Effect of surfactants and electrolyte on removal and recovery of basic dye bu using ficus arica cellulosic fibers as biosorbent / Deepak Pathania in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 4 (07-08/2012) . - p. 306-314 Titre : Effect of surfactants and electrolyte on removal and recovery of basic dye bu using ficus arica cellulosic fibers as biosorbent Type de document : texte imprimé Auteurs : Deepak Pathania, Auteur ; Shikha Sharma, Auteur Année de publication : 2012 Article en page(s) : p. 306-314 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Biosorbant Bleu de méthylène Chimie de l'environnement Désorption Electrolytes Fibres cellulosiques Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Natural cellulosic fiber derived from Ficus carica, was used as eco-friendly biosorbent after alkali treatment for methylene blue dye remediation from aqueous system. The biosorbent was characterized by instrumental techniques such as Fourier transform infrared spectroscopy and scanning electron microscopy. The equilibrium behavior of the biosorbent was investigated in presence of electrolyte and surfactants by batch adsorption experiments. It was observed that in presence of ionic surfactants such as sodium dodecylbenzenesulfonate (SDS) and cetyltrimethyl ammonium bromide (CTABr), the adsorption capacity decreased from 38.97 mg g–1to 35.64 mg g–1and 36.75 mg g–1respectively. The equilibrium data were analyzed using the Langmuir and Freundlich isotherm models and were best represented by the Langmuir isotherm model. The pseudo second order kinetic model adequately describes the kinetic data in comparison to first order model. Thermodynamic studies indicated that the adsorption was endothermic and spontaneous. The desorption studies illustrated that the removal of methylene blue dye at optimized condition was 64.95%, out of which 41.53% of methylene blue dye can be recovered by desorption in first cycle. Thus, the biosorbent used in this work proved to be effective materials for the treatment of dye contaminated aqueous systems. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15550 [article]

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Methylene blue adsorption by chemically activated waste pork bones / Unai Iriarte-Velasco in COLORATION TECHNOLOGY, Vol. 131, N° 4 (08/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 4 (08/2015) . - p. 322-332 Titre : Methylene blue adsorption by chemically activated waste pork bones Type de document : texte imprimé Auteurs : Unai Iriarte-Velasco, Auteur ; Irene Sierra, Auteur ; Emilio Atilano Cepeda, Auteur ; Raquel Bravo, Auteur ; Jose Luis Ayastuy, Auteur Année de publication : 2015 Article en page(s) : p. 322-332 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu de méthylène Colorants -- Adsorption Déchets organiques -- Recyclage Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Index. décimale : 667.3 Teinture et impression des tissus Résumé : Bone is an inorganic template containing organic material inside which can be converted into hydroxyapatite-rich material by pyrolysis. Nowadays, there is a growing research interest in the use of hydroxyapatite, the chemical formula of which is Ca10(PO4)6(OH)2. In the present work, pork bone, an abundant biomass source and food waste, has been converted into structured porous hydroxyapatite by a three-step process including precharring under mild conditions, chemical activation, and thermal activation. The investigated activating agents were NaOH, KOH, K2CO3, H2SO4, and H3PO4. A thorough investigation of the influence of different activating protocols on the chemical and textural properties of the produced material was carried out by nitrogen adsorption–desorption at 77 K, potentiometric titrations, Fourier transform infrared, and X-ray diffraction techniques. Chemical activation with NaOH, K2CO3, and H2SO4 increased the specific surface area up to 53%. H3PO4 reduced both surface area and pore volume, and KOH showed little influence on the pore structure. The produced materials were evaluated by methylene blue adsorption tests and showed significant improvement as a result of chemical activation. As a main effect, acid treatment increased methylene blue adsorption kinetics, probably owing to an increase in micropororosity, whereas alkali activation enhanced the adsorption capacity of the resultant biochar. Note de contenu : - EXPERIMENTAL : Materials - Physicochemical characterisation - Adsorption tests - RESULTS AND DISCUSSION : Mass yield - Pore size distribution and textural properties - Physicochemical characterisation - Adsorption kinetics : intraparticle diffusion model - Equilibrium adsorption DOI : 10.1111/cote.12160 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12160 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24433 [article]

