Modified diatomites for Fenton-like oxidation of phenol

Raw diatomites were modified by acid or base treatments; addition of Fe or Cu species through the incipient wet impregnation method (IWI) and calcination at 700 °C. Samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM-EDX), Mossbauer spectroscopy, point of zero charge (PZC), pyridine temperature programme desorption (TPD), themogravimetric analysis (TGA) and BET surface area determination. According to characterization results, four samples were selected: simply calcined Diatom (D), iron added (Fe-D), acid treated Fe reimpregnated (H-Fe-D) and copper added (Cu/Fe-D). Materials were tested as catalysts for the peroxidation of phenol solutions (1000 mg/L) in a batch laboratory reactor, at different operating conditions in 5 h tests. D, Fe-D and H-Fe-D samples allowed complete phenol removal under all the operating range studied. At optimum conditions, TOC conversions of 50–55% were obtained. Metal ions added through the IWI procedure resulted more labile than metal present originally. The acidic treatment favored the initiation of the reaction showing a reduction of the induction period at almost neutral initial pH. The Fe-D catalyst exhibited poor performance, lower reactions rates and higher Fe leaching. Conversely, high TOC conversions (80%) were achieved with Cu/Fe-D, however, Cu leaching was excessive (12.7%). D and H-Fe-D samples were used in consecutive runs (up to 20 h) maintaining phenol conversion and TOC reduction. Overall, a good performance was obtained, even comparable to more sophisticated Fe catalysts.Fil: Inchaurrondo, Natalia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Ramos, Cinthia Paula. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zerjav, G.. National Institute Of Chemistry; EsloveniaFil: Font, J.. Universitat Rovira I Virgili; EspañaFil: Pintar, A.. National Institute Of Chemistry; EsloveniaFil: Haure, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentin

'You are responsible for your own life, your grades, your everything': an exploration of the transition and wellbeing experience of IB DP students

This mixed-methods study explored the Wellbeing Experience of International Baccalaureate (IB) Diploma Programme (DP) Students and their Transition into the DP. The study aimed to understand the effect that the transition into the DP would have for students who were already within the IB programmes and for those who were transitioning from non-IB schools. During the first phase, quantitative data was collected through Reddit and two European IB Schools from 154 current IB DP students using the Heubner 41 item Multidimensional Student’s Life Satisfaction Scale (MSLSS) (Huebner E. , 2001) as a measure of their wellbeing. Two additional qualitative questions were included in the survey which asked participants to identify their biggest source of stress and how they coped with this stress. During the second phase four individual interviews were conducted as well as one focus group of eight participants. The qualitative data was gathered through one of the European IB Schools to provide more insight into the factors which may be impacting IB DP students’ wellbeing and provide a more holistic view of their wellbeing. Quantitative data analysis was conducted to see whether factors, such as age, gender, grade, and students’ transition from a non-IB school, influenced their wellbeing. The qualitative data was analysed using thematic analysis (Braun & Clarke, 2006). The findings show that wellbeing is impacted by multiple factors, including transition, grade, and age. These findings were echoed in half of the individual interviews and throughout the group discussion which occurred within in the focus group. Themes concerning the responsibility which DP students take on emerged throughout the qualitative measures as well as the shared theme of overwhelming academic workload. However, the individual interviews also revealed that some participants did not feel negatively impacted by the DP and that they were able to thrive and flourish within the IB environment. Finally, analysis of the two qualitative survey questions revealed that IB DP students’ main sources of stress were their academic workload, in particular their examinations, and their marks. Most participants responded that they did not cope well with their stress and that they did not turn to others for help. Whilst this research focuses on the experiences of IB DP students this research contributes to our knowledge of how high school students’ wellbeing may be negatively impacted during school transitions, whether this be in changing schools or moving from one school stage to the next. Furthermore, when faced with increased academic stress and pressure high school students’ wellbeing is negatively impacted. Finally, these factors also have a demonstrable impact on how students engage with and access self-care and support within schools

Orange II removal by a horseradish peroxidase immobilized onto chemically modified diatomites is a combination of adsorption and oxidation processes

