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Abstract
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 CaCl2 (GC1) and MgCl2 (GM1) at 1% wt/v and carbonized in CO2 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.
Highlights
Preparation of activated carbonsActivated carbons were prepared from African palm shell sieved to particle size of 4 mm and impregnant with solutions of CaCl2 (GC1) and MgCl2 (GM1) at 1% w/v, respectively in a GC1-200 GC1-100 GC1-H2O
Dataset of the immersion enthalpy of activated carbons chemically modified in methylparaben aqueous solution: Relation with adsorption
The risk associated with the presence of this pollutant in the environment is due to their classification as an endocrine disruptor [2]
Summary
Activated carbons were prepared from African palm shell sieved to particle size of 4 mm and impregnant with solutions of CaCl2 (GC1) and MgCl2 (GM1) at 1% w/v, respectively in a GC1-200 GC1-100 GC1-H2O. Thermostat bath at 358 K for 48 h. After that the samples were carbonized in CO2 flow at 1173 K for 6h. It was washed with HCl 5% and water to remove remain salts and dried for 24 h at 363 K
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