Comparative calorimetry study of the phenol and acetaminophen adsorption on activated carbon in aqueous solution

Bernal, Valentina; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.15446/rcciquifa.v44n1.54284

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…Immersion enthalpy is produced by specific and non-specific active interactions during adsorption and is considered an important parameter to fully characterize solid-liquid systems. Its value depends on multiple factors such as surface area and adsorbent polarity [ 24 ]. Equation (5) describes the immersion enthalpy in terms of the interactions occurring in the system.…”

Section: Resultsmentioning

confidence: 99%

“…The two values of immersion enthalpy show the differences in the interactions between the adsorbate and the activated carbon with different functional groups on the surface and, in association with Gibbs energy and entropy values, can supplement the information provided by adsorption isotherms [ 24 ]. Table 4 shows the paracetamol immersion and interaction enthalpies on the three activated carbons at six different paracetamol concentrations (10, 50, 100, 200, 500 and 1000 mg L −1 ).…”

Section: Resultsmentioning

confidence: 99%

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Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

et al. 2017

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Paracetamol adsorption in acidic, neutral and basic media on three activated carbons with different chemistry surfaces was studied. A granular activated carbon (GAC) was prepared from coconut shell; starting from this sample, an oxidized activated carbon (GACo) was obtained by treating the GAC with a boiling solution of 6 M nitric acid, so to generate a greater number of oxygenated surface groups. In addition, a reduced activated carbon (GACr) was obtained by heating the GAC at 1173 K, to remove the oxygenated surface groups. Paracetamol adsorption was higher for GACr due to the lower presence of oxygenated surface functional groups. Moreover, adsorption was highest at neutral pH. The magnitude of the interactions between paracetamol molecules and activated carbons was studied by measuring the immersion enthalpies of activated carbons in solution of paracetamol at different concentrations and pH values and by calculating the interaction enthalpy. The highest value was obtained for GACr in a paracetamol solution of 1000 mg L−1 at pH 7, confirming that paracetamol adsorption is favoured on basic activated carbons at pH values near to neutrality. Finally, the Gibbs energy changes confirmed the latter result, allowing explaining the different magnitudes of the interactions between paracetamol and activated carbons, as a function of solution pH.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

et al. 2017

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“…Around 100 mg of each activated carbon was weighed into a glass ampoule with a fragile peak and the immersion of the sample into the liquid was performed. The resulting thermal changes were registered until baseline is stabilized again and finally, an electric calibration was done [4], [5].…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Dataset of the immersion enthalpy of activated carbons chemically modified in methylparaben aqueous solution: Relation with adsorption

2019

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Methylparaben (MePB) is a type of emerging contaminant [1] , commonly present in wastewater and surface water, widely used as preservatives in personal care products. The risk associated with the presence of this pollutant in the environment is due to their classification as an endocrine disruptor [2] . Two activated carbons obtained from African palm shell (Elaeis Guineensis) modified chemically by impregnation with CaCl 2 (GC1) and MgCl 2 (GM1) at 1% wt/v and carbonized in CO 2 atmosphere at 1173 K, were prepared. The process of adsorption of methylparaben from aqueous solution to activated carbon is due to the interactions between the adsorbate and the adsorbent, which can be quantified through the determination of immersion enthalpies in aqueous solutions of MePB, finding values of - 22.45 and −45.23 J g −1 for the immersion in the solution of 100 mg L −1 , -3.31 and −44.02 J g −1 for the immersion in the solution of 200 mg L −1 and -21.31 and −54.51 J g −1 , showing the highest values carbon GC1. To evaluate the efficiency of MePB adsorption on the obtained solids, Langmuir and Freundlich adsorption models were determined in order to relate the quantities adsorbed with the immersion enthalpies and know the intensity of the energy interactions between the MePB and the activated carbons.

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“…The determinations were performed in triplicate, the standard deviations were calculated, and the results are shown as means values. Finally, electrical calibration was performed by providing known electrical work to the calorimetric cell [43,44]. This calibration allows calculating such electrical work ( W elect ), in addition to the calorimeter constant ( K cal ), immersion energy or heat ( E imm ), and finally, the immersion enthalpy ( ΔH imm ), as shown in Equations (3)–(6).…”

Section: Methodsmentioning

confidence: 99%

Parabens Adsorption onto Activated Carbon: Relation with Chemical and Structural Properties

2019

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Parabens (alkyl-p-hidroxybenzoates) are antimicrobial preservatives used in personal care products, classified as an endocrine disruptor, so they are considered emerging contaminants. A raw version of activated carbons obtained from African palm shell (Elaeis guineensis) modified chemically by impregnation with salts of CaCl2 (GC2), MgCl2 (GM2) and Cu(NO3)2 (GCu2) at 2% wt/v and carbonized in CO2 atmosphere at 1173 K was prepared. The process of adsorption of methyl (MePB) and ethylparaben (EtPB) from aqueous solution on the activated carbons at 18 °C was studied and related to the interactions between the adsorbate and the adsorbent, which can be quantified through the determination of immersion enthalpies in aqueous solutions of corresponding paraben, showing the lowest-value carbon GM2, which has a surface area of 608 m2 × g−1, while the highest values correspond to the activated carbon GCu2, with a surface area of 896 m2 × g−1 and the highest content of surface acid sites (0.42 mmol × g−1), such as lactonic and phenolic compounds, which indicates that the adsorbate–adsorbent interactions are favored by the presence of these, with interaction enthalpies that vary between 5.72 and 51.95 J × g−1 for MePB adsorption and 1.24 and 52.38 J × g−1 for EtPB adsorption showing that the process is endothermic.

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Comparative calorimetry study of the phenol and acetaminophen adsorption on activated carbon in aqueous solution

Cited by 4 publications

References 23 publications

Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

Effect of Solution pH on the Adsorption of Paracetamol on Chemically Modified Activated Carbons

Dataset of the immersion enthalpy of activated carbons chemically modified in methylparaben aqueous solution: Relation with adsorption

Parabens Adsorption onto Activated Carbon: Relation with Chemical and Structural Properties

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