http://hdl.handle.net/2117/3681 Sat, 18 May 2013 20:29:31 GMT 2013-05-18T20:29:31Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19117 Title: Some experiences related to innovation methodologies within the university classroom Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario Tue, 07 May 2013 11:07:59 GMT http://hdl.handle.net/2117/19117 2013-05-07T11:07:59Z Amante García, Beatriz; Martínez Martínez, María del Rosario no http://hdl.handle.net/2117/19115 Title: Towards methodological improvement in the Spanish studies Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario Tue, 07 May 2013 10:51:03 GMT http://hdl.handle.net/2117/19115 2013-05-07T10:51:03Z Amante García, Beatriz; Martínez Martínez, María del Rosario no http://hdl.handle.net/2117/19114 Title: A proposal to improve your evaluation skills Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario Tue, 07 May 2013 10:19:24 GMT http://hdl.handle.net/2117/19114 2013-05-07T10:19:24Z Amante García, Beatriz; Martínez Martínez, María del Rosario no http://hdl.handle.net/2117/18676 Title: Thorium sorption onto magnetite and ferrihydrate in acidic conditions Authors: Rojo, I.; Seco, F.; Rovira, M.; Giménez Izquierdo, Francisco Javier; Cervantes, G.; Martí Gregorio, Vicenç; De Pablo Ribes, Joan Abstract: 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 ionic strength. Sorption capacity of both solids is high, the maximum sorption (almost 100% of Th(IV)) occurs at pH higher than 3.5 for ferrihydrite, and higher than 3.0 for magnetite. Sorption variation with pH was modeled with three different models using the FITEQL 4.0 code: non-electrostatic model, constant capacitance model, and diffuse-double layer model. In all cases, good fit to the experimental data is obtained with one-species: a corner-sharing bidentate-mononuclear surface complex, (triple bond; length of mdashFeO)2Th2+, which coincides with the surface complex postulated on these solids surface in previous spectroscopic studies; however, the monodentate species triple bond; length of mdashFeOThOH2+ also gives a satisfactory fit. Under the experimental conditions of the present study, any effect of possible thorium colloid formation is negligible. Mon, 08 Apr 2013 09:20:06 GMT http://hdl.handle.net/2117/18676 2013-04-08T09:20:06Z Rojo, I.; Seco, F.; Rovira, M.; Giménez Izquierdo, Francisco Javier; Cervantes, G.; Martí Gregorio, Vicenç; De Pablo Ribes, Joan no 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 ionic strength. Sorption capacity of both solids is high, the maximum sorption (almost 100% of Th(IV)) occurs at pH higher than 3.5 for ferrihydrite, and higher than 3.0 for magnetite. Sorption variation with pH was modeled with three different models using the FITEQL 4.0 code: non-electrostatic model, constant capacitance model, and diffuse-double layer model. In all cases, good fit to the experimental data is obtained with one-species: a corner-sharing bidentate-mononuclear surface complex, (triple bond; length of mdashFeO)2Th2+, which coincides with the surface complex postulated on these solids surface in previous spectroscopic studies; however, the monodentate species triple bond; length of mdashFeOThOH2+ also gives a satisfactory fit. Under the experimental conditions of the present study, any effect of possible thorium colloid formation is negligible. http://hdl.handle.net/2117/18643 Title: Secondary phase formation on UO2 in phosphate media Authors: Rey, A.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Clarens, F.; De Pablo Ribes, Joan Abstract: 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 10−6 mol dm−3 have been determined to be: 1.3 × 10−10 mol m−2 s−1, 6.7 × 10−11 mol m−2 s−1, and 2.0 × 10−11 mol m−2 s−1, respectively. The dissolution rates determined are found to be higher than the ones determined for similar carbonate concentrations. Moreover, the surface of the UO2 has been studied in static tests by means of the scanning force microscopy technique (SFM) in order to follow the formation of any secondary solid phase on its surface. The formation of chernikovite (H2(UO2)2(PO4)2 · 8H2O) has been observed at a 10−4 M total View the MathML source concentration, while no uranyl-phosphate secondary phases have been found at lower View the MathML source concentrations. In experiments performed in the presence of both carbonate and phosphate, no precipitation of secondary phases has been observed. It is postulated that this is due to the formation of the highly stable uranyl-carbonate complexes in solution. Fri, 05 Apr 2013 11:20:49 GMT http://hdl.handle.net/2117/18643 2013-04-05T11:20:49Z Rey, A.