Ingeniería Ambiental-Pregrado

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Browsing Ingeniería Ambiental-Pregrado by Subject "Adsorción"

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    Adsorción de ciprofloxacina y diclofenaco sobre arcillas naturales e hidrolizadas usando vasos agitados
    (Universidad de Cuenca, 2023-02-14) Abad Delgado, Alex David; Ponce Montalvo, Jonathan Daniel; Peñafiel Tenorio, María Eulalia
    Emerging contaminants such as ciprofloxacin and diclofenac are not adequately removed in wastewater treatment plants, affecting the environment. These drugs are of particular interest as they appear on the EU watch list. Several processes, such as adsorption on carbonaceous materials and agricultural waste, have been successfully tested. Against this background, the objective of this work was to find environmental, economical, and effective solutions for the removal of contaminants such as ciprofloxacin and diclofenac on clays in stirred vessel adsorption processes. The clays were characterized by determining the zero-charge point, functional groups, specific surface area, and adsorption capacity. In addition, acid hydrolysis was performed to increase their specific surface area and adsorption capacity, especially in the removal of DCF, which increased by 40 to 60%. All clays adsorbed ciprofloxacin up to 270 mg/g. Acid treatment did not significantly increase the adsorption capacity of this drug. Instead, hydrolyzed clays achieved the adsorption of diclofenac, which natural clays were unable to adsorb, indicating that ciprofloxacin has a greater affinity with clays than diclofenac. Finally, it was shown that the adsorption kinetics for all clays in the removal of CPX and DCF fit the pseudo-second-order model, indicating rapid adsorption. The equilibrium model that best fit for CPX was Freundlich, which suggests multi-layer adsorption, and for DCF was Langmuir, indicating monolayer adsorption.
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    Remoción de paracetamol por biosorción en tanque agitado usando cáscara de cacao y bagazo de caña de azúcar
    (2018) Freire Moncayo, Paola Salomé; Peñafiel Tenorio, María Eulalia
    The present titration work is part of the research project developed by the Center for Environmental Studies (CEA) of the University of Cuenca, Evaluation of emerging pollutants present in wastewater from the Ucubamba treatment plant and removal by biosorption techniques and phytoremediation, in which the removal of paracetamol was studied, using bagasse from sugarcane and cocoa husk as biosorbents. In the first place, the physical and chemical characterization of both biomasses was carried out, followed by the adsorption study, in which some parameters that have influence on the process were optimized, such as: biosorbent dose, pH, solute concentration, contact times and temperature. The results of the characterization tests showed that the biomasses are acidic and the FT-IR tests showed that the functional groups with oxygen are present in both biomasses, which added to the hydrophilic nature of the paracetamol, make the biosorbents adsorb to water, better than to the drug. Finally, the equilibrium isotherms obtained are similar to type III of the IUPAC classification, which indicates an unfavorable process for the adsorption of the solute, which is why the adsorption isotherms of both biomasses did not conform to the Langmuir models and Freundlich, the experimental data were adjusted to the Dubinin-Radushkevich model, which describes effective adsorption processes at high concentrations of solute.