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Microcolumn adsorption studies of acid/basic dyes related to the physicochemical properties of the adsorbent / Unai Iriarte-Velasco in COLORATION TECHNOLOGY, Vol. 130, N° 1 (02/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 1 (02/2014) . - p. 62-72 Titre : Microcolumn adsorption studies of acid/basic dyes related to the physicochemical properties of the adsorbent Type de document : texte imprimé Auteurs : Unai Iriarte-Velasco, Auteur ; Jon I. Alvarez-Uriarte, Auteur ; María Gonzàlez-Marco, Auteur ; Juan R. Gonzàlez-Velasco, Auteur Année de publication : 2014 Article en page(s) : p. 62-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Acides Adsorption Alizarine L'alizarine est un colorant rouge d'origine végétale, extrait de la racine de la garance des teinturiers (Rubia tinctorum L.), une plante vivace de la famille des Rubiacées, autrefois largement cultivée pour la teinture qu'elle fournissait. Bases (chimie) Bleu de méthylène Colorants acides Index. décimale : 667.3 Teinture et impression des tissus Résumé : The adsorptive removal of cationic Methylene Blue and anionic Alizarin Red S was analysed in microcolumn tests. A detailed analysis of the influence of adsorbent surface acidity/basicity, elemental composition, Brunauer–Emmett–Teller area, pore distribution, and point-of-zero-charge pH on breakthrough properties was carried out. The characteristics of the mass transfer zone were used for evaluation of column performance. Four different activated carbons with different physical and chemical properties were analysed. It was concluded that, for adsorbents containing pores smaller than 1.7 times the solute molecular radius, the interactions between surface and solute have the greatest influence on the effective usage of column uptake capacity. A column packed with adsorbent characterised by large enough pores readily removed either anionic or cationic solutes. Partial correlation analysis revealed that the adsorption of cationic dye (Methylene Blue) was more sensitive to adsorbent textural properties in comparison with anionic dye (Alizarin Red S). Maximum column capacities were 3–4 times higher for cationic Methylene Blue than for anionic Alizarin Red S, with values of 494 and 107 mg/g respectively. The higher solubility of Alizarin Red S could be responsible for its lower and more even removal efficiencies. Finally, the surface chemistry of the adsorbent affected how the operating conditions influenced the column performance, as deduced from the opposite effect of flow rate on the adsorption of Methylene Blue by each adsorbent. Note de contenu : - MATERIAL AND METHODS : Column adsorption - Adsorbates - Characterisation of activated carbons - Assessment of column performance - RESULTS AND DISCUSSION : Textural properties and surface chemistry - Effect of adsorbent physicochemical properties on column performance - Effect of solute-surface interactions - Effect of operating conditions : flow rate DOI : 10.1111/cote.12058 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12058 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20361 [article]

