Ara es mostren els items 27-39 de 39

    • Retention of cesium and strontium by uranophane, Ca(UO2)2(SiO3OH)2·5H2O 

      Espriu Gascon, Alexandra; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (2018-07-05)
      Article
      Accés obert
      This work determines the capacity of uranophane, one of the long-term uranyl secondary solid phases formed on the spent nuclear fuel (SNF), to retain radionuclides (cesium and strontium) released during the dissolution of ...
    • Secondary phase formation on UO2 in phosphate media 

      Rey, A.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Clarens, F.; De Pablo Ribes, Joan (2008-04-08)
      Article
      Accés restringit per política de l'editorial
      he dissolution of UO2 (a chemical analog of uraninite and of spent nuclear fuel) has been studied by using a flow-through reactor. The UO2 dissolution rates at total View the MathML source concentrations of 10−4, 10−5, and ...
    • Solubility study and point of zero charge of studtite (UO2O2 center dot 4H(2)O) 

      Giménez Izquierdo, Francisco Javier; De Pablo, Joan; Casas Pons, Ignasi; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel; Martinez Torrents, A (2014-10-01)
      Article
      Accés restringit per política de l'editorial
      The knowledge of the characteristics of the U(VI)-peroxide chemical system is of importance because of the relevance of the uranyl peroxide solid phases studtite (UO2O2 center dot 4H(2)O) or metastudtite (UO2O2 center dot ...
    • Sorption and mobility of Sb(V) in calcareous soils of Catalonia (NE Spain): Batch and column experiments 

      Martínez Lladó, Xavier; Valderrama Angel, César Alberto; Rovira Boixaderas, Miquel; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de (2011-01-15)
      Article
      Accés restringit per política de l'editorial
      The sorption of Sb(V) onto natural calcareous soils was studied in batch and column experiments as a function of physicochemical properties of the soil, namely: organic matter, the active fraction of Fe and Al and the pH ...
    • Sorption of antimony (V) onto synthetic goethite in carbonate medium 

      Martinez-Llado, X; Martínez Lladó, Xavier; Pablo Ribas, Joan de; Giménez Izquierdo, Francisco Javier; Ayora Ibáñez, Carlos; Martí Gregorio, Vicenç; Rovira Boixaderas, Miquel (2008-06)
      Article
      Accés restringit per política de l'editorial
      The sorption kinetics of antimony(V) on synthetic goethite is very fast compared to the sorption of other metals on goethite (e.g. arsenic and selenium) and depends on temperature, with an activation energy of 49+9 kJ . ...
    • Sorption of phosphate and zinc onto hematite and magnetite as mechanism of attenuation of contamination in agricultural soils 

      Martínez Martínez, María del Rosario; Martí, Vicens; Giménez Izquierdo, Francisco Javier (2014)
      Comunicació de congrés
      Accés obert
      Excess of natural and synthetic fertilizers applied to agricultural soils is a well-known source of contamination of nitrates and potential source of contamination of metals (copper and zinc) and phosphates (Alloway ...
    • Sorption of selenium(IV) and selenium(VI) onto natural iron oxides: Goethite and hematite 

      Rovira Boixaderas, Miquel; Giménez Izquierdo, Francisco Javier; Martínez Martínez, María del Rosario; Martí Gregorio, Vicenç; Pablo Ribas, Joan de; Martinez-Llado, X; Duro, L (Elsevier, 2008-01)
      Article
      Accés restringit per política de l'editorial
      Selenium is a toxic element with a relatively high mobility in the natural waters. Iron oxy-hydroxides might play an important role in the migration of this element as well as on its removal from contaminated water. In ...
    • Sorption of strontium on uranyl peroxide: implications for a high-level nuclear waste repository 

      Sureda Pastor, Rosa María; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel; Pablo Ribas, Joan de; Casas Pons, Ignasi; Giménez Izquierdo, Francisco Javier (Elsevier, 2010-09-15)
      Article
      Accés restringit per política de l'editorial
      Strontium-90 is considered the most important radioactive isotope in the environment and one of the most frequently occurring radionuclides in groundwaters at nuclear facilities. The uranyl peroxide studtite (UO2O2 center ...
    • Thorium sorption onto magnetite and ferrihydrate in acidic conditions 

      Rojo, I.; Seco, F.; Rovira, M.; Giménez Izquierdo, Francisco Javier; Cervantes, G.; Martí Gregorio, Vicenç; De Pablo Ribes, Joan (2009-01-01)
      Article
      Accés restringit per política de l'editorial
      Sorption of Th(IV) onto two-line ferrihydrite and magnetite in NaClO4 solutions has been studied as a function of pH and ionic strength revealing that sorption onto both solids increases with pH while it is independent on ...
    • UO2 surface oxidation by mixtures of water vapor and hydrogen as a function of temperature 

      Espriu Gascon, Alexandra; Llorca Piqué, Jordi; Domínguez Escalante, Montserrat; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2015-12-01)
      Article
      Accés obert
      In the present work, X-Ray Photoelectron Spectroscopy (XPS) was used to study the effect of water vapor on the UO2 surface as a function of temperature. The experiments were performed in situ inside a high pressure chamber ...
    • Uranium speciation in river sediments contaminated by phosphate ores 

      Meca, S.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Martí Gregorio, Vicenç; Pablo Ribas, Joan de (2012-03)
      Article
      Accés restringit per política de l'editorial
      Large amounts of phosphate ores with high concentrations of uranium were dumped by a phosphate plant into the Flix water reservoir in the Ebre River, Catalonia, NE Spain. These phosphate wastes have been mixed over the ...
    • Uranium speciation studies at alkaline pH and in the presence of hydrogen peroxide using time-resolved laser-induced fluorescence spectroscopy 

      Martínez Torrents, Albert; Meca, Sandra; Baumann, Nils; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi (2013-05)
      Article
      Accés restringit per política de l'editorial
      Time-resolved laser-induced fluorescence spectroscopy (TRLFS) was used to study the speciation of uranium(VI) at very alkaline pH (11–13), at room temperature and in the absence of CO2. In this case, at pH = 11, two different ...
    • X-ray photoelectron spectroscopy (XPS) study of surface oxidation of UO2 doped with Gd2O3 at different temperatures and atmospheres 

      García Gómez, Sonia; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Llorca Piqué, Jordi; Pablo Ribas, Joan de (2023-08)
      Article
      Accés obert
      In this work, the influence of GdIII doping on the surface oxidation of UO2 has been investigated in situ by XPS. The samples were put in contact with either hydrogen, argon or synthetic air streams saturated with water ...