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- PublicaciónEquilibrium conditions for the construction of the Pourbaix diagrams for iron-chromium alloys in lithium bromide absorption machines [Dataset](2024-09-23) Muñoz Portero, María José; Nachiondo Farinós, Teresa del Montecarmelo; García Antón, José; Dpto. de Ingeniería Química y Nuclear; Dpto. de Informática de Sistemas y Computadores; Escuela Técnica Superior de Ingeniería Industrial; Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental; Escuela Técnica Superior de Ingeniería Informática; Grupo de Arquitecturas ParalelasThe dataset contains the data that have been obtained during the calculation of the equilibrium conditions used for the construction of the Pourbaix diagrams for iron-chromium alloys in the absence of and in the presence of lithium bromide (LiBr)/water (H2O) solutions with high concentrations (400-992 g/L) to simulate the aggressive conditions in the LiBr absorption machines. Equilibrium conditions for electrochemical and chemical reactions are calculated. The activity values of aqueous species considered are 10^–6, 10^–4, 10^–2 and 10^0. The bromide ion activities are 15.61, 194.77, 650.06 and 2042.65 and the water activities are 0.715, 0.358, 0.216 and 0.118, corresponding respectively to LiBr/H2O concentrations of 400, 700, 850 and 992 g/L at 25 ºC.
- PublicaciónCharacterization of Nanostructures containing WO3, MoO3, TiO2 and ZnO Photoelectrocatalytic Degradation of the Pesticide Imazalil(Universitat Politecnica de Valencia, 2024-09-06) García Antón, José; Cifre Herrando, Mireia; Roselló Márquez, Gemma; Navarro-Gázquez, Pedro; Muñoz-Portero, María José; Blasco Tamarit, María Encarnación; Dpto. de Ingeniería Química y Nuclear; Escuela Técnica Superior de Ingeniería Industrial; Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental; Generalitat Valenciana; Agencia Estatal de InvestigaciónThe dataset contains the data that have been used to synthesize and characterize different types of nanostructures (WO3, WO3-Mo, TiO2, and TiO2-ZnO) for a comparison of hybrid and pure nanostructures to use them as a photoanodes for photoelectrocatalytic degradation of emerging contaminants. A structural and compositional characterization was performed using Raman confocal laser spectroscopy and X-Ray Diffraction (XRD). Photoelectrochemical characterization of nanostructures was performed by Photoelectrochemical Impedance Spectroscopy (PEIS), Mott-Schottky (M-S), and Water Splitting (WS) tests. Finally, the photoelectrocatalytic degradation of the pesticide Imazalil was carried out with the best optimized nanostructure (TiO2-ZnO).
- PublicaciónThe Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants(Universitat Politècnica de València, 2022-08-26) López Rodríguez, Daniel; Micó Vicent, Bárbara; Bonet Aracil, María Angeles; Cases Iborra, Francisco Javier; Bou Belda, Eva; Dpto. de Ingeniería Textil y Papelera; Dpto. de Matemática Aplicada; Dpto. de Ingeniería Gráfica; Centro de Investigación en Tecnologías Gráficas; Escuela Politécnica Superior de Alcoy; Grupo de Electrocatálisis, Síntesis Electroquímica y Caracterización de Polímeros; Grupo de Investigación Gestión Integral en la Industria TextilConcerns about the health of the planet have grown dramatically, and the dyeing sector of the textile industry is one of the most polluting of all industries. Nanoclays can clean dyeing wastewater using their adsorption capacities. In this study, as a new finding, it was possible to analyze and quantify the amount of metal ions substituted by anionic dyes when adsorbed, and to determine the optimal amount of nanoclay to be used to adsorb all the dye. The tests demonstrated the specific amount of nanoclay that must be used and how to optimize the subsequent processes of separation and processing of the nanoclay. Hydrotalcite was used as the adsorbent material. Direct dyes were used in this research. X-ray diffraction (XRD) patterns allowed the shape recovery of the hydrotalcite to be checked and confirmed the adsorption of the dyes. An FTIR analysis was used to check the presence of characteristic groups of the dyes in the resulting hybrids. The thermo-gravimetric (TGA) tests corroborated the dye adsorption and the thermal fastness improvement. Total solar reflectance (TSR) showed increased radiation protection for UV-VIS-NIR. Through the work carried out, it has been possible to establish the maximum adsorption point of hydrotalcite.
