Now showing items 1-20 of 20

    • Cadmium and lead removal from aqueous solution by grape stalk wastes: modeling of a fixed-bed column 

      Miralles Esteban, Núria; Valderrama Angel, César Alberto; Casas Pons, Ignasi; Martínez Martínez, María del Rosario; Florido Pérez, Antonio (2010-09)
      Article
      Open Access
      Grape stalk wastes generated in the wine production process were used for the removal of cadmium and lead ions from aqueous solutions. The experimental breakthrough curves (BTC) were obtained from fixedbed columns. ...
    • Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH 

      Meca, S.; Martínez Torrents, Albert; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (2011)
      Article
      Open Access
      The formation of uranyl-peroxide complexes was studied at alkaline media by using UV-Visible spectrophotometry and the STAR code. Two different complexes were found at a H2O2/U(VI) ratio lower than 2. A graphical method ...
    • Dissolution experiments of commercial PWR (52 MWd/kgU) and BWR (53 MWd/kgU) spent nuclear fuel cladded segments in bicarbonate water under oxidizing conditions. Experimental determination of matrix and instant release fraction 

      Gonzalez Robles, E.; Serrano Purroy, D.; Sureda, R.; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2015-10-01)
      Article
      Open Access
      The denominated instant release fraction (IRF) is considered in performance assessment (PA) exercises to govern the dose that could arise from the repository. A conservative definition of IRF comprises the total inventory ...
    • Dynamic leaching studies of 48 MWd/kgU UO2 commercial spent nuclear fuel under oxic conditions 

      Serrano Purroy, D.; Casas Pons, Ignasi; Gonzalez Robles, E.; Glatz, Jean Paul; Wegen, D.H.; Clarens Blanco, Frederic; Giménez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; Martínez Esparza, A. (2013-03)
      Article
      Restricted access - publisher's policy
      The leaching of a high-burn-up spent nuclear fuel (48 MWd/KgU) has been studied in a carbonate-containing solution and under oxic conditions using a Continuously Stirred Tank Flow-Through Reactor (CSTR). Two samples of the ...
    • Incorporation of selenium(IV) and selenium(VI) on uranyl peroxide 

      Martínez Torrents, Albert; Giménez Izquierdo, Francisco Javier; Martínez Lledó, Xavier; Casas Pons, Ignasi; De pablo, J. (2015-01-01)
      Article
      Restricted access - publisher's policy
      © 2014, Akadémiai Kiadó, Budapest, Hungary. The sorption of Se(IV) and Se(VI) on uranium peroxide has been studied considering the sorption kinetics, the sorption isotherms and the effect of pH. Selenium sorption on studtite ...
    • Influence of the interpellet space to the Instant Release Fraction determination of a commercial UO2 Boiling Water Reactor Spent Nuclear Fuel 

      Martínez Torrents, Albert; Serrano Purroy, Daniel; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2018-02)
      Article
      Open Access
      The contact of the coolant with the fuel pin during irradiation produces a gradient of temperature in the fuel pellet that segregates the radionuclides (RN) depending on its volatility and reactivity. This segregation ...
    • Instant release fraction corrosion studies of commercial UO2 BWR spent nuclear fuel 

      Martínez Torrents, Albert; Serrano Purroy, Daniel; Sureda, R.; Casas Pons, Ignasi; Pablo Ribas, Joan de (Elsevier, 2017-05-01)
      Article
      Open Access
      The instant release fraction of a spent nuclear fuel is a matter of concern in the performance assessment of a deep geological repository since it increases the radiological risk. Corrosion studies of two different spent ...
    • Oxidation by H2O(g) in the presence of H2(g) of UO2 doped with Pd nanoparticles 

      Espriu Gascon, Alexandra; Llorca Piqué, Jordi; Domínguez Escalante, Montserrat; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (2018-09-28)
      Article
      Open Access
      This work studies the influence of epsilon particles and metallic precipitates, simulated through the deposition of Pd nanoparticles on non-irradiated UO2, on the oxidation of the spent nuclear fuel (SNF). The presence of ...
    • Preparation and characterisation of Pd nanoparticles doped UO2 samples 

      Espriu Gascon, Alexandra; Bastos Arrieta, Julio Alonso; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de (2016-01-01)
      Article
      Open Access
      To assess the safety of the deep geological disposal that would store the spent nuclear fuel (SNF), studies are centred on the SNF behaviour under repository conditions. UO2, which is the most common compound of SNF matrix, ...
    • 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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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 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
      Restricted access - publisher's policy
      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 ...
    • Strategies for surface modification with Ag-shaped nanoparticles: electrocatalytic enhancement of screen-printed electrodes for the detection of heavy metals 

      Torres Rivero Andrade, Karina Victoria Alejandra; Torralba Cadena, Lourdes; Espriu Gascon, Alexandra; Casas Pons, Ignasi; Bastos Arrieta, Julio Alonso; Florido Pérez, Antonio (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-30)
      Article
      Open Access
      Screen-printed carbon nanofiber electrodes (SPCNFEs) represent an alternative with great acceptance due to their results, as well as their low impact on the environment. In order to improve their performance, in the present ...
    • UO2 as new filling material for cesium retention in high-level nuclear waste repositories 

      Martínez Torrents, Albert; Gimenez, Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi (2015-10-01)
      Article
      Open Access
      Depleted uranium dioxide has been proposed as an inert material to fill spent nuclear fuel canisters in geological repositories. Sorption capacity of this material to retain radionuclides released from the fuel was determined. ...
    • 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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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 ...
    • Valorització de residus vegetals procedents de processos industrials com a biosorbents per a l'eliminació d'ions metàl•lics d'afluents aquosos 

      Villaescusa Gil, Isabel; Miralles Esteban, Núria; Martínez Martínez, María del Rosario; Florido Pérez, Antonio; Fiol Santaló, Núria; Casas Pons, Ignasi (Centre per a la Sostenibilitat, 2007-07-12)
      Conference report
      Open Access
      L’objectiu d’aquest projecte és la valorització de residus vegetals procedents de processos industrials, com són el pinyol d’oliva, rapa del raïm, suro, marro de cafè, etc.,com a biosorbents per a l’eliminació de diferents ...
    • VLAB3D a l'aprenentatge per la pràctica simulació virtual i interactiva en 3D d'un laboratori de química 

      Casas Pons, Ignasi; Aguilar Sanjuán, Manuel (2006-02)
      Conference report
      Open Access
      A partir de la idea inicial que teníem de millorar la simulació virtual el treball pràctic de laboratori de química dels alumnes, hem desenvolupat un programa informàtic en el que l´alumne se situa en un entorn virtual ...