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Clarens, F.; De Pablo Ribes, Joan no 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 10−6 mol dm−3 have been determined to be: 1.3 × 10−10 mol m−2 s−1, 6.7 × 10−11 mol m−2 s−1, and 2.0 × 10−11 mol m−2 s−1, respectively. The dissolution rates determined are found to be higher than the ones determined for similar carbonate concentrations. Moreover, the surface of the UO2 has been studied in static tests by means of the scanning force microscopy technique (SFM) in order to follow the formation of any secondary solid phase on its surface. The formation of chernikovite (H2(UO2)2(PO4)2 · 8H2O) has been observed at a 10−4 M total View the MathML source concentration, while no uranyl-phosphate secondary phases have been found at lower View the MathML source concentrations. In experiments performed in the presence of both carbonate and phosphate, no precipitation of secondary phases has been observed. It is postulated that this is due to the formation of the highly stable uranyl-carbonate complexes in solution. http://hdl.handle.net/2117/17583 Title: GREDIQ-RIMA: The evolution of a teaching project of experimentation in chemistry Authors: Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María del Rosario; Calvet Tarragona, Aureli; Farran Marsà, Adriana; Salán Ballesteros, Maria Núria; Álvarez del Castillo, María Dolores; Gorchs Altarriba, Roser; Almajano Pablos, María Pilar; Morillo Cazorla, Margarita; Garrido Soriano, Núria Abstract: Authors of this project belong to the Resources Chemistry Teaching Group (GReDiQ) involved in RIMA (Research and innovation in learning methodologies). The audiovisual and multimedia material productions realized have been grouped into three themes: Basic Techniques of Experimentation in Chemistry, Safety in Chemistry Laboratories and Advanced Techniques of Experimentation in Chemistry. This work has been awarded a prize of the Universitat Politècnica de Catalunya (UPC–BARCELONATECH), one of the Autonomous Region of Catalunya and another one of a State scope Tue, 05 Feb 2013 15:33:21 GMT http://hdl.handle.net/2117/17583 2013-02-05T15:33:21Z Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María del Rosario; Calvet Tarragona, Aureli; Farran Marsà, Adriana; Salán Ballesteros, Maria Núria; Álvarez del Castillo, María Dolores; Gorchs Altarriba, Roser; Almajano Pablos, María Pilar; Morillo Cazorla, Margarita; Garrido Soriano, Núria no Authors of this project belong to the Resources Chemistry Teaching Group (GReDiQ) involved in RIMA (Research and innovation in learning methodologies). The audiovisual and multimedia material productions realized have been grouped into three themes: Basic Techniques of Experimentation in Chemistry, Safety in Chemistry Laboratories and Advanced Techniques of Experimentation in Chemistry. This work has been awarded a prize of the Universitat Politècnica de Catalunya (UPC–BARCELONATECH), one of the Autonomous Region of Catalunya and another one of a State scope http://hdl.handle.net/2117/17137 Title: Binary fixed bed modeling of phenol/aniline removal from aqueous solutions onto hyper-cross-linked resin (Macronet MN200) Authors: Valderrama Angel, César Alberto; Poch Garcia, Jordi; Barios, Joan I.; Farran Marsà, Adriana; Cortina Pallás, José Luís Abstract: The sorption performance of hyper-cross-linked Macronet resin (MN200) to remove phenol and aniline from aqueous solution has been evaluated. Fixed bed column experiments were undertaken to obtain the breakthrough curves in both single and binary solutions. The film-surface diffusivity model has been used to predict the single (phenol and aniline) fixed bed breakthrough curves by using the Langmuir and Freundlich single isotherm data to represent the equilibrium. A good description of the experimental data has been obtained by both isotherms, and the mass transfer coefficient and the surface diffusivity have been obtained as optimized parameters for both solutes. The binary breakthrough curve prediction has been performed by the film surface diffusion model, incorporating an equilibrium relationship defined by the extended Langmuir isotherm model and the ideal sorbed solution theory (IAST). The sum of square errors (SSE) obtained for the IAST approach confirms the good agreement between the experimental and the predicted breakthrough data and the deviation obtained for the extended Langmuir model. The surface diffusivities in binary sorption reported a significant difference to those obtained in a single system, indicating that binary sorption is mainly controlled by the intraparticle diffusion. Mon, 17 Dec 2012 15:33:28 GMT http://hdl.handle.net/2117/17137 2012-12-17T15:33:28Z Valderrama Angel, César Alberto; Poch Garcia, Jordi; Barios, Joan I.; Farran Marsà, Adriana; Cortina Pallás, José Luís no The sorption performance of hyper-cross-linked Macronet resin (MN200) to remove phenol and aniline from aqueous solution has been evaluated. Fixed bed column experiments were undertaken to obtain the breakthrough curves in both single and binary solutions. The film-surface diffusivity model has been used to predict the single (phenol and aniline) fixed bed breakthrough curves by using the Langmuir and Freundlich single isotherm data to represent