In this work, a horseradish peroxidase (HRP) was immobilized onto diatomites by covalent bonding. Results indicated that the enzyme loading increased when diatomites were modified with (3-Aminopropyl) triethoxysilane (APTES) and glutaraldehyde. The immobilization was confirmed by SEM/EDX, XRD, DRIFT, and TGA analysis. Higher HRP concentrations of the immobilization solution and immobilization time had also a positive effect on the enzyme loading. Orange II (OII) adsorption onto diatomites and oxidative catalytic activity was evaluated. Results demonstrated that diatomites had a low OII adsorption capacity. However, under the presence of hydrogen peroxide, the dye removal was highly increased due to the catalytic activity of the immobilized HRP. A mathematical model that adequately describes the simultaneous adsorption and enzymatic oxidation of OII in batch tests was developed. Finally, immobilized diatomites were tested in the decolourization reaction of Orange II in a fixed-bed column reactor. Column results demonstrated that the immobilized HRP remained active for at least 12 h during three sequential OII removal tests.Fil: Morales Urrea, Diego Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; ArgentinaFil: Haure, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; ArgentinaFil: Contreras, Edgardo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentin

Comparison of Identification Methods of a Time-varying Insulin Sensitivity Parameter in a Simulation Model of Glucose Metabolism in the Critically Ill

6-pages (invited)Models of glucose metabolism can help to simulate and predict the blood glucose response in hyperglycaemic, critically ill patients. Model prediction performance depends on a su ciently accurate estimation of the patient's time-varying insulin sensitivity. The work presents three least squares approaches, the integral method and a Bayesian method that have been compared by prediction accuracy on an absolute and on a relative scale. Clinical data yields 1491 blood glucose predictions based on 10 critically ill patients were processed. The Bayesian approach proved to be best with small errors (9:7% absolute percent error, 14:7 root mean square of logarithmic error for prediction times 2h), and fewer and smaller outliers compared to the other methods. Computationally, the Bayesian method took 1.5 times longer per prediction compared to the fastest method. It can be concluded that a Bayesian parameter estimation gives safe and e ective results for the insulin sensitivity estimation for this model

Prediction Validation of Two Glycaemic Control Models in Critical Care

Invited paperMetabolic models can substantially improve control of hyperglycaemia in critically ill patients. Control efficacy depends on how accurately a model-based system is able to predict future blood glucose (BG) concentrations after a glycaemic control intervention. This research compares two metabolic models in terms of their predictive power. 30 minutes to 10 hour forward predictions are made using the Glucosafe model (GS) and a clinically tested model (CC) from Christchurch in a retrospective study of 11 hyperglycemic patients, 6 from New Zealand and 5 from Denmark. Median and ranges of prediction errors are similar for predictions up to 360 minutes. Both models make better predictions on the Danish patients. At long prediction times of more than 5 hours, GS predictions tend to be more accurate in the cohort from New Zealand whereas the CC model tends to predict better in the cohort from Denmark. However, differences in root mean square (RMS) of prediction errors are not greater than 4–5% in both cohorts. For both models, outlying prediction errors are dominated by single patients, particularly type 1 diabetic patients. GS predicted BG values are generally higher compared to CC predicted values. As expected, the RMS prediction error increases with prediction interval for both models and cohorts. Results show the potential of both models for use in prospective clinical trials with longer than 120 min sampling intervals, though predictive power is probably related to the type of cohort in terms of admission type, degree of illness and glycaemic stability

¿La "cuestión" mapuche? : Narrativas en torno a la disputa por el territorio en Puelmapu

