Capítulos (Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja)
URI permanente para esta colecciónhttps://hdl.handle.net/11441/10965
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Artículo Multicomponent Heavy Metals Adsorption on Functionalized Swelling Micas: Mechanistic Insights and Structural Evolution(Elsevier, 2025) Osuna, Francisco J.; Chaparro, Javier R.; Pavón González, Esperanza; Alba, María D.; Física de la Materia Condensada; Junta de Andalucía; Ministerio de Ciencia Tecnología y Innovación - MINCIENCIAS, Colombia,Heavy metal contamination is a critical environmental issue, often involving complex multicomponent systems. Swelling brittle micas, a family of designer sorbents, have demonstrated exceptional heavy metal removal capabilities, yet their behabior in competitive adsorption systems remains largely unexplored. This study systematically investigates the simultaneous uptake of Pb²⁺, Cd²⁺, and Hg²⁺ on both as-synthesized brittle mica and its thiol-functionalized counterpart. Using X-ray diffraction (XRD) and nuclear magnetic resonance (NMR), we reveal critical structural transformations occurring at both short- and long-range scales during adsorption. Our f indings demonstrate that competitive adsorption governs metal uptake, leading to a reduction in total adsorption capacity compared to single-metal systems. However, selectivity toward specific metal cations remains unchanged, irrespective of competing species or surface functionalization. Overall, this study not only improves our understanding of heavy metal adsorption but also paves the way for more effective and sustainable sorbent design in environmental remediation.Artículo Boosting Hydrogen Release: Optimized C3N4-Supported Palladium Catalysts for Formic Acid Dehydrogenation(John Wiley and Sons Inc, 2025-08-05) Moreno, A.; Lobo, L.; Martínez Tejada, Leidy Marcela; Bobadilla Baladrón, Luis Francisco; Ivanova, Svetlana; Domínguez Leal, María Isabel; Centeno Gallego, Miguel Ángel; Química Inorgánica; Ministerio de Ciencia, Innovación y Universidades (MICIU). EspañaCarbon nitride, C3N4, was synthesized through thermal polycondensation of melamine with varying temperature and time conditions. This approach represents a cost-effective, straightforward, and environmentally friendly synthetic method with lower energy consumption to obtain hierarchically structured carbon nitride. The resulting materials were subjected to comprehensive characterization to analyze their crystalline structure, textural properties, composition, and light absorption characteristics. To evaluate their catalytic potential, the supports were impregnated with different loadings of palladium (1, 5, and 10 wt%) as the active phase and tested in the decomposition of formic acid for hydrogen production in liquid phase at mild conditions. This study revealed that the structure and composition of the C3N4 were highly dependent on the degree of polycondensation, which in turn was influenced by the temperature and the thermal synthesis process. The most promising catalytic performance was achieved with a support prepared by decomposing melamine at 650 °C for 4 h, followed by impregnation with 10 wt% Pd. Furthermore, a mechanistic study was conducted using operando DRIFTS-MS to explore the plausible catalytic pathways for synthesizing formic acid via CO2 hydrogenation using the aforementioned catalyst. This investigation highlights the potential of C3N4 as a support, further demonstrating its versatility in the circular economy of formic acid.