{"id":109660,"date":"2018-03-11T10:35:11","date_gmt":"2018-03-11T10:35:11","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/degradacion-fotocatala%c2%adtica-de-xenobioticos-en-agua-potable-mediante-procesos-avanzados-de-oxidacion-paos\/"},"modified":"2018-03-11T10:35:11","modified_gmt":"2018-03-11T10:35:11","slug":"degradacion-fotocatala%c2%adtica-de-xenobioticos-en-agua-potable-mediante-procesos-avanzados-de-oxidacion-paos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/plaguicidas\/degradacion-fotocatala%c2%adtica-de-xenobioticos-en-agua-potable-mediante-procesos-avanzados-de-oxidacion-paos\/","title":{"rendered":"Degradaci\u00f3n fotocatal\u00edtica de xenobi\u00f3ticos en  agua potable mediante procesos avanzados de oxidaci\u00f3n (paos)"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Marina Martinez Menchon <\/strong><\/h2>\n<p>La contaminaci\u00f3n del agua se puede definir como la acci\u00f3n y el efecto de introducir materias o formas de energ\u00eda, o inducir condiciones en el agua que, de modo directo o indirecto, impliquen una alteraci\u00f3n perjudicial de su calidad en relaci\u00f3n con los usos posteriores o con su funci\u00f3n ecol\u00f3gica. Esto hace que la disponibilidad del agua potable se reduzca y que se tengan que recurrir a m\u00e9todos de tratamiento, m\u00e1s o menos costosos, para extraer los residuos y evitar da\u00f1os indirectos en el ecosistema, aunque no siempre se consigue. en este contexto, proponemos el empleo de procesos avanzados de oxidaci\u00f3n (paos), concretamente fotoqu\u00edmicos (foto-fenton y fotocat\u00e1lisis heterog\u00e9nea) mediante el empleo de la luz solar para la eliminaci\u00f3n, o al menos reducci\u00f3n, de los niveles residuales de determinados xenobi\u00f3ticos, de caracter\u00edsticas f\u00edsico-qu\u00edmicas distintas, y efectos nocivos sobre el medio ambiente. el empleo de procesos avanzados de oxidaci\u00f3n, como m\u00e9todo de eliminaci\u00f3n de xenobi\u00f3ticos en aguas est\u00e1 basado en procedimientos catal\u00edticos y fotoqu\u00edmicos capaces de producir cambios profundos en la estructura qu\u00edmica de los contaminantes. Estos procesos, que utilizan luz solar uv, est\u00e1n basados en la generaci\u00f3n de radicales hidroxilo (muy oxidantes), capaces de degradar de manera r\u00e1pida a muchas sustancias org\u00e1nicas hasta co2, h2o y sales minerales. As\u00ed, si este proceso natural se optimiza y se aceleran las reacciones que se dan entre un fotocatalizador (sales de fe o semiconductores como tio2, zno, sno2. Etc.) Y un oxidante (h2o2 o s2o82-), el proceso se presenta como un interesante y sencillo m\u00e9todo de eliminaci\u00f3n casi total de xenobi\u00f3ticos, en contra de otros m\u00e9todos m\u00e1s costosos que s\u00f3lo traspasan el contaminante de un lugar a otro, sin eliminarlo realmente. en este trabajo, se ha estudiado la degradaci\u00f3n fotocatal\u00edtica de ocho plaguicidas, seis hidrocarburos arom\u00e1ticos polic\u00edclicos y cuatro trihalometanos mediante empleo de zno y tio2 (fotocat\u00e1lisis heterog\u00e9nea) y fe2+ (fotocat\u00e1lisis homog\u00e9nea) a nivel de planta piloto. Los resultados obtenidos ponen de manifiesto la efectividad del tratamiento en la eliminaci\u00f3n de los compuestos estudiados, principalmente al emplear zno y fe2+. En t\u00e9rminos generales, el modelo cin\u00e9tico de pseudo primer orden (monof\u00e1sico) explica de manera satisfactoria el comportamiento de los distintos grupos, aunque en determinados casos, los modelos bif\u00e1sicos se ajustan mejor a los resultados obtenidos. Finalmente, se ha realizado la evaluaci\u00f3n econ\u00f3mica del tratamiento de descontaminaci\u00f3n solar. palabras clave: agua, plaguicidas, hidrocarburos arom\u00e1ticos polic\u00edclicos, trihalometanos, fotocat\u00e1lisis solar. photocatalytic degradation of xenobiotic compounds in drinking water by advanced oxidation processes (aops) marina mart\u00ednez mench\u00f3n department of agricultural chemistry, geology and pedology. University of murcia. Spain. ph. D. Dissertation to obtain the doctor in environmental sciences degree. abstract water pollution can be defined as the action and effect of introducing matters or energy forms, or to induce conditions in the water that, in a direct or indirect way, imply a harmful alteration of its quality in connection with the later uses or with its ecological function. This makes that the availability of drinking water decreases and therefore, we have apply treatment methods, more or less expensive, to extract the residues and avoid indirect damages in the ecosystem, although it is not always possible. in this context, we propose the use of advanced oxidation processes (aops), concretely photochemical (photo-fenton and heterogeneous photocatalysis) processes under solar irradiation, for the elimination or at least reduction of the residue levels of certain xenobiotic compounds with different phisico-chemical characteristics and harmful effects on the environment. these processes (aops), as method for the elimination of pollutants in water are based in the generation of hydroxyl radicals (highly oxidants) capable of quickly degrading organic substances to co2, h2o and mineral salts. Thus, if this natural process is optimized and the reactions between a photocatalyst (fe2+\/fe3+, or semiconductors like tio2, zno or sno2) and oxidants such as h2o2 o s2o82- are accelerated, the process is shown as an interesting and simple method to eliminate pollutants unlike other methods which are only able to move them from one place to another without getting their elimination. with this aim, in this work the photocatalytic degradation of eight pesticides, six polycyclic aromatic hydrocarbons and four trihalomethanes at pilot plant scale has been studied. For this purpose, zno and tio2 (heterogeneous photocatalysis) and fe2+ (homogeneous photocatalysis) have been use as photosensitizers. The obtained results show that the addition of photocatalysts, mainly zno and fe2+, strongly enhances the degradation rate of pollutants.. In a general way, the pseudo first-order model (monophasic model) satisfactorily explained the degradation process for the different xenobiotic classes, although in some cases, the biphasic models better predict the results obtained. Finally, the economic evaluation of the solar detoxification treatment has been carried out. keywords: drinking water, pesticides, polycyclic aromatic hydrocarbons, trihalomethanes, solar photocatalysis.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Degradaci\u00f3n fotocatal\u00edtica de xenobi\u00f3ticos en  agua potable mediante procesos avanzados de oxidaci\u00f3n (paos)<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Degradaci\u00f3n fotocatal\u00edtica de xenobi\u00f3ticos en  agua potable mediante procesos avanzados de oxidaci\u00f3n (paos) <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Marina Martinez Menchon <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Murcia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 30\/06\/2011<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Simon Navarro Garcia<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Antonio Cerda cerda <\/li>\n<li>Manuel Francisco Garcia-legaz vera (vocal)<\/li>\n<li>ramon Madrid vicente (vocal)<\/li>\n<li>Jos\u00e9 Saez mercader (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marina Martinez Menchon La contaminaci\u00f3n del agua se puede definir como la acci\u00f3n y el efecto de 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