Person: Astilleros García-Monge, José Manuel
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First Name
José Manuel
Last Name
Astilleros García-Monge
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Cristalografía y Mineralogía
Identifiers
6 results
Search Results
Now showing 1 - 6 of 6
Item Cinética de disolución de superficies (𝟏𝟎𝟏̅𝟒) de calcita en presencia de diferentes sales de Cu2+ disueltas en agua(Macla, 2023) Pérez Garrido, Carlos; Astilleros García-Monge, José Manuel; Fernández Díaz, María LourdesLas interacciones de polimorfos del carbonato cálcico (CaCO3), principalmente calcita y aragonito, con soluciones acuosas que contienen metales contaminantes tiene un gran interés medioambiental ya que las superficies de estas fases minerales tienen la capacidad de secuestrar de forma eficaz dichos contaminantes mediante procesos acoplados de disolución-precipitación y/o adsorción (Godelitsas et al., 2003; Prieto et al., 2003). Este estudio pretende, por un lado, valuar los cambios producidos sobre las superficies de calcita en contacto con soluciones acuosas ricas en Cu2+ de diferente concentración, y por otro, estudiar la posible influencia en esos cambios de los aniones que pueden acompañar a este catión, para lo que se han utilizado soluciones de tres sales diferentes CuCl2·2H2O, CuSO4·5H2O y Cu(NO3)2·H2O.Item Estudio mediante AFM de la influencia del Mn sobre el crecimiento de la calcita(Cuadernos do Laboratorio Xeolóxico de Laxe, 2000) Astilleros García-Monge, José Manuel; Pina Martínez, Carlos Manuel; Fernández Díaz, María Lourdes; Putnis, A.Item Formación de Estroncianita y Witherita a través del Reemplazamiento de Cristales de Calcita(Macla, 2021) Forjanes Pérez, Pablo Cayetano; Pérez Garrido, Carlos; Álvarez Lloret, Pedro; Astilleros García-Monge, José Manuel; Fernández Díaz, María LourdesItem La cristalización de (Ca,Sr)CO3 sobre superficies{1014} de calcita(Cuadernos do Laboratorio Xeolóxico de Laxe, 2000) Astilleros García-Monge, José Manuel; Pina Martínez, Carlos Manuel; Fernández Díaz, María Lourdes; Putnis, AndrewItem Precipitación de polimorfos de CaCO3 en presencia de sulfato(Macla, 2018) Cuesta Mayorga, Iris; Astilleros García-Monge, José Manuel; Fernández Díaz, María LourdesItem Precipitation of CaCO3 Polymorphs from Aqueous Solutions: The Role of pH and Sulphate Groups(Minerals, 2019) Cuesta Mayorga, Iris; Astilleros García-Monge, José Manuel; Fernández Díaz, María LourdesIn this work, we aimed to experimentally study the nucleation and growth of CaCO3 phases precipitated from supersaturated aqueous solutions in the presence of varying concentrations of sulphate oxyanion. The experiments were conducted under pH conditions close to neutral (7.6) and by considering a wide range of initial (SO42−)/(CO32−) ratios (0 to approx. 68) in the aqueous solution. We paid special attention to the evolution of the precipitates during ageing within a time framework of 14 days. The mineralogy, morphology, and composition of the precipitates were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and EDX microanalysis. The concentration of sulphate ions in the reacted aqueous solution was studied by ICPs. The experimental results showed that the mineral composition of the precipitate recovered in each run varied with the (SO42−)/(CO32−) ratio in the parental solution, which influenced the mineral evolution of the precipitates during ageing. We observed that high concentrations of sulphate in the aqueous solution stabilized the vaterite precipitates and inhibited calcite formation. Furthermore, aragonite never precipitated directly from the solution, and it was only formed via a dissolution-precipitation process in solutions with a high (SO42−)/(CO32−) ratio after long reaction times. Finally, gypsum only precipitated after long ageing in those aqueous solutions with the highest concentration of sulphate. The reaction pathways during ageing, the morphology of the calcite crystals, and the composition of vaterite and calcite were discussed considering both kinetic and thermodynamic factors. These results showed a considerably more complex behavior of the system than that observed in experiments conducted under higher pHs and supersaturation levels and lower (SO42−)/(CO32−) ratios in the aqueous phase.