the equilibrium. A good description of the experimental data has been obtained by both isotherms, and the mass transfer coefficient and the surface diffusivity have been obtained as optimized parameters for both solutes. The binary breakthrough curve prediction has been performed by the film surface diffusion model, incorporating an equilibrium relationship defined by the extended Langmuir isotherm model and the ideal sorbed solution theory (IAST). The sum of square errors (SSE) obtained for the IAST approach confirms the good agreement between the experimental and the predicted breakthrough data and the deviation obtained for the extended Langmuir model. The surface diffusivities in binary sorption reported a significant difference to those obtained in a single system, indicating that binary sorption is mainly controlled by the intraparticle diffusion. http://hdl.handle.net/2117/16781 Title: Toxicity of metal-ethylenediaminetetraacetic acid solution as a function of chemical speciation:An approach for toxicity assessment Authors: Peraferrer, C.; Martínez Martínez, María del Rosario; Poch García, Jordi; Villaescusa Gil, Isabel Abstract: The influence of complexation by ethylenediaminetetraacetic acid (EDTA) on the toxicity of Cd(II), Cu(II), Cd(II), and Ni(II) was investigated. Result of the Microtox test, which is based on measuring the decrease of light emitted by Vibrio fischeri bacterium when exposed to a toxicant, was used as an indication of toxicity. The effect of pH and EDTA molar ratio that might potentially modify the percentage of chemical species in solution on toxicity was evaluated. In general, results indicate that toxicity decreases when increasing the pH value as well as the EDTA molar ratio. Chemical modeling was used to predict metal speciation and correlation analysis to relate chemical species with the obtained toxicity results. The species that most contribute to toxicity resulted to be MeCl? (Me = metal), which is formed as a consequence of the presence of the bioassay medium (2 % NaCl). A model that predicts metal-solution toxicity by using the chemical species, whichmost contribute to toxicity is proposed as a useful tool for toxicity assessment in waters containing metal ions and EDTA. Tue, 23 Oct 2012 10:57:52 GMT http://hdl.handle.net/2117/16781 2012-10-23T10:57:52Z Peraferrer, C.; Martínez Martínez, María del Rosario; Poch García, Jordi; Villaescusa Gil, Isabel no The influence of complexation by ethylenediaminetetraacetic acid (EDTA) on the toxicity of Cd(II), Cu(II), Cd(II), and Ni(II) was investigated. Result of the Microtox test, which is based on measuring the decrease of light emitted by Vibrio fischeri bacterium when exposed to a toxicant, was used as an indication of toxicity. The effect of pH and EDTA molar ratio that might potentially modify the percentage of chemical species in solution on toxicity was evaluated. In general, results indicate that toxicity decreases when increasing the pH value as well as the EDTA molar ratio. Chemical modeling was used to predict metal speciation and correlation analysis to relate chemical species with the obtained toxicity results. The species that most contribute to toxicity resulted to be MeCl? (Me = metal), which is formed as a consequence of the presence of the bioassay medium (2 % NaCl). A model that predicts metal-solution toxicity by using the chemical species, whichmost contribute to toxicity is proposed as a useful tool for toxicity assessment in waters containing metal ions and EDTA. http://hdl.handle.net/2117/16513 Title: Use of methyltrioctyl/decylammonium bis 2,4,4-(trimethylpentyl)phosphinate ionic liquid (ALiCY IL) on the boron extraction in chloride media Authors: Fortuny Sanromá, Agustín; Coll Ausió, Mª Teresa; Sastre Requena, Ana María Abstract: Recent restriction of boron concentration in drinking water has produced some problems in the seawater desalinization plants because the rejection of boron in most of the plants is inadequate. Three ionic liquids derived from Cyanex 272 as an anion with different cations (from Aliquat 336, Cyphos IL 101 and Cyphos IL 167) were prepared to be used as boron extractants. Liquid–liquid extraction experiments were carried out to evaluate the viability of boron separation from high chloride media. The effect of ILs and boron concentration and pH were determined. Successive extractions, maintaining the organic phase, provided satisfactory results in order to implement these ILs on supported liquid membrane technologies. The use of the ionic liquid as a carrier can overcome the inconvenience associated with the membrane stability. In this sense, the ionic liquids ALiCY and the mixture of Cyphos IL 101 and Cyphos IL 167 with Cyanex 272 have been tested as liquid carrier for boron separation by using a flat sheet supported liquid membrane. The results obtained allow us to think about the application of this kind of ILs on the process intensification