Alice Petre
Universidad de Alcala, Department of Chemical Engineering, Faculty Member
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Des catalyseurs a base d'oxyde de gallium supporte sur des supports tels que Al2O3, SiO2, TiO2, ZrO2,WO3, Nb2O5 de structure et proprietes superficielles differentes ont ete prepares par une methode d'impregnation en milieu aqueux... more
Des catalyseurs a base d'oxyde de gallium supporte sur des supports tels que Al2O3, SiO2, TiO2, ZrO2,WO3, Nb2O5 de structure et proprietes superficielles differentes ont ete prepares par une methode d'impregnation en milieu aqueux et par une methode innovante de type sol-gel. Differentes techniques d'analyse (AES-ICP, mesure de surface specifique, DRX, spectrometrie infrarouge, XPS, TEM, 71GaRMN) ont ete employees pour l'etude de la structure et du degre de dispersion de l'oxyde de gallium sur la surface des supports. Les proprietes superficielles de nos supports ont influence d'une maniere importante la dispersion de la phase active d'oxyde de gallium. L'acido-basicite des supports, de l'oxyde de gallium massique, ainsi que des catalyseurs contenant des teneurs variables en Ga2O3 a ete analysee par microcalorimetrie d'adsorption couplee a la volumetrie et par spectrometrie infrarouge qui fournit des informations complementaires sur la nature,...
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In order to promote education in environmental sustainability at higher education institutions and establish action priorities, a detailed analysis of the initial situation is needed, both in terms of courses offered and teaching and... more
In order to promote education in environmental sustainability at higher education institutions and establish action priorities, a detailed analysis of the initial situation is needed, both in terms of courses offered and teaching and assessment strategies implemented. This article presents a methodology that can be used to standardize the evaluation of teaching in environmental sustainability at different universities. We exemplify its application at the University of Alcalá, located in Central Spain. The inventory was conducted using in-house software development for the extraction of environmental sustainability concepts in the degree courses’ syllabi, completed with a survey to faculty members and a manual review to confirm its adjustment to environmental issues. Those finally selected were analyzed in depth. The main results indicate that currently, only a small part of the courses (5.5%) offered at the University explicitly include environmental sustainability content. The grad...
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The contact assay measuring the inhibition of Arthrobacter globiformis dehydrogenase activity as an endpoint to evaluate the toxicity of solid samples was tested in an international ring-test to validate its performance for ISO... more
The contact assay measuring the inhibition of Arthrobacter globiformis dehydrogenase activity as an endpoint to evaluate the toxicity of solid samples was tested in an international ring-test to validate its performance for ISO standardization (ISO/CD 18187). This work reports the results of the ring-test involving 9 laboratories from six countries. At least 8 valid data sets were obtained for each sample and more than three quarters of the participants attained the validity criteria defined in the standard. The coefficient of variation within (CV) and between (CV) laboratories was generally on average <15% and <30% for negative and positive controls, respectively. Regarding solid samples, the laboratories provided a similar ranking of the samples based on their toxicity, despite some variation in the LOEC values. The logarithmic within-lab standard deviation <0.50 for soils and <0.25 for wastes evidenced a good repeatability. The between-lab variability assessed by a CV...
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Research Interests: Geography, Education, Assessment, Atmospheric Chemistry, Climatology, and 15 moreMeteorology, Formative Assessment, Autonomy, Physics Education, Reflection, Educación, Evaluación, Atmospheric sciences, Synoptic and Mesoscale Meteorology, Summative Assessment, Autonomía, Bachelor, Reflexión, Contaminación Atmosferica, and Coordinación docente
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The treatment of a non-biodegradable agrochemical wastewater has been studied by coupling of preliminary coagulation-flocculation step and further Fenton oxidation. High percentages of chemical oxygen demand (COD) removal (up to 58 %)... more
The treatment of a non-biodegradable agrochemical wastewater has been studied by coupling of preliminary coagulation-flocculation step and further Fenton oxidation. High percentages of chemical oxygen demand (COD) removal (up to 58 %) were achieved in a first step using polyferric chloride as coagulant. This reduced significantly the amount of H2O2 required in the further Fenton oxidation. Using the stoichiometric amount relative to COD around 80 % of the remaining organic load was mineralized. The combined treatment allowed achieving the regional discharge limits of ecotoxicity at a cost substantially lower than the solution used so far where these wastewaters are managed as hazardous wastes.
Research Interests: Chemistry, Hazardous Waste, Medicine, Biological Sciences, Environmental Sciences, and 13 morePesticide, Wastewater, Pesticides, Flocculation, Iron, Ecotoxicity, CHEMICAL SCIENCES, Hydrogen Peroxide, Waste Water, Industrial Waste, Chemical Oxygen Demand, Oxidation-Reduction, and Biological Oxygen Demand Analysis
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Long chain alkylaromatics, such as n-dodecylbenzene, are important starting points for the production of surfactants and form the basis for the production of many biodegradeable detergents. It this presentation we use n-dodecylbenzene... more
Long chain alkylaromatics, such as n-dodecylbenzene, are important starting points for the production of surfactants and form the basis for the production of many biodegradeable detergents. It this presentation we use n-dodecylbenzene disproportionation as a probe for acid activity and selectivity in ionic liquid catalyzed dealkylation and disporportionation of long chain alkylaromatics. The ionic liquid catalysts used in this study comprise ionic liquid – functionalized high surface area silica materials including MCM-41. The study showed that AlCl3-based ionic liquids supported on silicas and MCM-41 are active catalytic materials for alkylbenzene (DDB) transformation (mainly disproportionation and dealkylation) at low reaction temperatures. We also concluded that the catalytic dealkylation of n-dodecylbenzene requires a high density of very strong acid sites.
