Amoxicillin adsorption on ionic exchangers obtained from cassava peel (Manihot esculenta)
DOI:
https://doi.org/10.15665/rp.v22i1.3020Keywords:
Cassava peel, amoxicillin, citric acid, propylamine, adsorption, removal, kineticsAbstract
In this work, the adsorption of amoxicillin on unmodified, propylamine-modified, and citric acid-modified cassava peels was studied at laboratory scale. Adsorption tests were carried out at amoxicillin initial concentrations of 100 and 300 mg/l at pH values of 5, 6, 7, and 8, for each of the obtained adsorbents. The adsorption capacity results showed that the best pH of operation is 8 with a time of equilibria of 420 min. The kinetic data were fitted to the pseudo-first and pseudo-second order models obtaining better results with the last one and values for K2 of 2.13 g/mmol·min for unmodified cassava peels, 1.74 g/mmol·min for citric acid-modified cassava peels and 1.52 g/mmol·min for propylamine-modified cassava peels, respectively. The maximum removal percentage and maximum adsorption capacity were 34.4% and 0.016 mmol/g, for unmodified cassava peels; 50.39% and 0.024 mmol/g, for citric acid-modified cassava peels; and 50.93% and 0.024 mmol/g, for propylamine-modified cassava peels, respectively.
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