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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Yellow pigment of Metarhizium anisopliae and its application to the dyeing of fabrics / Biaobiao Yan in COLORATION TECHNOLOGY, Vol. 135, N° 4 (08/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 4 (08/2019) . - p. 267-274 Titre : Yellow pigment of Metarhizium anisopliae and its application to the dyeing of fabrics Type de document : texte imprimé Auteurs : Biaobiao Yan, Auteur ; Muying Yang, Auteur ; Qingqing Zhou, Auteur ; Tieling Xing, Auteur ; Guoqiang Chen, Auteur ; Jiayong Sheng, Auteur Année de publication : 2019 Article en page(s) : p. 267-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres animales Jaune Laine Pigments bactériens Soie et constituants Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Microbial dyes have received substantial attention because of their natural environmental protection, simple access, and reduced regional and seasonal restriction. In this work, a microbial dye, the yellow pigment produced by Metarhizium anisopliae, was first studied then applied. The strain produced by the culture was identified, and the conditions for producing yellow pigment were optimised. Further, the stability of M. anisopliae yellow pigment was examined, and the pigment was applied to the dyeing of silk and wool fabrics. The results showed that the homology of the strain with M. anisopliae was 99.98%. In liquid fermentation culture, the optimal carbon source was glucose, and the dosage was 30 g/l. The maximum pigment yield can be obtained by culturing with 4% v/v of inoculation quantity at pH 7 and 30 °C. In addition, the effects of pH, temperature and metal ions on the yellow pigment of M. anisopliae were significant. The optimum dyeing process conditions were dyeing temperatures of 80 °C for silk and 90 °C for wool, with a dyeing time of 60 min. This research developed a novel microbial dye and studied its application for the dyeing of protein fibres. Note de contenu : - EXPERIMENTAL : Materials - Preparation of pigment solution - Identification of strains - Optimisation of medium composition and fermentation process - Dyeing - Characterisations - RESULTS AND DISCUSSION : Preparation of M. anisopliae yellow pigment solution - Identification - UV absorption spectrum and chromaticity - Optimisation of fermentation medium and process - Stability of yellow pigment - Dyeing process and colour fastness of the fabrics DOI : 10.1111/cote.12401 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12401 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32829 [article]

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