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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20089	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Self-cleaning bombyx mori silk : room-temperature preparation of anatase nano-TiO2 by the sol-gel method and its application / Chenghui Zheng in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 280-287 Titre : Self-cleaning bombyx mori silk : room-temperature preparation of anatase nano-TiO2 by the sol-gel method and its application Type de document : texte imprimé Auteurs : Chenghui Zheng, Auteur ; Zhenming Qi, Auteur ; Wenchao Shen, Auteur ; Guoqiang Chen, Auteur Année de publication : 2014 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Dioxyde de titane Essais (technologie) Nanoparticules Soie et constituants Sol-gel, Procédé Textiles et tissus auto-nettoyants Index. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this work was to obtain anatase nano-TiO2 by the sol–gel method at room temperature and to achieve self-cleaning Bombyx mori silk fabrics. Nano-TiO2 sols based on an aqueous system and an ethanol system were prepared separately by the sol–gel method using tetrabutyl orthotitanate as a precursor at room temperature. Particle size analyses showed that nano-TiO2 particles in an aqueous system were much bigger and more variant than those in ethanol. X-ray diffraction patterns revealed a pure anatase phase of nano-TiO2 in an aqueous system. Crystalline transformation of TiO2 from anatase to rutile by photoradiation at ambient temperature was also proved. Thermogravimetric and differential scanning calorimetric analyses confirmed the phase transformation of nano-TiO2. A scanning electron microscope equipped with an energy-dispersive spectrometer was used to investigate the surface morphology and elements of Bombyx mori silk fabrics. The contact angles with water, the kinetics of photocatalytic degradation of Methylene Blue, and decontamination of red-wine-stained fabrics under ultraviolet radiation demonstrated that the fabrics had good self-cleaning properties and photoinduced hydrophilicity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of nano-TiO2 sols - Self-cleaning finishing of bombyx mori silf fabrics - Characterisation and testing - RESULTS AND DISCUSSION : Particle size analyses of TiO2 sols - Characterisationof sol residues - Scanning electron microscope and energy-dispersive X-ray spectrometer analyses - Contact angle analysis DOI : 10.1111/cote.12092 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12092 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21780 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16443	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)