Cardona Rodríguez, Yaneth
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Cardona Rodríguez
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Yaneth
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InaMat2. Instituto de Investigación en Materiales Avanzados y Matemáticas
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Publication Open Access TiO2/Al-PILC catalysts synthesized from a non-conventional aluminum source of aluminum and applied in the photodegradation of organic compounds(Springer, 2024-07-17) Cardona Rodríguez, Yaneth; Gil Bravo, Antonio; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThis study explores the transformative potential of Pillared InterLayered Clays (PILC) derived from non-conventional aluminum sources as catalytic supports in the synthesis of TiO2/catalysts for the efficient photodegradation of organic pollutants in water. Montmorillonite (Mt) and three alumina-pillared montmorillonite (PILC) synthesized using various aluminum sources, were impregnated with titanium to synthesize TiO2/catalysts. The successful synthesis of these materials was confirmed through several characterization techniques such as X-ray diffraction (XRD), N2 adsorption-desorption at -196 ºC, morphological analysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and Energy-Dispersive X-ray Spectrometry (EDX). The photolysis, adsorption, and catalytic behavior of the TiO2/catalysts were studied for the degradation of triclosan (TCS), 2,6-dichlorophenol (2,6-DCP), and bisphenol A (BPA). All synthesized catalysts surpassed the efficacy of commercial anatase, with TiO2/Al-PILC exhibiting superior performance in comparison to TiO2/Mt. Photodegradation was most effective under UV radiation, with TCS demonstrating the highest degradation (approximately 70%). Notably, Al-PILC samples, particularly those synthesized from saline slags, displayed enhanced properties. Among them, TiO2/Al-PILCAE exhibited the highest degradation rates under both UV and visible light, underlining the remarkable potential of saline slags as precursors for Al-PILC synthesis. This study provides valuable insights into the design and development of efficient catalysts for water treatment applications, paving the way for sustainable and effective solutions in the realm of environmental remediation.Publication Open Access A nonconventional aluminum source in the production of alumina-pillared clays for the removal of organic pollutants by adsorption(Elsevier, 2021-12-01) Cardona Rodríguez, Yaneth; Korili, Sophia A.; Gil Bravo, Antonio; Institute for Advanced Materials and Mathematics - INAMAT2; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThis study is the first to propose the use of aluminum saline slag as aluminum source in the synthesis of alumina pillared clays (Al-PILC). Aluminum was extracted from this waste using both alkaline and acid solutions and both were compared for preparation of the intercalation solutions used for the synthesis of Al-PILC. Variations in parameters such as [OH–]/[Al3+], Al/clay (mmol/g), clay/volume solution ratios and temperature were studied in the synthesis processes. The solids obtained were characterized by X-ray diffraction (XRD), N2 adsorption–desorption at −196 °C, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX), which confirmed that the pillaring process was successful. PILC obtained from both acid (Al-PILCAE) and alkaline (Al-PILCBE) extracts were evaluated as adsorbents for three organic pollutants, namely bisphenol A (BPA), 2,6-dichlorophenol (2,6DCP) and triclosan (TCS), in batch mode. The resulting adsorption capacities were compared with montmorillonite (Mt) and an Al-PILC prepared by the conventional method, namely, dropwise addition of an NaOH solution into an aluminum chloride solution (Al-PILCCM). In all cases, the effect of factors such as pH, initial concentration of pollutant, adsorbent dosages and contact time was studied. The kinetic and equilibrium results obtained were evaluated using both pseudo-first- and pseudo-second-order kinetics, and Langmuir, Freundlich and Sips equation isotherms for the equilibrium. The kinetic study showed that the time needed to reach equilibrium was 30, 900 and 510 min for BPA, 2,6DCP and TCS, respectively. Moreover, adsorption data showed that the Al-PILCAE and Al-PILCBE synthesized have excellent potential as adsorbents for 2,6DCP and TCS, removing 98.46% and 98.47% of these compounds, respectively.