En la presente investigación indagamos acerca de las representaciones sociales que circulan en los diarios Página/12, La Nación, El Chubut y el Diario Río Negro en torno a la nación mapuche en dos conflictos específicos por el territorio: la recuperación ancestral efectiva de tierras apropiadas por la Compañía Benetton por parte de la comunidad Curiñanco-Rúa Nahuelquir (Santa Rosa Leleque, Chubut, 2002-2015) y la resistencia de las comunidades Kaxipayiñ y Campo Maripe asentadas en zonas petroleras (Loma La Lata, Neuquén, 2012-2015). A lo largo de este trabajo, nos propusimos rastrear las marcas del discurso racista que aparecen en el tratamiento periodístico de estos conflictos y partimos de problematizar cómo es que se cristaliza dicho relato. A su vez, también nos preguntamos cómo es que persisten discursos y prejuicios racistas en la Argentina contemporánea y si es posible pensar continuidades, rupturas, tensiones, transformaciones en la (re)producción de dichas narrativas. En este sentido, nos resultó indispensable diagramar una triangulación metodológica para dar cuenta de la complejidad de la problemática. Así, recurrimos a la perspectiva del análisis discursivo que nos permitió identificar y analizar las representaciones sociales, examinar las estrategias discursivas más significativas utilizadas por los distintos diarios y reconstruir los posibles efectos de sentido. Por otro lado, incluimos el método etnográfico como elemento de acercamiento a las comunidades y para el desarrollo de nuestro trabajo de campo. También nos fueron útiles aspectos de la entrevista periodística que facilitaron la reconstrucción contextual con personalidades y especialistas en la materia. Por último, ante la pregunta ¿por qué (re)pensar a los pueblos originarios hoy?, creemos que su reflexión, en el marco del escenario social y político contemporáneo de la Argentina y América Latina, implica revalorizar a un actor social que ha sido negado e invisibilizado desde la conquista de América y posteriormente, con la conformación del Estado-Nación argentino. Entendemos que conlleva también a asumir la complejidad de poner en diálogo distintas cosmovisiones, distintas formas de entender al mundo y otro tipo de vínculo con la naturaleza. Hoy, a 200 años de la conformación de los Estados-Naciones latinoamericanos, los pueblos originarios han cobrado visibilidad como actores políticos a través de las luchas que han llevado adelante por la recuperación y la defensa de su territorio; poniendo en tensión el actual modelo de desarrollo donde los bienes de la naturaleza constituyen una mercancía más. Vemos, a su vez, que la falsa dicotomía existente entre “cultura hegemónica occidental” y “cultura originaria” ha funcionado como una limitante para poder reflexionar sobre el fenómeno social de los pueblos originarios en su complejidad ya que por un lado, la ciencia, tradicionalmente, ha construido una mirada en torno a los indígenas que los ha descontextualizado, segmentado, aislado; les ha negado una historia viva. Y por otro, los ha mirado paternalmente, como carentes, como incapaces de ser sujetos políticos con voz propia. Asumimos además, que aún persisten en los sentidos circulantes en torno a los pueblos indígenas una carga valorativa negativa, una mirada que los asocia al atraso e incluso, la idea del “otro” como una amenaza; siendo conscientes de que algunos de estos discursos están atravesados por la herencia que nos ha dejado la colonia. De ahí que, pensar la colonización es (re)pensar el lenguaje, los discursos, los sentidos. Es (re)pensar la identidad latinoamericana y nacional incorporando los elementos culturales que han sido excluidos de los parámetros de entendimiento. En este sentido, entendemos que el propósito de nuestra investigación es profundamente político.Facultad de Periodismo y Comunicación Socia

Prussian blue onto activated carbon as a catalyst for heterogeneous fenton-like processes.

The main goal of this contribution is the development of a new heterogeneous Fenton-like oxidation system based on Prussian Blue supported over a commercially available granular activated carbon (GAC). The catalysts were prepared following basically three different approaches: (i) Prussian Blue (Fe3[Fe(CN)6]2) particles adsorbed onto the GAC by impregnation, (ii) Prussian Blue nanoparticles (PBNP) prepared ex-situ and adsorbed onto the GAC; and (iii) PBNP prepared in-situ onto the GAC. The catalysts were characterized by SEM, EDS, BET surface area and Fe content. Their performance in the catalytic wet peroxide oxidation of a model azo dye, Orange G, was tested in a batch lab-scale stirred reactor. Activity and stability runs were carried out and analyzed in terms of dye discoloration, Total Organic Carbon removal, UV-vis spectra and degree of iron leaching.Fil: Doumic, Lucila Inés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación En Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingenieria; ArgentinaFil: Salierno, Gabriel Leonardo. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Cassanello, Miryan C.. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Haure, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación En Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingenieria; ArgentinaFil: Ayude, María Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación En Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingenieria; Argentin

