Densities by Data of Liquid Chromatography

Saifutdinov,

Buryak

2024

IJMS

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This study delves into the thermodynamics of liquid-phase adsorption on hypercrosslinked polystyrene networks (HPSNs), widely recognized for their distinct structure and properties. Despite the considerable progress in HPSN synthesis and characterization, gaps persist regarding the chromatographic retention mechanism, thermodynamics of adsorption, and their impact on the adsorption selectivity, especially in the case of networks with ultra-high crosslinking densities (up to 500%). Utilizing high-performance liquid chromatography (HPLC), we have explored, for the first time, the thermodynamic intricacies of liquid-phase adsorption onto HPSNs crosslinked in the entire range of the crosslinking degree from 100 to 500%. Our findings reveal the dependences of thermodynamic characteristics and selectivity of adsorption on the crosslinking degree, textural features, and liquid-phase composition in the region of extremely low adsorbent surface coverages (Henry’s range). We have detected that, in the case of HPSNs, the dependence of the thermodynamic characteristics of adsorption on the liquid-phase composition is different than for classical HPLC stationary phases. Moreover, we scrutinize the impact of the molecular structure of the studied aromatic compounds on the thermodynamic characteristics and selectivity of the liquid-phase adsorption on HPSNs. Investigating liquid-phase adsorption selectivity, we demonstrate the pivotal role of π-π interactions in separating aromatic compounds on HPSNs. Eventually, we unveil that the thermodynamic characteristics of adsorption peculiarly depend on the crosslinking degree due to the profound impact of the crosslinking on the electronic density in benzene rings in HPSNs, whereas the separation throughput peaks for the polymer with a 500% crosslinking degree, attributed to its exceptionally rigid network structure, moderate swelling and micropore volume, and minimum specific surface area.

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Section: Enthalpies and Entropies Of Adsorptionsupporting

confidence: 72%

Section: Enthalpies and Entropies Of Adsorptionmentioning

confidence: 89%