Browsing by Author "Torres Palma, Ricardo A."
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Item Electroquímica, un enfoque verde para la sociedad del S.XXI(Editorial USC, 2019) Morales Morales, Jimmy Alexander; Amatore, Christian; Feliu, Juan Miguel; González Martínez, Ignacio; Rivera Iturbe, Fernando Felipe; García Ochoa, Esteban Miguel; Torresi, Roberto Manuel; Córdoba Torresi, Susana Inés; Orozco Holguín, Jahir; Torres Palma, Ricardo A.; Loaiza, Oscar Andrés; Calderón, Jorge A.; Meléndez, Ángel M.; Dector, Andrés; Quesada-Plata, Fabián E.; Pimi, Luca; Palma Goyes, Ricardo Enrique; Stiefvater, Robert; Casadiego Leal, Natalia Isabel; de Oliveira Junior, Renato Prado; Salazar Duque, Carlos Alberto;Item Manganese Dioxide Nanoparticles Prepared by Laser Ablation as Materials with Interesting Electronic, Electrochemical, and Disinfecting Properties in Both Colloidal Suspensions and Deposited on Fluorine-Doped Tin Oxide(2022-11) Corrales, Jhonatan; Acosta, Jorge; Castro, Sandra; Riascos, Henry; Serna Galvis, Efraim; Torres Palma, Ricardo A.; Ávila Torres, YennyNanoparticles (NPs) of α-MnO2 have high applicability in photoelectrochemical, heterogeneous photocatalysis, optical switching, and disinfection processes. To widen this panorama about MnO2 NPs, the formation of this material by laser ablation and deposition by dip-coating on fluorine-doped tin oxide (FTO), were considered in this study. The optical, spectroscopic, electrochemical characterization, and the evaluation of the antimicrobial activity, plus the photocatalytic response, were measured herein in colloidal media and deposited. For the deposition of NPs on FTO sheet, an anode is produced with a pseudocapacitive behavior, and 2.82 eV of band gap (GAP) in comparison with colloidal NPs for a value of 3.84 eV. Both colloidal suspension and deposited NPs have intrinsic antibacterial activity against two representative microorganisms (E. coli and S. aureus), and this biological activity was significantly enhanced in the presence of UVA light, indicating photocatalytic activity of the material. Thus, both the colloidal suspension and deposited NPs can act as disinfecting agents themselves or via light activation. However, an antibacterial behavior different for E. coli and S. aureus was observed, in function of the aggregation state, obtaining total E. coli disinfection at 30 min for deposited samples on FTO.Item Photochemical and photocatalytical degradation of antibiotics in water promoted by solar irradiation(Elsevier, 2020-01-24) Torres Palma, Ricardo A.; Serna Galvis, Efraím A.; Ávila Torres, YennySunlight is able to induce processes utilizable for the degradation of organic pollutants in water. In this chapter, the use of solar irradiation for the treatment of antibiotics by photolysis, classical heterogeneous photocatalysis, and photocatalysis based on nanomaterials is presented. Initially, the general aspects of antibiotics and their environmental impacts are considered. Then, the direct and mediated actions of sunlight on antibiotics are analyzed, focusing the discussion on aspects such as kinetics, transformations, and matrix effects. Next, some illustrative cases of application of TiO2-photocatalysis to eliminate antibiotics are addressed. The final section is devoted to photocatalysis based on nanomaterials for degrading antibiotics, paying special attention to their preparation, types of nanomaterials, and its application to the treatment of antibiotics in waters. The advantages and limitations of the applicability of photocatalytical systems for antibiotics elimination from water are also considered.