On disclosing the role of mesoporous alumina in the ozonation of sulfamethoxazole: Adsorption vs. Catalysis

Ordered mesoporous alumina (MA) and Fe-doped MA were synthesized by evaporation-induced self-assembly and tested for the ozonation of sulfamethoxazole (SMX). The synthesis methodology produced MA whose surface and structural properties exceeded those of commercial types displaying a BET surface area of 263 m2/g, a pore volume of 0.8 cm3/g and aligned cylindrical pores of c.a. 10 nm. The ozonation of SMX (20 mg/L) was performed in a semibatch stirred tank reactor at: T = 22 °C, [O3]gas = 10 mg/L, Qgas = 42 L/h NTP, [solid] ≈ 1 g/L, t = 120 min. Single ozonation achieved fast and complete SMX removal and mineralized up to 35% of the organics at neutral pH. The addition of MA or Fe-doped MA did not affect the removal rate of SMX, but did achieve a remarkable TOC removal up to 86% at acid pH. However, under the selected operating conditions, ferric species did not improve the removal of organic matter. Then, the adsorption and catalytic contribution of MA was evaluated in specifically-designed experiments. While SMX adsorption was low, its oxidation intermediates did adsorb onto MA surface. Despite the high ability of the materials to decompose ozone, the results revealed that the by-products adsorption is the prevailing process for the TOC removal. After four successive reuses, MA reduced its adsorption performance due to chemisorption of carboxylates. Nevertheless, the worn material was regenerated by direct ozonation in gas phase. In addition, primary transformation products were identified by LC–ESI–TOF–MS and the scavenging effect of the water matrix was assessed using bottled water and a real secondary wastewater.Fil: Di Luca, Carla. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; ArgentinaFil: Inchaurrondo, Natalia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; ArgentinaFil: Marcé, Mireia. Universidad Central de Barcelona; EspañaFil: Parra, Rodrigo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Esplugas, Santiago. Universidad Central de Barcelona; EspañaFil: Haure, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química; Argentin

Estudio de recepción de la psicología francesa en Córdoba: la tesis de medicina de M. Pattin, "Valor Semiológico de las alteraciones del carácter" (1917)

Fil: Fruttero, José Agustín. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Fil: Torres, Amparo. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Fil: Haure, Lucia. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Analizamos la tesis de medicina de Mauricio Pattin, titulada: “Valor semiológico de las alteraciones del carácter” (1917). El autor se ve influenciado por la psiquiatría y la psicología francesa y se apoya principalmente en el área clínica. Nuestro trabajo compara los conceptos de Carácter, emoción y pasión, como categorías de la psicología francesa, en la tesis y en los textos originales que han sido adaptados activamente. En este caso el estudio de la obra de Pattin, nos permite realizar un pequeño aporte a la historia de la psicología en Córdoba y Argentina. Nuestro problema principal reside en establecer los procesos materiales e intelectuales involucrados en la recepción de conocimientos “psi” de Francia hacia Argentina en la ya mencionada tesis de medicina de Pattin. De esta manera, se evidencia un paralelismo cultural, filosófico y epistémico, reflejado, también en la producción de conocimiento psicológico, especialmente durante el periodo de 1890 a 1925 (Dagfal, 2005). Para realizar el estudio adherimos a una historia crítica de la psicología, que contempla los aspectos sociales y culturales de la producción de conocimiento científico de la época. Comprendemos el papel que Pattin cumple en esa dinámica decreación, difusión y apropiación del conocimiento.https://historiapsi.weebly.com/uploads/1/1/7/6/11768801/actas-xiv-encuentro-tucumn.pdfFil: Fruttero, José Agustín. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Fil: Torres, Amparo. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Fil: Haure, Lucia. Universidad Nacional de Córdoba. Facultad de Psicología; Argentina.Otras Psicologí