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Microwave-assisted preparation of pyrite and its sensitisation of titanium dioxide in self-cleaning aramid fabrics / Chenghui Zheng in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 284-291 Titre : Microwave-assisted preparation of pyrite and its sensitisation of titanium dioxide in self-cleaning aramid fabrics Type de document : texte imprimé Auteurs : Chenghui Zheng, Auteur ; Chang-E Zhou, Auteur ; Zhenming Qi ; Qingqing Zhou ; Chaoxia Wang Année de publication : 2018 Article en page(s) : p. 284-291 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Angle de contact Bleu de méthylène Caractérisation Colorants -- Détérioration Dioxyde de titane Dispersions et suspensions Fibre aramide Micro-ondes Photocatalyse Photodétérioration Pyrite La pyrite est une espèce minérale composée de disulfure de fer (FeS2), polymorphe de la marcassite ; elle peut contenir des traces de nickel (Ni), cobalt (Co), arsenic (As), cuivre (Cu), zinc (Zn), argent (Ag), or (Au), thallium (Tl), sélénium (Se) et vanadium (V). Résistance au rayonnement ultraviolet Textiles et tissus auto-nettoyants Textiles et tissus synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Titanium dioxide (TiO2) dispersions were obtained by neutralising anatase nano‐titanium dioxide sols prepared by hydrolysing tetrabutyl titanate in acidic aqueous media. Pyrite was initially prepared via the microwave‐assisted method with a mixed solvent of ethylene glycol and small amounts of water, and was then used in sensitising micron‐sized titanium dioxide particles to obtain aramid fabrics with self‐cleaning properties. X‐ray diffraction demonstrated the crystalline structure of pyrite, and ultraviolet‐visible (UV‐vis) spectrum and energy‐dispersive X‐ray spectroscopy characterised the band gaps, surface status on fabrics and the distribution of the pyrite compound's titanium dioxide particles. The contact angle, UV protection factor (UPF) and photocatalytic degradation of methylene blue (MB) were used to evaluate the performance of treated aramid fabrics. Results show that pyrite‐sensitised titanium dioxide compounds obtained at pH 5 have smaller band gap energies and relatively poor wetting abilities, higher UPF values, and perform well in the photocatalytic degradation of MB. The pseudo‐first kinetic model was used to analyse elaborate sections of the curve for the degradation of MB. Note de contenu : - EXPERIMENTAL : Materials - Preparation of titanium dioxide dispersions - Preparation of pyrite - Treatment of aramid fabrics - Characterisation - RESULTS AND DISCUSSION : X-ray diffraction - UV-vis diffuse spectra - EDS analysis - UPF - Contact angles - Photocatalytic degradation of MB - Tables : 1. Contact angles of water droplets on aramid fabrics - 2. Pseudo-first kinetic parameters and half-life of the photocatalytic degradation of MB DOI : 10.1111/cote.12348 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12348 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30923 [article]

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A new colorimetric assay for antioxidant capacity and photostability / Elisabet Fernández-García in COLORATION TECHNOLOGY, Vol. 132, N° 3 (06/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 3 (06/2016) . - p. 195-200 Titre : A new colorimetric assay for antioxidant capacity and photostability Type de document : texte imprimé Auteurs : Elisabet Fernández-García, Auteur ; Hayat Heluani-Gahete, Auteur ; Ralf E. Wellinger, Auteur Année de publication : 2016 Article en page(s) : p. 195-200 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Bleu de leucométhylène Bleu de méthylène Colorimétrie Photostabilité Index. décimale : 667.3 Teinture et impression des tissus Résumé : The antioxidant capacity of cysteine, glutathione, N-acetylcysteine, and ascorbic acid to reduce Methylene Blue to colourless Leucomethylene Blue was analysed. Interestingly, transient exposure of Leucomethylene Blue to sunlight resulted in a reversible oxidation reaction and thus, provided a fast, easy, and simple quantitative assay to determine antioxidant capacity and photostability of biologically relevant antioxidants. Note de contenu : - MB to MBH2 reduction capacity correlates with antioxidant redox potential - Determination of antioxidant photostability by MBH2 oxidation upon sunlight exposure DOI : 10.1111/cote.12210 En ligne : https://drive.google.com/file/d/1s2D0yhapwm3hhKKCAZQuoqc9OuyAB99C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26350 [article]

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Reduction of methylene blue by ascorbic acid : kinetic and thermodynamic aspects / H. J. Y. El-Aila in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

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Removal of methylene blue from aqueous solutions by using cold plasma- and formaldehyde-treated onion skins / Cafer Saka in COLORATION TECHNOLOGY, Vol. 127, N° 4 (2011)

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Self-cleaning performance of sol–gel-derived TiO2/SiO2 double-layer thin films / Byeong-Min Kim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

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The study of imidazoles gemini surfactants as retarders for the dyeing of cationic dyes on polyacrylonitrile fabrics / Jiliang Cao in COLORATION TECHNOLOGY, Vol. 134, N° 2 (04/2018)  

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Thermal regeneration of spent coal-based activated carbon using carbon dioxide : process optimisation, Methylene Blue decolorisation isotherms and kinetics / Xin-Hui Duan in COLORATION TECHNOLOGY, Vol. 128, N° 6 (2012)  

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