to remove boron from chloride solutions. Tue, 18 Sep 2012 06:45:11 GMT http://hdl.handle.net/2117/16513 2012-09-18T06:45:11Z Fortuny Sanromá, Agustín; Coll Ausió, Mª Teresa; Sastre Requena, Ana María no Boron removal, ionic liquids, quatemary ammonium salt, clhoride media, supported liquid membrane Recent restriction of boron concentration in drinking water has produced some problems in the seawater desalinization plants because the rejection of boron in most of the plants is inadequate. Three ionic liquids derived from Cyanex 272 as an anion with different cations (from Aliquat 336, Cyphos IL 101 and Cyphos IL 167) were prepared to be used as boron extractants. Liquid–liquid extraction experiments were carried out to evaluate the viability of boron separation from high chloride media. The effect of ILs and boron concentration and pH were determined. Successive extractions, maintaining the organic phase, provided satisfactory results in order to implement these ILs on supported liquid membrane technologies. The use of the ionic liquid as a carrier can overcome the inconvenience associated with the membrane stability. In this sense, the ionic liquids ALiCY and the mixture of Cyphos IL 101 and Cyphos IL 167 with Cyanex 272 have been tested as liquid carrier for boron separation by using a flat sheet supported liquid membrane. The results obtained allow us to think about the application of this kind of ILs on the process intensification to remove boron from chloride solutions. http://hdl.handle.net/2117/16506 Title: Review of the dielectric properties of nanofiltration membranes and verification of the single oriented layer approximation Authors: Oatley, Darren Lee; Llenas Argelaguet, Laia; Pérez Magrané, Ramon; Williams, Paul M.; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel Abstract: The structuring of water at soft solid surfaces remains an area of great interest to colloid science as a whole and has many applications in relation to colloid stability, foams, and wetting films as well as being central to membrane separations. Quantitatively calculating the structural components of thin layers of water and the interaction forces of hydrated molecules with the surface of pores through a layer of water having modified structure is one of the most important challenges in the physics of surface phenomenon. In this paper these effects are reviewed and discussed in relation to the confines of a capillary pore. Membrane nanofiltration is extremely complex and is dependent on the micro-hydrodynamics and interfacial events occurring at the membrane surface and within the membrane nanopores. There is significant debate as to the exact nature of these complex phenomena and rejection is typically attributed to a combination of steric and electrical effects. The electrical effects are less well understood and in particular the contribution of dielectric exclusion. A review of the two competing descriptions of dielectric exclusion is presented along with the theories currently used in modelling this phenomena. A series of rejection experiments of 0.01 M salt solutions at the membrane isoelectric point has been performed for the NF270 and NF99HF membranes. The dielectric constants inside the nanopore are calculated and these values were consistent for three of the salts studied, indicating that a simplistic model based on Born theory is accurate enough for engineering calculations and that ion solvation is most likely to be the more appropriate dielectric exclusion mechanism for true nanofiltration membranes. Mon, 17 Sep 2012 10:50:03 GMT http://hdl.handle.net/2117/16506 2012-09-17T10:50:03Z Oatley, Darren Lee; Llenas Argelaguet, Laia; Pérez Magrané, Ramon; Williams, Paul M.; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel no Nanofiltration, Dielectric exclusion, Ion solvation, Modelling The structuring of water at soft solid surfaces remains an area of great interest to colloid science as a whole and has many applications in relation to colloid stability, foams, and wetting films as well as being central to membrane separations. Quantitatively calculating the structural components of thin layers of water and the interaction forces of hydrated molecules with the surface of pores through a layer of water having modified structure is one of the most important challenges in the physics of surface phenomenon. In this paper these effects are reviewed and discussed in relation to the confines of a capillary pore. Membrane nanofiltration is extremely complex and is dependent on the micro-hydrodynamics and interfacial events occurring at the membrane surface and within the membrane nanopores. There is significant debate as to the exact nature of these complex phenomena and rejection is typically attributed to a combination of steric and electrical effects. The electrical effects are less well understood and in particular the contribution of dielectric exclusion. A review of the