Departamento de Ingeniería Química, Ambiental y de los Materiales
URI permanente para esta comunidadhttps://hdl.handle.net/10953/42
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Examinando Departamento de Ingeniería Química, Ambiental y de los Materiales por Materia "Adsorption"
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Ítem Acid insoluble lignin material production by chemical activation of olive endocarps for an efficient furfural adsorption-removal from aqueous solutions(Elsevier, 2024-01-22) Cuevas, Manuel; Moya-López, Alberto José; Hodaifa, Gassan; Sánchez-Villasclaras, Sebastián; Mateo, SoledadThe present work describes a protocol of chemical activation, with acid catalyst, of olive endocarps to obtain acid insoluble lignin-rich materials with high capacities for the adsorption of furfural present in aqueous media. During biomass activation, factors such as acid concentration, reaction time and temperature, solid/liquid ratio and the presence of water extractives strongly affected both the surface characteristics of the treated bioadsorbents and their capacities for furfural retention (percentage increase close to 600% with respect to the crude biomass). Once a treated solid with good adsorbent properties was obtained, the optimal conditions for adsorption were found: stirring speed 80 rpm, temperature 303 K and adsorbent load 7.5 g solid/50 cm3. Kinetic study indicated the pseudo-second order model provided the best fit of the experimental data. At 303 K, the equilibrium adsorption capacities values ranged from 2.27 mg g−1 to 29.29 mg g−1, for initial furfural concentrations between 0.49 gdm−3 and 12.88 gdm−3. Freundlich model presented the best isotherm (R2 = 0.996 and SE = 4.7%) providing 𝐾𝐹 and 𝑛 values of 0.115 (mg g−1) (mg dm−3)−𝑛 and 0.610, respectively. Since physical interactions predominate in the adsorption of furfural on chemically activated olive endocarps, the furfural removal process could have occurred reversibly on the heterogeneous surface of the bioadsorbents.Ítem Valorization of olive endocarp from olive oil and table olive processing as a low-cost bioadsorbent for the removal of furfural from aqueous solutions(Elsevier, 2021-11-18) Mateo, Soledad; Moya-López, Alberto José; Hodaifa, Gassan; Sánchez-Villasclaras, Sebastián; Cuevas, ManuelFurfural presence in fermentation culture media provokes an inhibition effect in yeast growth. In fact, is a key toxin in lignocellulosic hydrolyzates. This research work attempts to analyze the use of olive endocarp (OE) as adsorbent to remove furfural from aqueous solutions. The adsorption experimental sets studied the effect of particle size, agitation speed, adsorbent load, temperature, and initial furfural concentration. As results, higher adsorption percentages were observed when fragmented OE was smaller than 1.2 mm, agitation speed in the range 80–250 rpm, and the adsorbent load was 90 g OE/300 cm3 of furfural solution (1 g dm-3). The equilibrium adsorption capacities, qe, values were varied from 0.270 to 4.750 mg g-1 for initial furfural concentrations of 0.78 g dm-3 to 5.89 g dm-3. The adsorption data fit to pseudo-second order kinetic model showed good fit values (R2 ≥ 0.997, SE ≤ 5%). Dubinin-Radushkevich (DR) model was considered as the best fit (R2 = 0.999, SE =2.95%) for the different studied isotherms. An adsorption free energy value of 896 J mol-1 indicated a physical adsorption mechanism. Remarkable increases in furfural adsorption percentages have been achieved submitting natural olive endocarps to acid treatments.