scholarly journals Tailoring Activated Carbons for Efficient Downstream Processing: Selective Liquid‐Phase Adsorption of Lysine

ChemSusChem ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3614-3621
Author(s):  
Jeff Deischter ◽  
Nadja Wolter ◽  
Regina Palkovits
Keyword(s):  
Liquid Phase ◽  
Activated Carbons ◽  
Downstream Processing ◽  
Liquid Phase Adsorption

scholarly journals Enthalpic and Liquid-Phase Adsorption Study of Toluene–Cyclohexane and Toluene–Hexane Binary Systems on Modified Activated Carbons

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2839
Author(s):  
Diana Hernández-Monje ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Liquid Phase ◽  
Binary Systems ◽  
Activated Carbons ◽  
Solute Concentration ◽  
Adsorption Sites ◽  
Liquid Phase Adsorption ◽  
Adsorption Capacities ◽  
Textural Parameters ◽  
Solvent Molecules ◽  
Modified Activated Carbons

The liquid-phase adsorption of toluene in cyclohexane and hexane solutions on modified activated carbons was evaluated; the energy involved in the interaction between these solutions and the solids was determined by immersion enthalpies of pure solvents and their mixtures, and the contribution of the system constituents was calculated by differential enthalpies. The thermal treatment generated modifications that favored adsorption and interaction with the evaluated solutions, since it increased the textural parameters and the basic character of the samples. Cyclohexane could create greater competition with the adsorption sites compared to hexane, but it favored the increase in adsorption capacities (0.416 to 1.026 mmol g−1) and the interactions with the solid evaluated through the immersion enthalpies. The immersion enthalpies of pure solvents (−16.36 to −112.7 J g−1) and mixtures (−25.65 to −104.34 J g−1) had exothermic behaviors that were decreasing due to the possible displacement of solvent molecules when increasing the solute concentration in the mixtures. The differential enthalpies for toluene were negative (−18.63 to −2.14 J), mainly due to the π–π interaction with the solid, while those of the solvent–solid component tended to be positive values (−4.25 to 55.97 J) due to the displacement of the solvent molecules by those of toluene.

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