Contribution enthalpic in the interaction of activated carbon with polar and apolar solvents

Murillo-Acevedo, Yesid; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.1016/j.arabjc.2012.07.003

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…With regard to immersion enthalpy values, the values shown in this work (between −16.4 and −66.1 Jg −1 ) are consistent with previously reported values, these are between −25.23 and −127.8 Jg −1 for highly microporous activated carbons, with areas between 752 and 1208 m 2 g −1 [ 33 , 34 ].…”

Section: Introductionsupporting

confidence: 92%

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

2018

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The study of aliphatic compounds adsorption on activated carbon can be carried out from the energetic change involved in the interaction; the energy values can be determined from isotherms or by the immersion enthalpy. Vapor phase adsorption isotherms of hexane at 263 K on five activated carbons with different content of oxygenated groups and the immersion enthalpy of the activated carbons in hexane and water were determined in order to characterize the interactions in the solid–liquid system, and for calculating the hydrophobic factor of the activated carbons. The micropore volume and characteristic energy from adsorption isotherms of hexane, the BET (Brunauer–Emmett–Teller) surface area from the adsorption isotherms of N2, and the area accessible to the hexane from the immersion enthalpy were calculated. The activated carbon with the lowest content of oxygenated groups (0.30 µmolg−1) and the highest surface area (996 m2g−1) had the highest hexane adsorption value: 0.27 mmol g−1; the values for Eo were between 5650 and 6920 Jmol−1 and for ΔHim were between −66.1 and −16.4 Jg−1. These determinations allow us to correlate energetic parameters with the surface area and the chemical modifications that were made to the solids, where the surface hydrophobic character of the activated carbon favors the interaction.

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Section: Introductionsupporting

confidence: 92%

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

2018

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“…The immersion enthalpies obtained were exothermic, which was quite consistent with the enthalpies reported in the literature, where −Δ H im for benzene presented approximate values between 85 and 176 J g –1 ; cyclohexane between 29 and 102 J g –1 ; and hexane between 31 and 71 J g –1 . 3,23,24,50−52…”

Section: Resultsmentioning

confidence: 99%

Interaction between Hydrocarbons C₆ and Modified Activated Carbons: Correlation between Adsorption Isotherms and Immersion Enthalpies

2019

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Adsorption isotherms of benzene, cyclohexane, and hexane were determined from the gas phase on microporous activated carbons with Brunauer–Emmett–Teller areas between 816 and 996 m2 g–1. The Dubinin–Radushkevich equation was used to calculate the parameters of characteristic energy Eo and micropore volume Wo. Also, immersion enthalpies of activated carbons in solvents were obtained (benzene: −95.0 to −145.1 J g–1; cyclohexane: −21.2 to −91.7 J g–1; and hexane: −16.4 to −66.1 J g–1), and they were used to calculate the product EoWo with the Stoeckli and Kraehenbuehl equations. Subsequently, values of EoWo from the two techniques (between 512 and 2223 J cm3 mol–1 g–1 for the adsorption isotherms; between 1204 and 12008 J cm3 mol–1 g–1 for immersion enthalpies) were correlated with some characteristics of the adsorbate such as molecular size, the molar volume, and the dielectric constant. It was found that modifying the activated carbon affected the adsorption process, being favored by temperature changes and restricted by oxidation processes. The adsorbate, which showed the highest values for EoWo, was benzene, because it had a smaller molecular size and a higher dielectric constant.

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“…Next, the capture of the output electric potential started and the stabilization of the calorimeter until base line was achieved; later, the immersion of the sample into the liquid was performed and the resulting thermal changes were recorded until the baseline was attained again. Finally, a post-period was recorded, and the electric calibration was executed [1] , [2] , [3] , [4] .…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data of the immersion enthalpy of activated carbon in benzene and cyclohexane. Influence of the content of surface oxygenated groups

2019

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The objective of this data article is to show by calorimetric curves and the immersion enthalpies the differences between the interactions that occur when two activated carbons of different textural and chemical properties are put in contact with C6 compounds (an aromatic and a closed chain aliphatic: benzene and cyclohexane, respectively) in their pure state, and subsequently in mixtures thereof, with different molar composition. The greatest interaction occurs with the activated carbon that has the lower content of oxygen groups on the surface, both for the pure solvents, as for the mixtures; As for wetting liquids, there is a greater interaction with benzene (−∆Him: 94.98–106.40 J g−1) than with cyclohexane (−∆Him: 21.23–65.97 J g−1). The immersion enthalpy values for the different molar fractions are between −36.51 and −79.69 J g−1 for the oxidized sample, and between −50.43 and −85.59 J g−1 for the sample without chemical modification.

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Contribution enthalpic in the interaction of activated carbon with polar and apolar solvents

Cited by 11 publications

References 15 publications

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

Interaction between Hydrocarbons C₆ and Modified Activated Carbons: Correlation between Adsorption Isotherms and Immersion Enthalpies

Data of the immersion enthalpy of activated carbon in benzene and cyclohexane. Influence of the content of surface oxygenated groups

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Contribution enthalpic in the interaction of activated carbon with polar and apolar solvents

Cited by 11 publications

References 15 publications

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry

Interaction between Hydrocarbons C6 and Modified Activated Carbons: Correlation between Adsorption Isotherms and Immersion Enthalpies

Data of the immersion enthalpy of activated carbon in benzene and cyclohexane. Influence of the content of surface oxygenated groups

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Interaction between Hydrocarbons C₆ and Modified Activated Carbons: Correlation between Adsorption Isotherms and Immersion Enthalpies