Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater / Shouying Wu in COLORATION TECHNOLOGY, Vol. 140, N° 3 (06/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 3 (06/2024) . - p. 496-506 Titre : Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater Type de document : texte imprimé Auteurs : Shouying Wu, Auteur ; Linping Zhang, Auteur ; Jianing Fan, Auteur ; Wei Wu, Auteur ; Bolin Ji, Auteur ; Xueling Feng, Auteur ; Bijia Wang, Auteur ; Yimeng Ma, Auteur ; Yi Zhong, Auteur ; Hong Xu, Auteur ; Zhiping Mao, Auteur Année de publication : 2024 Article en page(s) : p. 496-506 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyse Catalyseurs métalliques Colorants -- Détérioration Complexes métalliques Eaux usées -- Décontamination Eaux usées -- Epuration Fer trivalent 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. Index. décimale : 667.3 Teinture et impression des tissus Résumé : Coordination complexes were widely used in advanced oxidation processes. The ligands with various substituents could lead to differences in the catalytic properties and mechanisms. In this work, the iron(III)–N,N′-dipicolinamide (FeL) complexes (the iron(III) complexes with substituents –CH3, –H, –Cl and –NO2 named as FeL1, FeL2, FeL3 and FeL4, respectively) were used to activate hydrogen peroxide (H2O2) for degrading dyes wastewater. Mechanism studies indicated that the FeL4/H2O2 system contains the FeV=O in addition to the same •OH and O2•− as the other systems, which made it exhibit more excellent performance than others. The results of the performance tests showed that the FeL4/H2O2 system could remove 97%, 89%, 100%, 83%, 100%, and 99% of RR195, RY145, RB194, RB19, MB, and RhB, respectively, which proved the good application performance of the FeL4/H2O2 system. In addition, the performance of the FeL4/H2O2 system was not influenced by anions and natural organics. This study verified the feasibility of modulating the catalytic performance of the complexes by changing the substituents and provided an efficient catalytic system for dyeing wastewater treatment. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of ligands - Preparation of FeL - Degradation experimental procedure - Analytical methods - RESULTS AND DISCUSSION : Characterisation of structures - Substituents effects of the FeL complexes - Influence of reaction parameters on the catalytic performance of FeL4/H2O2 system - Application of FeL4/H2O2 system for degradation of dyes DOI : https://doi.org/10.1111/cote.12727 En ligne : https://drive.google.com/file/d/1zCOydXOBsDdkM88Wb6Rj2dGzz1no_U8E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40965 [article]

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Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range / Bing Li in COLORATION TECHNOLOGY, Vol. 129, N° 6 (12/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 6 (12/2013) . - p. 403-411 Titre : Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range Type de document : texte imprimé Auteurs : Bing Li, Auteur ; Yongchun Dong, Auteur ; Ding Zhizhong, Auteur Année de publication : 2013 Article en page(s) : p. 403-411 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre. L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages. Catalyse hétérogène Colorants azoïques Colorants réactifs -- Détérioration Colorants réactifs -- Effets du rayonnement ultraviolet Copolymères greffés Fenton, Réaction de Fer trivalent Greffage (chimie) Ions cuivre Oxydation pH Polytétrafluoréthylène Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polytetrafluoroethylene fibre was grafted with acrylic acid to form an effective ligand, which coordinated with Fe(III) ions to prepare an Fe(III)-grafted polytetrafluoroethylene fibre complex. The photoassisted degradation of a typical azo dye, CI Reactive Red 195, using the Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst in a wide pH range of 3–9 was investigated. In order to achieve better degradation in a higher pH range, the effect of Fe content, incorporation of Cu(II) ions and UV light irradiation on dye degradation was also examined. The results indicated that dye degradation was effective in the presence of the Fe(III)-grafted polytetrafluoroethylene fibre complex. Fast degradation of the dye can take place in an acidic environment. Increasing the Fe content or incorporating Cu(II) ions can significantly accelerate dye degradation, and UV light irradiation is much more effective than visible light irradiation in a higher pH range, especially in the alkaline pH range. Note de contenu : - EXPERIMENTAL : Materials and reagents - Graft polymerization of polytetrafluoroethylene fibres - Preparation of metal-grafted fibre complexes - Charaterisation of metal-grafted fibre complexes - Photocatalytic reaction set-up - Degradation procedure and analysis - RESULTS AND DISCUSSION : Characterisation of metal-grafted fibre complexes - Metal ions leaching from the catalyst - Heterogeneous decomposition of dye at different solution pH - Fe content of the catalyst - Cu(II) ion as the assistant metal ion - UV light irradiation DOI : 10.1111/cote.12049 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12049/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19739 [article]

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The renaissance of Fe(III) as self-tanning agent / R. Karthikeyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 4 (07-08/2011)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 4 (07-08/2011) . - p. 171-176 Titre : The renaissance of Fe(III) as self-tanning agent Type de document : texte imprimé Auteurs : R. Karthikeyan, Auteur ; R. Ramesh, Auteur ; R. Venba, Auteur ; Usha Ramamoorthy, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2011 Article en page(s) : p. 171-176 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras Couleur -- Analyse Fer trivalent Microscopie électronique à balayage Polycarboxylates Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Iron tanning is considered an alternative due to close similarity between the aqueous chemistry of Cr(III) and Fe(III). This arises primarily from the hydrolitic behaviour of Fe(III) complexes. An attempt has been made in the present study to improve the stability of Fe(III) comple by chelation with suitable ligand in order to increase the shrinkage temperature of the leather. An Fe(III) based tanning system which involves a treatment with a fatty acid and a polycarboxylate has been standardized to produce leather with shrinkage temperature (Ts)>100°C. Scanning electron microscopy on the tanned leathers was used to study the structural characteristics of leathers produced. A comparative colour analysis was studied against standard chrome leather to reveal the dyeing and colour characteristics of the proposed tanning system. The excess neutral salt used in the developed process has the tendency to reduce the acidity of the metal ion, which produces iron-tanned leather with strength properties comparable to those of chrome-tanned leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Standardization of Fe(III) based self-tanning method - Determination of shrinkage temperature - Determination of Fe(III) in spent tan liquors - Wet finishing for the leathers - Scanning electron microscopy - Physical testing and visual assessment - Colour measurement. - RESULTS AND DISCUSSION : Standardization of Fe(III) based self-tanning - Structural characterization of iron tanned leather - Physical testing and visual assessment data - Colour characteristics. En ligne : https://drive.google.com/file/d/1f7HyKj30Xc_nrwppK8EAztYFe7bWT64Q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11861 [article]

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