Competitive Adsorption of Drugs from a Multi-Component Mixture on Sugarcane Bagasse
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Date
2023
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Abstract
This work examines the adsorption in single- and multi-solute adsorption experiments
of antibiotic and non-steroidal anti-inflammatory drugs, i.e., ciprofloxacin (CPX), sulfamethoxazole
(SMX), ibuprofen (IBU), and diclofenac (DCF), onto sugarcane bagasse. The maximum experimental
adsorption capacities of single components CPX, DCF, IBU, and SMX, were 0.98, 0.77, 0.61, and
0.51 mg/g, respectively, with decreases between 5 and 28% in multi-solute mixtures, assuming
competitive adsorption. The experimental data of a single drug fitted a pseudo-second-order model,
while the experimental isotherms fit the Freundlich model. The presence of CPX did not interfere
with the adsorption of other solutes. The adsorption of SMX was lower in the presence of adsorption
competitors than SMX single solution. The adsorption of binary systems adequately fitted the
Sheindorf–Rebhun–Sheintuch model. The results showed that the competition process depends on
each adsorbate and that sugarcane bagasse can adsorb drugs in multi-component systems.
Resumen
Keywords
sulfamethoxazole, Ibuprofen, Ciprofloxacin, Competitive adsorption, Diclofenac, Sugarcane bagasse