Degradation of CI Reactive Red 141 by heterogeneous Fenton-like process over iron-containing ZSM-5 zeolites / Yadigar C. Yaman in COLORATION TECHNOLOGY, Vol. 129, N° 1 (02/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 1 (02/2013) . - 69-75 Titre : Degradation of CI Reactive Red 141 by heterogeneous Fenton-like process over iron-containing ZSM-5 zeolites Type de document : texte imprimé Auteurs : Yadigar C. Yaman, Auteur ; Gönül Gündüz, Auteur ; Meral Dükkanci, Auteur Année de publication : 2013 Article en page(s) : 69-75 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyseurs Colorants -- Détérioration Colorants -- Oxydation Colorants réactifs Fenton, Réaction de Fer Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Zéolites Index. décimale : 667.3 Teinture et impression des tissus Résumé : The Fenton-like oxidation of CI Reactive Red 141 was investigated over iron-containing ZSM-5 zeolites. Iron was loaded by ion exchange or through hydrothermal synthesis. The oxidation process was carried out in an aqueous solution using hydrogen peroxide as the oxidant. The catalyst prepared by ion exchange with a silicon/aluminium ratio of 42 zeolite showed the highest activity (97% decolorisation and 52% chemical oxygen demand reduction at an initial pH of 3.5) after an oxidation duration of 2 h. The chemical oxygen demand reduction increased with the increasing amount of iron loaded to the zeolite. The FeZSM-5 catalyst, prepared by hydrothermal synthesis in the presence of oxalic acid, showed very good activity in terms of mineralisation (99% of chemical oxygen demand reduction). The iron leaching was noticeably low (below the European Union directives of 2 mg dm−3) for the above-mentioned catalysts. Note de contenu : - EXPERIMENTAL : Materials - Catalyst preparation - Catalyst characterisation - Catalytic activity tests - RESULTS AND DISCUSSION : X-ray diffraction studies - Scanning electron microscopy studies - FTIR studies - Nitrogen adsorption studies - Chemical composition of the ZSM-5 samples - Temperature-programmed reduction with hydrogen studies - Heterogeneous Fenton-like oxidation studies of CI Reactive Red 141 over the catalysts prepared DOI : 10.1111/cote.12001 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12001/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17189 [article]

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Preparation and characterisation of silver or copper-doped TiO2 catalysts and their catalytic activity in dye degradation / Oleksandr Lozovskyi in COLORATION TECHNOLOGY, Vol. 131, N° 3 (06/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 3 (06/2015) . - p. 245-254 Titre : Preparation and characterisation of silver or copper-doped TiO2 catalysts and their catalytic activity in dye degradation Type de document : texte imprimé Auteurs : Oleksandr Lozovskyi, Auteur ; Gönül Gündüz, Auteur ; Meral Dükkanci, Auteur ; Roman prihod'ko, Auteur Année de publication : 2015 Article en page(s) : p. 245-254 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Catalyseurs métalliques Colorants -- Détérioration Colorants -- Oxydation Dioxyde de titane Index. décimale : 667.2 Colorants et pigments Résumé : In this study, silver- or copper-doped TiO2–Ce-, TiO2–La-, and commercial TiO2 (P25)-supported catalysts were prepared. The catalysts and supports were characterised by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and nitrogen adsorption studies. UV-light-assisted heterogeneous Fenton-like oxidation of two different-structure dyes (anionic azo dye Orange II, CI Acid Orange 7 and cationic triphenylmethane dye Crystal Violet, CI Basic Violet 3) was investigated over the catalysts. Higher catalytic activity was observed in the oxidation of Orange II than in the oxidation of Crystal Violet. For both dyes, the TiO2–Ce and TiO2–La-supported catalysts, which were in the form of anatase only, gave higher photocatalytic activity than the P25-supported catalysts, which were in the form of anatase and rutile. Complete colour removal was observed during oxidation of Orange II over Cu/TiO2–Ce and Cu/TiO2–La catalysts, whereas the highest degree of decolorisation, 89.3%, was achieved by oxidation of Crystal Violet over Ag/TiO2–Ce. The pH of the solution affected the surface state of the TiO2, thus affecting the photocatalytic degradation of the dyes. The surface area of the catalysts is also a key parameter that influences their photocatalytic activity. It was observed that catalysts having higher surface areas brought about greater dye degradation. Note de contenu : - EXPERIMENTAL STUDY : Materials - Catalyst preparation - Catalyst characterisation - EXPERIMENTAL PROCEDURE - RESULTS AND DISCUSSION : Catalyst characterisation - UV-light-assisted heterogeneous Fenton-like degradation of dyes DOI : 10.1111/cote.12148 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12148 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24127 [article]

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