Evaluación de la remoción del ibuprofeno mediante biosorción en tallos de rosas y posos de café

Abstract

In this investigation, the viability of stems of roses [SR] and coffee grounds was analyzed for the removal of ibuprofen. In the discontinuous process, different variables was optimized such as adsorbate and adsorbent concentration, contact time, pH and temperature, in order to analyze the process from the point of view of equilibrium, kinetic and thermodynamic. The chemical characterization showed that the surface of the two adsorbents was acidic. By FT-IR spectrophotometry, the variation between the spectra before and after the biosorption was analyzed, the changes of the bands around 3400 and, between 1600 and 1450 cm-1, it would be due to the Interaction of ibuprofen with biomass. High removal values were obtained with coffee grounds while SR showed a less favorable behavior under the same parameters, it is possible to indicate that only a 60,42% removal was obtained, so that these tests were maintained until this step.Thus, the results of coffee grounds showed that the maximum percentage of adsorption was 94,74% at pH=2, dose of biomass of 12 g/L, contact time of 60 min, initial concentration of 10 mg/L and temperature of 30 °C. The equilibrium adsorption study showed that the data fit better to the Langmuir isotherm and when modeling the kinetic data the results follow the pseudo second-order kinetics.