Granular activated carbons characterization by CO2 adsorption isotherms and immersion enthalpy

Gómez, Fernando; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.1007/s10973-015-4468-5

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…The values derived from calorimetric determinations were performed in triplicateand the standard deviation isbetween 0.33 and 2.65 Jg −1 . Based on the enthalpy of immersion in hexane and water, the hydrophobic factor of the solids was calculated with respect to hexane [ 46 ]. The enthalpy of immersion of hexane and water, as well as the hydrophobic factor are shown in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The area of the peak under the potential curve as a function of time is proportional to the amount of heat generated in the solid–liquid contact. It was observed that the activated carbon with the highest peak in the hexane immersion is the one that was heat-treated at 1173 K and had the lowest oxygenated group content at the surface, showing that the decrease of oxygenated groups on the surface increased the enthalpy of immersion of the solid in the aliphatic solvent [ 46 ]. The effect that the immersion produces increases the potential of the thermal sensor, indicating that the process is exothermic and involves interactions between the components of the solid–liquid system being studied.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

2018

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Physico-chemical characterization of activated carbon–metal oxide photocatalysts by immersion calorimetry in benzene and water

Barroso-Bogeat

Alexandre-Franco

Fernández-González

et al. 2016

J Therm Anal Calorim

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From a commercial activated carbon (AC) and Al 3? , Fe 3? , Zn 2? , SnCl 2 , TiO 2 and WO 4 2in water, three series of AC-metal (hydr)oxide (MO) samples prepared by wet impregnation in two successive steps of soaking at 80 °C and oven-drying at 120 °C (S1) and subsequent heat treatment at 200 (S2) or 850 °C (S3) were characterized texturally by N 2 adsorption at -196 °C and by immersion calorimetry in benzene and water. The mass changes associated with the preparation of the samples are usually stronger for S1 and S3 than for S2. The incorporation of MO to AC causes a greater decrease in the micropore volume and pore narrowing only for the SnCl 2 -impregnated sample. The opposite effects on the microporous structure are noted for most S2 and S3, as compared to S1. For AC, -D i H(C 6 H 6 ) is 114.0 J g -1 and -D i H(H 2 O) is 30.5 J g -1 . For the AC-MO samples, -D i H(C 6 H 6 ) and S tot (C 6 H 6 ) are generally lower than for AC and vary by S3 [ S2 [ S1. However, -D i H(H 2 O), S tot (H 2 O) and [O] are usually lower for S3. S tot (C 6 H 6 ) is higher for the samples prepared using the metal ions. The results of immersion calorimetry for AC and AC-MO samples provide one with valuable information concerning the dependence of the hydrophobicity and hydrophilicity of the samples on the method used in their preparation.

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Calorimetric study of the wettability properties of low-rank coal in the presence of CTAB

Liu

Fan

2017

J Therm Anal Calorim

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Granular activated carbons characterization by CO2 adsorption isotherms and immersion enthalpy

Cited by 7 publications

References 28 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

Physico-chemical characterization of activated carbon–metal oxide photocatalysts by immersion calorimetry in benzene and water

Calorimetric study of the wettability properties of low-rank coal in the presence of CTAB

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