two competing descriptions of dielectric exclusion is presented along with the theories currently used in modelling this phenomena. A series of rejection experiments of 0.01 M salt solutions at the membrane isoelectric point has been performed for the NF270 and NF99HF membranes. The dielectric constants inside the nanopore are calculated and these values were consistent for three of the salts studied, indicating that a simplistic model based on Born theory is accurate enough for engineering calculations and that ion solvation is most likely to be the more appropriate dielectric exclusion mechanism for true nanofiltration membranes. http://hdl.handle.net/2117/16488 Title: Uranium speciation in river sediments contaminated by phosphate ores Authors: Meca, S.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Martí Gregorio, Vicenç; Pablo Ribas, Joan de Abstract: 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 years with effluents from other industries as well as with the sediments of the river, resulting in a complex mixture of solid wastes and sediments. No investigations on uranium speciation in such sediments were made because of the complexity of the sediments composition as well as the relatively low uranium content. However, these studies are necessary in order to predict the release of the uranium to the river waters. Here, we studied uranium speciation in sediments from two sampling points of the Flix water reservoir and at depths from 5 to 113 cm. We used room temperature time-resolved laser fluorescence spectroscopy and a three-step sequential extraction procedure described by the Standards, Measurements, and Testing Programme of the European Union. We found that uranium was mainly present in the sediment samples as meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low solubility will result in a low release of uranium to the river waters. In addition, we found that some uranium was linked to sediments by forming surface complexes. We therefore made the first study of uranium speciation in the sediments of the Flix water reservoir. Fri, 14 Sep 2012 09:44:07 GMT http://hdl.handle.net/2117/16488 2012-09-14T09:44:07Z Meca, S.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Martí Gregorio, Vicenç; Pablo Ribas, Joan de no Autunite, Flix reservoir, Sediments, Sequential extraction, TRLFS, Uranium 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 years with effluents from other industries as well as with the sediments of the river, resulting in a complex mixture of solid wastes and sediments. No investigations on uranium speciation in such sediments were made because of the complexity of the sediments composition as well as the relatively low uranium content. However, these studies are necessary in order to predict the release of the uranium to the river waters. Here, we studied uranium speciation in sediments from two sampling points of the Flix water reservoir and at depths from 5 to 113 cm. We used room temperature time-resolved laser fluorescence spectroscopy and a three-step sequential extraction procedure described by the Standards, Measurements, and Testing Programme of the European Union. We found that uranium was mainly present in the sediment samples as meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low solubility will result in a low release of uranium to the river waters. In addition, we found that some uranium was linked to sediments by forming surface complexes. We therefore made the first study of uranium speciation in the sediments of the Flix water reservoir. http://hdl.handle.net/2117/16140 Title: Determination of penetration and fixation curves of leather using humic derivatives Authors: Bacardit Dalmases, Anna; Shendrik, Alexander; Morera Prat, Josep Maria; Bou Serra, Jordi; Ollé Otero, Lluís Abstract: This study examines the behavior of three different types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their penetration and fixation to the leather. More specifically, through the tests carried out the curves of penetration and fixation were drawn, and from these the optimum pH intervals of penetration and fixation to the leather were determined. The data obtained is essential in view of the subsequent application of humic acids as tanning agents and/or retanning agents Tue, 26 Jun 2012 14:27:04 GMT http://hdl.handle.net/2117/16140 2012-06-26T14:27:04Z Bacardit Dalmases, Anna; Shendrik, Alexander; Morera Prat, Josep Maria; Bou Serra, Jordi; Ollé Otero, Lluís no This study examines the behavior of three different types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their penetration and fixation to the leather. More specifically, through the tests carried out the curves of penetration and fixation were drawn, and from these the optimum pH intervals of penetration and fixation to the leather were determined. The data obtained is essential in view of the subsequent application of humic acids as tanning agents and/or