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234 results on '"Arana, J."'

2. Sequencing paired tumor DNA and white blood cells improves circulating tumor DNA tracking and detects pathogenic germline variants in localized colon cancer

Author

Gimeno-Valiente, F., Martín-Arana, J., Tébar-Martínez, R., Gambardella, V., Martínez-Ciarpaglini, C., García-Micó, B., Martínez-Castedo, B., Palomar, B., García-Bartolomé, M., Seguí, V., Huerta, M., Moro-Valdezate, D., Pla-Martí, V., Pérez-Santiago, L., Roselló, S., Roda, D., Cervantes, A., and Tarazona, N.

Published
2023
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32. 918P Deciphering the molecular drivers behind locoregional progression, intratumoral heterogeneity, and clonal evolution in locally advanced head and neck cancer

Author

Bruixola, G., Martin-Arana, J., Gimeno-Valiente, F., Català-Senent, J.F., Carbonell-Asins, J.A., Alfaro-Cervello, C., Camblor, D.G., Martínez-Castedo, B., García-Mico, B., Grimalt Ferrer, N., Segui-Manzaneque, V., Escorihuela-García, V., Léon-Guijarro, J.L., Iglesias, M.E., Dualde, D., Pons, O., Cervantes, A., and Tarazona Llavero, N.

Published
2024
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33. 583P COMPReS study: Multiomic profiling reveals organ-specific differences in metastases and identifies novel predictive biomarkers in relapsed localized colon cancer

Author

García-Mico, B., Gimeno-Valiente, F., Martin-Arana, J., Martínez-Castedo, B., Camblor, D.G., García-Bartolomé, M., Palomar, B., Ciarpaglini, C. Martinez, Segura, M. Cabeza, Gambardella, V., Català-Senent, J.F., Moro, D., Garcia-Botello, S., Pérez, L., Keranen, S. Rosello, Fleitas, T.C., Huerta, M., Perez, D. Roda, Cervantes, A., and Llavero, N. Tarazona

Published
2024
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41. Comparative study of photocatalytic degradation mechanisms of pyrimethanil, triadimenol, and resorcinol

Author

Arana, J., Rodriguez, C. Fernandez, Melian, J.A. Herrera, Diaz, O. Gonzalez, and Pena, J. Perez

Subjects
Fungicides -- Chemical properties, Catalysis -- Evaluation, Resorcinols -- Chemical properties, Photochemical research, Engineering and manufacturing industries, Environmental issues
Abstract

The photocatalytic degradation of an endocrine disruptor (resorcinol) and of two fungicides (pyrimethanil and triadimenol) has been studied and compared. The effect of pH, oxygen, and [H.sub.2][O.sub.2] on the photocatalytic degradation of these compounds has been established. The three organics were analyzed by means of high pressure liquid chromatography (HPLC) and their mineralization by total organic concentration (TOC) measurements. The evolution of the toxicity to Lemna minor of the aqueous solutions of the three organics during their photocatalytic treatment has also been studied. The obtained results have been interpreted according to Fourier transform infrared studies on the interaction of the molecules with the catalyst surface and their reaction mechanisms by gas chromatographpy-mass spectrometry (GC-MS) analyses. The toxicity studies have shown that some intermediates acted as nutrients or toxicity antagonists as negative growth rate inhibitions were obtained. After 30 min of reaction, the resorcinol and pyrimethanil solutions were detoxified, although some amount of the organics still remained. In the case of triadimenol, a 92% detoxification was achieved after 60 min of reaction. The solar photocatalytic degradations of the pollutants have resulted to be comparable with those obtained with UV lamp. The obtained results suggest that the type of interaction of pyrimethanil and triadimenol with the Ti[O.sub.2] surface decides their degradation mechanism by which the effect of pH, [H.sub.2][O.sub.2], and dissolved oxygen is determined. It has also been confirmed that the photocatalytic techniques are very efficient at the detoxification of wastewaters contaminated with these fungicides. Keywords: photocatalysis, resorcinol, pyrimethanil, triadimenol, toxicity

Published
2008

42. Comparative study of phenolics degradation between biological and photocatalytic systems

Author

Melian, J.A. Herrera, Arana, J., Ortega, J.A., Munoz, F. Martin, Rendon, E. Tello, and Pena, J. Perez

