4.7 Article

A comprehensive study on paracetamol and ibuprofen adsorption onto biomass-derived activated carbon through experimental and theoretical assessments

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JOURNAL OF MOLECULAR LIQUIDS
卷 376, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.molliq.2023.121457

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Activated carbon; Biomass-based adsorbents; Paracetamol; Ibuprofen; Adsorption modelling

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The paper presents experimental and theoretical research on the adsorption of paracetamol (PCM) and ibuprofen (IBP) on a new activated carbon derived from Erythrina speciosa tree pods. The adsorbent exhibits excellent porous properties with a BET surface area of 795.1 m2/g and an average pore volume of 0.422 cm3 g-1. The adsorption tests show that the maximum adsorption capacity of both IBP and PCM is achieved at pH = 3, where the adsorbate molecules are in their neutral form. The theoretical analysis suggests that both IBP and PCM are adsorbed through a multi-molecular mechanism on the surface of the adsorbent.
The paper reports an experimental and theoretical work about the adsorption of paracetamol (PCM) and ibuprofen (IBP) onto a new activated carbon synthesized starting from the tree pods deriving from Erythrina speciosa. The adsorbent shows good porous properties, with a BET surface area of 795.1 m2/g, and an average pore volume of 0.422 cm3 g-1. Adsorption tests are carried out by varying the most important operating parameters. The adsorption capacity of both IBP and PCM results to be maximum at pH = 3, i.e., where the adsorbate molecules are found in neutral form. Adsorption isotherms indicated that IBP adsorption capacity increases with temperature up to 96.28 mg g-1, while an opposite trendwas retrieved for PCM, which decreased until 50.40 mg g-1. For a theoretical analysis, a double layer model (DLM) is adopted in order to provide an interpretation of the occurring adsorption mechanisms. The theoretical approach indicates that both IBP and PCM are adsorbed bya multi-molecular way, i.e. each functional group on the adsorbent surface accommodates more than one molecule at the same time. Finally, the adsorption energy reveals that a physical adsorption is responsible for both IBP and PCM adsorption on the synthesized adsorbent.

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