2019
DOI: 10.3390/molecules24030413
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Mechanisms of Methylparaben Adsorption onto Activated Carbons: Removal Tests Supported by a Calorimetric Study of the Adsorbent–Adsorbate Interactions

Abstract: In this study, the mechanisms of methylparaben adsorption onto activated carbon (AC) are elucidated starting from equilibrium and thermodynamic data. Adsorption tests are carried out on three ACs with different surface chemistry, in different pH and ionic strength aqueous solutions. Experimental results show that the methylparaben adsorption capacity is slightly affected by pH changes, while it is significantly reduced in the presence of high ionic strength. In particular, methylparaben adsorption is directly … Show more

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Cited by 41 publications
(15 citation statements)
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“…Another plausible explanation is that higher NaOH concentrations may reduce the solubility of the target contaminants by a 'salting out' effect. 57 For nitrobenzene, isoproturon, clopyralid and metaldehyde, the DE of the NaOH solutions was no greater than water at room temperature. Nitrobenzene is known to have a strong affinity for activated carbon (Fig.…”
Section: Desorption Of Single Contaminantsmentioning
confidence: 95%
“…Another plausible explanation is that higher NaOH concentrations may reduce the solubility of the target contaminants by a 'salting out' effect. 57 For nitrobenzene, isoproturon, clopyralid and metaldehyde, the DE of the NaOH solutions was no greater than water at room temperature. Nitrobenzene is known to have a strong affinity for activated carbon (Fig.…”
Section: Desorption Of Single Contaminantsmentioning
confidence: 95%
“…As is well known, two regions are distinguished on the surface: a nonpolar and hydrophobic one that has basic properties associated with regions rich in π electrons located in the graphene basal planes and another hydrophilic region containing various functional groups [30,31]. Thus, the carbons GC2 and GM2 possess the lowest acidity and highest basicity, as shown in Figure 3, which is usually associated with π-delocalized electrons in the graphenic layers of the carbonous structure, and have dispersive hydrophobic interactions [32] with the electrons in the aromatic ring of the ethylparaben [33,34]. Carbon GCu2, meanwhile, having a higher concentration of acid groups that decrease the electron density of the basal plans of the activated carbon, favors the specific interactions that are established between these groups and the phenol present in the structure EtPB.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, in order to evaluate the calorimetric effect of the specific interactions between parabens and activated carbons, the interaction enthalpy ( ∆ H int ) to both concentrations was determined, finding values from 5.72 to 51.95 J × g −1 for MePB and 1.24 to 52.38 J × g −1 for EtPB. As shown in Figure 6B, changes in the interaction enthalpy have positive values in all cases, suggesting that the process is endothermic and requires energy to be carried out; hence, it is usually associated with the breaking of interactions and water displacement by paraben molecules, which are much more apolar, and as the size of paraben molecule increases, the polarity of this decreases from the carbonaceous surface and the de-solvatation of the solute before adsorption [33]. Therefore, the EtPB–adsorbent interaction is stronger than that of MePB–adsorbent, so that π–π-type interactions are favored.…”
Section: Resultsmentioning
confidence: 99%
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“…Fig. 1 shows the calorimetric curves of the immersion of GC1 into water and MePB solutions of 100 y 200 mg L −1 showing that this carbon has a greater interaction with water and less interaction with the MEPB solutions since the area of the peak under the curve is smaller for the immersion in the solutions, indicating that the process is becoming increasingly endothermic as the concentration of MePB increases [7]. On the other hand, in Fig.…”
Section: Experimental Design Materials and Methodsmentioning
confidence: 99%