{"id":21426,"date":"2018-03-09T09:11:12","date_gmt":"2018-03-09T09:11:12","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/decontamination-of-chlorophenoxy-acid-herbicides-in-aqueous-medium-by-advanced-electrochemical-oxidation-methods-using-boron-doped-diamond-thin-layer-film-and-o2-diffusion-electrodes\/"},"modified":"2018-03-09T09:11:12","modified_gmt":"2018-03-09T09:11:12","slug":"decontamination-of-chlorophenoxy-acid-herbicides-in-aqueous-medium-by-advanced-electrochemical-oxidation-methods-using-boron-doped-diamond-thin-layer-film-and-o2-diffusion-electrodes","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/decontamination-of-chlorophenoxy-acid-herbicides-in-aqueous-medium-by-advanced-electrochemical-oxidation-methods-using-boron-doped-diamond-thin-layer-film-and-o2-diffusion-electrodes\/","title":{"rendered":"Decontamination of chlorophenoxy acid herbicides in aqueous medium by advanced electrochemical oxidation methods using boron-doped diamond thin-layer film and o2-diffusion electrodes"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Birame Boye <\/strong><\/h2>\n<p>Se ha estudiado la degradaci\u00f3n electroqu\u00edmica de diferentes herbicidas clorofenoxi\u00e1cidos, como el \u00e1cido 4-clorofenoxiac\u00e9tico (4-cpa), el \u00e1cido 4-cloro-2-metilfenoxi\u00e1cetico (mcpa) y el \u00e1cido 2,4,5-tricloro-fenoxiac\u00e9tico (2,4,5-t), en disoluciones acuosas conteniendo hc1o4 1m o na2so4 0,05m a valores del ph entre 2.0 y 6.0. En medio de hc1o4 1 m, se ha considerado su oxidaci\u00f3n an\u00f3dica empleando un \u00e1nodo de diamante dopado con boro (bdd) y un c\u00e1todo de zirconio, encontr\u00e1ndose que todos los herbicidas son completamente destruidos al aplicar cargas entre 8 y 15 a h\/1, con altas eficiencias de corriente. En medio acuoso de na2so4 0,05m, se han tratado las disoluciones de todos los herbicidas mediante oxidaci\u00f3n an\u00f3dica con un \u00e1nodo de pt y un c\u00e1todo de grafito, oxidaci\u00f3n an\u00f3dica con electrogeneraci\u00f3n de h2o2 utilizando un c\u00e1todo de difusi\u00f3n de o2, electro-fenton con adici\u00f3n de fe2+ al medio, fotoelectro-fenton con irradiaci\u00f3n de luz uv, peroxi-coagulaci\u00f3n con un \u00e1nodo de fe y fotoperoxi-coagulaci\u00f3n con y sin regulaci\u00f3n del ph. Los procedimientos m\u00e1s efectivos son el fotoelectro-fenton, la peroxi-coagulaci\u00f3n y la fotoperoxi-coagulaci\u00f3n, que permiten la completa destrucci\u00f3n de todos los contaminantes de disoluciones saturadas de los herbicidas, operando a bajas intensidades de corriente (100 ma), normalmente entre ph 3.0 y 4.0 y a una temperatura de 35\u00c2\u00bac. El proceso electro-fenton es menos efectivo al formarse complejos estables de fe3+ con el \u00e1cido ox\u00e1lico, que es el \u00faltimo \u00e1cido carbox\u00edlico formado en todos los procesos degradativos. La oxidaci\u00f3n an\u00f3dica con \u00e1nodo de pt conduce a una pobre descontaminaci\u00f3n. El principal agente oxidante es el radical hidroxilo, que puede formarse sobre la superficie del \u00e1nodo o bien en el medio por la reacci\u00f3n catal\u00edtica de fenton entre el ion fe2+ y el h2o2 electrogenerado. En cada m\u00e9todo se ha seguido la cin\u00e9tica de destrucci\u00f3n de cada herbicida mediante cromatograf<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Decontamination of chlorophenoxy acid herbicides in aqueous medium by advanced electrochemical oxidation methods using boron-doped diamond thin-layer film and o2-diffusion electrodes<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Decontamination of chlorophenoxy acid herbicides in aqueous medium by advanced electrochemical oxidation methods using boron-doped diamond thin-layer film and o2-diffusion electrodes <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Birame Boye <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 31\/01\/2003<\/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>Enrique Brillas Coso<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Santiago Esplugas vidal <\/li>\n<li>jean-jacques Aaron (vocal)<\/li>\n<li>christos Comninellis (vocal)<\/li>\n<li>Jos\u00e9 Peral p\u00e9rez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Birame Boye Se ha estudiado la degradaci\u00f3n electroqu\u00edmica de diferentes herbicidas clorofenoxi\u00e1cidos, como el \u00e1cido 4-clorofenoxiac\u00e9tico (4-cpa), [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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