- PublicaciónSynthesis and Characterisation of TiO2/ZnO2 hybrid nanostructures formed by electrodeposition with different Zn(NO3)2 concentrations and used in photoelectrochemical applications [Dataset](Universitat Politècnica de València, 2024-07-26) García Antón, José; Navarro-Gázquez, Pedro José; Blasco Tamarit, María Encarnación; Muñoz Portero, María José; Solsona-Espriu, Benjamín; Fernández-Domene, Ramón Manuel; Sánchez Tovar, Rita; Dpto. de Ingeniería Química y Nuclear; Escuela Técnica Superior de Ingeniería Industrial; Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental; Ministerio de Ciencia e Innovación; Generalitat Valenciana; Ministerio de Economía, Industria y CompetitividadThe dataset contains the data that have been obtained during the synthesis and the characterization (structural, compositional, and electrochemical) of TiO2/ZnO2 hybrid nanostructures used in photoelectrochemical applications. TiO2/ZnO hybrid nanostructures were synthetized by electrochemical anodization of titanium to form TiO2 nanosponges with crystalline structure and subsequently ZnO electrodeposition. Different Zn(NO3)2 concentrations were used for electrodeposition (10–60 mM). A structural and compositional characterisation was performed using X-Ray Diffraction (XRD). Electrochemical characterisation of nanostructures was performed by Photoelectrochemical Water Splitting (PWS), stability to photocorrosion, Electrochemical Impedance Spectroscopy (EIS), and Mott-Schottky tests.
- PublicaciónElectrochemical degradation of Naproxen by carbon paper electrodes coated by RGO and Pt(Universitat Politècnica de València, 2024-06-18) Molina Puerto, Javier; Olcina Doménech, Laura; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier; Dpto. de Ingeniería Textil y Papelera; Escuela Politécnica Superior de Alcoy; Grupo de Electrocatálisis, Síntesis Electroquímica y Caracterización de Polímeros; Agencia Estatal de Investigación; European CommissionThis research study investigates the electrooxidation of naproxen (NPX), an anti-inflammatory pharmaceutical, on modified carbon paper (CP) electrodes. Electrochemical modification of CP electrodes was accomplished with Pt or reduced graphene oxide (RGO)-Pt coatings, resulting in the production of electroactive electrodes. RGO coatings synthesized by cyclic voltammetry (CV) for 10 scans provided the optimal coverage for the CP electrode surface. The deposition of Pt nanoparticles (Pt NPs) on the electrodes (CP or CP-RGO) by CV produced a good electrode surface coverage with 20 synthesis scans. The voltammetric analysis of the electrodes in 230 mg/L NPX solution showed oxidation peaks around 1.0 to 1.2 V. Moreover, the inclusion of RGO in the coating led to an increase in the current density of these oxidation peaks and a decrease of the electrode electron transfer resistance as measured by electrochemical impedance spectroscopy. The electrolysis of NPX in different electrolytes (Na2SO4 and Na2SO4/NaCl) was conducted at 1.4 V, and the removal of NPX was analyzed using high-performance liquid chromatography. The CP-RGO-Pt electrode in Na2SO4/NaCl media showed the fastest NPX degradation kinetics, resulting in a 90 % degradation in only 90 min with low charge consumption (0.07 A⋅h⋅L-1). The smaller size of Pt NPs deposited on CP-RGO, as observed by field emission scanning electron microscopy and transmission electron microscopy, contributed to the higher electrochemical response in CV and a faster kinetic degradation of NPX.