Subjects
Catalysis -- Evaluation, Phenols -- Chemical properties, Hydroquinone -- Chemical properties, Wetlands -- Environmental aspects, Photochemical research, Engineering and manufacturing industries, Environmental issues
Abstract

Phenol and phenol compounds are toxic organics that can be found in many industrial wastewaters. Biological wastewater treatments are considered to be the most convenient methods owing to their efficiency and low economic cost. Nonetheless, many organic pollutants are refractory to bacterial degradation. Photocatalytic methods can be an interesting alternative as pretreatment to improve biodegradability and reduce toxicity of industrial effluents. The goal of this study was to compare and combine Ti[O.sub.2]-photocatalysis with constructed wetlands to obtain a low-cost method for the treatment of phenolic wastewater. The degradation of phenol was studied by means of Ti[O.sub.2]-photocatalysis (solar and UV-lamp) in batch reactors. The degradations of phenol and two of its photocatalytic degradation intermediates, catechol and hydroquinone, were studied in wetland reactors with and without two wetland plants: common reed (Phragmites australis) and papyrus (Cyperus alternifolius). The application of pseudo first-order kinetics to the elimination of phenol in the wetland reactors provided high correlation coefficients ([R.sup.2] = 0.85-0.99), allowing the comparison of the biological and photocatalytic methods. Although higher concentrations of phenol (250-400 mg/l) could be treated, the elimination of 50 ppm was usually accomplished in batch experiments in less than 15 h, the rime in which low or nil solar radiation is available for Ti[O.sub.2]-photocatalysis. As a consequence, this concentration can be considered to be the upper limit for the wetland influent. The degradations of catechol and hydroquinone showed higher rate constants (0.2-0.4 [h.sup.-1]) than that of phenol (about 0.15 [h.sup.-1]), particularly in the reactor with common reed (1-2 [h.sup.-1]). The degradation of phenol by the photocatalytic methods was three to four times faster than those obtained with the wetland reactors. By using solar Ti[O.sub.2]-photocatalysis, concentrations of phenol up to 100 ppm were reduced down to 16 ppm and 27 ppm of phenol and hydroquinone, respectively, in about 7 h. However, it was toxic. When this sample was continuously (38 ml/min) added to wetland reactors with common reed, phenol and hydroquinone concentrations were below their detection limits (1 ppm and 2 ppm, respectively). Solar Ti[O.sub.2]-photocatalysis is a promising technique for the treatment of phenol but its application is limited to daytime periods with appropriate weather conditions. Constructed wetlands can also eliminate phenol and phenolic compounds without these limitations, but the toxicity of the influent must be as low as possible. The combination of both methods can provide a low-cost method for the treatment of phenolic wastewater. Keywords: phenol, catechol, hydroquinone, toxicity, Ti[O.sub.2]-photocatalysis, wetland reactors

Published
2008

45. The effect of modifying Ti[O.sub.2] on catechol and resorcinol photocatalytic degradation

Author

Arana, J., Rodriguez, J.M. Dona, Diaz, O. Gonzalez, Melian, J.A. Herrera, and Pena, J. Perez

Subjects
Titanium dioxide -- Chemical properties, Catechin -- Properties, Resorcinols -- Properties, Decomposition (Chemistry) -- Observations, Catalysis -- Observations, Solar energy research, Engineering and manufacturing industries, Environmental issues
Abstract

The photocatalytie features of Ti[O.sub.2] doped with ferric oxides or mixed with activated carbon (AC-Ti[O.sub.2]) are compared with those of the unmodified Degussa P-25 Ti[O.sub.2]. These new catalysts show specific structural features that alter catechol and resorcinol photodegradabilities, according to their chemical structures. For instance, we have observed that Fe oxides located on the Ti[O.sub.2] particle surface hamper these dihydroxy, benzenes degradation. Likewise, AC-Ti[O.sub.2] catalysts have shown improved catechol photodegradability, with respect to that of Ti[O.sub.2], while that of resorcinol is not altered. These studies show that catechol and resorcinol adsorption patterns are different, i.e., they have different adsorption centres on the catalyst surface and are differently affected by photonic flux variations. [DOI: 10.1115/1.2391225]

Published
2007

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