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The surface properties of supported gallium oxide catalysts prepared by impregnation of various supports (γ-Al2O3, SiO2, TiO2, ZrO2) were investigated by adsorption microcalorimetry, using ammonia and water as probe molecules. In the case... more
The surface properties of supported gallium oxide catalysts prepared by impregnation of various supports (γ-Al2O3, SiO2, TiO2, ZrO2) were investigated by adsorption microcalorimetry, using ammonia and water as probe molecules. In the case of acidic supports (γ-Al2O3, ZrO2, TiO2), the acidic character of supported gallium catalysts always decreased in comparison with gallium-free supports; on very weakly acidic SiO2, new acidic
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Research Interests: Engineering, Ecotoxicology, Water Purification, Catalyst, Flocculation, and 19 moreHazardous Materials, Iron, Dissolution, Ecotoxicity, Phenol, Cosmetics, Hydrogen Peroxide, Total Organic Carbon, Industrial Waste, Industrial wastewater, Oxidation, Biodegradability, Coagulation, Sewage Treatment Plant, Cosmetic Industry Wastewater, Total Phenol, Total Phenolics, Oxidants, and Floculation
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ABSTRACT The depletion of mesoxalic and oxalic acids, two of the main by-products of wastewater ozone treatment, was studied in non-catalytic and catalytic ozonation using copper oxide supported on mesoporous silica SBA-15 as catalyst.... more
ABSTRACT The depletion of mesoxalic and oxalic acids, two of the main by-products of wastewater ozone treatment, was studied in non-catalytic and catalytic ozonation using copper oxide supported on mesoporous silica SBA-15 as catalyst. The influence of the main inorganic anions present in natural and STP effluents (bicarbonates, sulphates, chlorides and phosphates) was also studied. The non-catalytic reaction rate was strongly dependent on the presence of inorganic anions and it was also almost inhibited by the presence of particulate material. Catalysed ozonation not only accelerates organic acid depletion but was almost unaffected by the presence of these inorganic anions, or by the presence of suspended solids. The efficiency of catalytic and non-catalytic ozonation for depletion of both acids was studied in a real STP effluent. The depletion of mesoxalic acid was considerably slowed down in non-catalysed reactions, whereas under catalysed conditions it was not affected. Oxalate depletion was dominated by the formation with calcium of an insoluble salt, the precipitation equilibrium of which reversed only in the presence of a catalyst.
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... catalyst with a platinum content of 0.20 wt.% was also prepared by incipient wetness impregnation ... equation assuming a non-intersecting cylindrical pore model was used to calculate the pore ... over supported Pt catalysts was... more
... catalyst with a platinum content of 0.20 wt.% was also prepared by incipient wetness impregnation ... equation assuming a non-intersecting cylindrical pore model was used to calculate the pore ... over supported Pt catalysts was carried out at a gas hourly space velocity (GHSV) of ...
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Monolithic catalysts based on Rh/TiO2–sepiolite were developed and tested in the decomposition of N2O traces. Several effects such as the presence of NO, O2 and NO+O2 in the gas mixture, the catalysts pre-treatment and the metal loading... more
Monolithic catalysts based on Rh/TiO2–sepiolite were developed and tested in the decomposition of N2O traces. Several effects such as the presence of NO, O2 and NO+O2 in the gas mixture, the catalysts pre-treatment and the metal loading were evaluated. The system was extremely sensitive to the amount of rhodium, passing through a maximum in the catalytic activity at a Rh
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... Chem. B, 103 (1999) 1542. 7. Yu.N. Pushkar, A. Sinitsky, OO Parenago, AN Kharlanov and EV Lunina, Appl. Surf. Sci., 167 (2000) 69. RC Mehrotra, R. Bohra and DP Gaur, &quot;Metal -Diketonates and Allied Derivatives&quot;... more
... Chem. B, 103 (1999) 1542. 7. Yu.N. Pushkar, A. Sinitsky, OO Parenago, AN Kharlanov and EV Lunina, Appl. Surf. Sci., 167 (2000) 69. RC Mehrotra, R. Bohra and DP Gaur, &quot;Metal -Diketonates and Allied Derivatives&quot; Academic Press, London 1978. . S. Kawagushi, Inorg. Chem. ...
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... A. Rodríguez*, R. Rosal*, JA Perdigón-Melón*, Alice Petre*, MJ Gomez**, E. García-Calvo* and AR Fernandez-Alba ... Abstract The system ozone and hydrogen peroxide was used to reclaim wastewater from the secondary clarifier from a... more
... A. Rodríguez*, R. Rosal*, JA Perdigón-Melón*, Alice Petre*, MJ Gomez**, E. García-Calvo* and AR Fernandez-Alba ... Abstract The system ozone and hydrogen peroxide was used to reclaim wastewater from the secondary clarifier from a Sewage Treatment Plant (STP) of Alcalá ...