retanning agents http://hdl.handle.net/2117/15953 Title: Potentiometric electronic tongue-flow injection analysis system for the monitoring of heavy metal biosorption processes Authors: Wilson Masso, Deivy; del Valle, M.; Alegret, Salvador; Valderrama Angel, César Alberto; Florido Pérez, Antonio Abstract: An automated flow injection potentiometric (FIP) system with electronic tongue detection (ET) is used for the monitoring of biosorption processes of heavy metals on vegetable wastes. Grape stalk wastes are used as biosorbent to remove Cu2+ ions in a fixed-bed column configuration. The ET is formed by a 5-sensor array with Cu2+ and Ca2+-selective electrodes and electrodes with generic response to heavy-metals, plus an artificial neural network response model of the sensor's cross-response. The real-time monitoring of both the Cu2+ and the cation exchanged and released (Ca2+) in the effluent solution is performed by using flow-injection potentiometric electronic tongue system. The coupling of the electronic tongue with automation features of the flow-injection system allows us to accurately characterize the Cu2+ ion-biosorption process, through obtaining its breakthrough curves, and the profile of the Ca2+ ion release. In parallel, fractions of the extract solution are analysed by spectroscopic techniques in order to validate the results obtained with the reported methodology. The sorption performance of grape stalks is also evaluated by means of well-established sorption models. Thu, 31 May 2012 11:03:03 GMT http://hdl.handle.net/2117/15953 2012-05-31T11:03:03Z Wilson Masso, Deivy; del Valle, M.; Alegret, Salvador; Valderrama Angel, César Alberto; Florido Pérez, Antonio no Grape stalk wastes, Copper sorption, Ion-selective electrodes, Flow-injection potentiometry, Electronic tongue, On-line monitoring An automated flow injection potentiometric (FIP) system with electronic tongue detection (ET) is used for the monitoring of biosorption processes of heavy metals on vegetable wastes. Grape stalk wastes are used as biosorbent to remove Cu2+ ions in a fixed-bed column configuration. The ET is formed by a 5-sensor array with Cu2+ and Ca2+-selective electrodes and electrodes with generic response to heavy-metals, plus an artificial neural network response model of the sensor's cross-response. The real-time monitoring of both the Cu2+ and the cation exchanged and released (Ca2+) in the effluent solution is performed by using flow-injection potentiometric electronic tongue system. The coupling of the electronic tongue with automation features of the flow-injection system allows us to accurately characterize the Cu2+ ion-biosorption process, through obtaining its breakthrough curves, and the profile of the Ca2+ ion release. In parallel, fractions of the extract solution are analysed by spectroscopic techniques in order to validate the results obtained with the reported methodology. The sorption performance of grape stalks is also evaluated by means of well-established sorption models. http://hdl.handle.net/2117/15784 Title: Biogenic hydroxypatite (Apatite II TM) dissolution kinetics and metal removal from acid mine drainage Authors: Oliva Moncunill, Josep; Cama, Jordi; Cortina Pallás, José Luís; Ayora Ibáñez, Carlos; Pablo Ribas, Joan de Mon, 07 May 2012 10:39:57 GMT http://hdl.handle.net/2117/15784 2012-05-07T10:39:57Z Oliva Moncunill, Josep; Cama, Jordi; Cortina Pallás, José Luís; Ayora Ibáñez, Carlos; Pablo Ribas, Joan de no AMD, Apatite, Dissolution kinetics, Metal precipitation, PRB http://hdl.handle.net/2117/15766 Title: Humic acid derivatives as tanning and retanning agents Authors: Bacardit Dalmases, Anna; Morera Prat, Josep Maria; Shendrik, Alexander; Jorge Sánchez, Juan; Ollé Otero, Lluís Abstract: This study examines the behaviour of three types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their capacity to be used as tans and retans. The study makes use of conditions set out in a previous study (See Determination of penetration and fixation curves of leather using humic derivatives). Additionally, subsequent complementary tests were carried out using other retans that are commonly used in the tanning industry in order to compare and improve on the physical properties assessed here Thu, 26 Apr 2012 15:16:08 GMT http://hdl.handle.net/2117/15766 2012-04-26T15:16:08Z Bacardit Dalmases, Anna; Morera Prat, Josep Maria; Shendrik, Alexander; Jorge Sánchez, Juan; Ollé Otero, Lluís no This study examines the behaviour of three types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their capacity to be used as tans and retans. The study makes use of conditions set out in a previous study (See Determination of penetration and fixation curves of leather using humic derivatives). Additionally, subsequent complementary tests were carried out using other retans that are commonly used in the tanning industry in order to compare and improve on the physical properties assessed here