Colorimetric chemosensor for Cu(II) from electrospun nanofibrous mat mixed with 5-methoxy-salicylaldehyde azine / Apisit Karawek in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 38-46 Titre : Colorimetric chemosensor for Cu(II) from electrospun nanofibrous mat mixed with 5-methoxy-salicylaldehyde azine Type de document : texte imprimé Auteurs : Apisit Karawek, Auteur ; Pipattra Mayurachayakul, Auteur ; Apisama Dilokpramuan, Auteur ; Choladda Srisuwannaket, Auteur ; Kornkanya Pratumyot, Auteur ; Withawat Mingvanish, Auteur ; Mongkol Sukwattanasinitt, Auteur ; Pinit Kidkhunthod, Auteur ; Nakorn Niamnont, Auteur Année de publication : 2022 Article en page(s) : p. 38-46 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Capteurs chimiques Caractérisation Colorimétrie Composés organiques -- Synthèse Electrofilature Ions cuivre Ligands Nanofibres Index. décimale : 677.46 Cellulosiques : rayonnes, acetates Résumé : The condensation product of 5-methoxy-salicylaldehyde with hydrazine hydrate (referred to below as compound 1) was used as a ligand in a cellulose acetate electrospun nanofibrous mat to determine copper ions in aqueous solutions. The electrospun nanofibrous mats, based on cellulose acetate mixed with compound 1, were constructed using an electrospinning method and had a diameter of 260 nm. The sensing nanofibrous mat exhibited a sensitive and selective response for Cu(II) ions over a linear concentration range of 1-30 µM in a 0.1 M HEPES buffer (pH 7.4) using a colorimeter. The detection limit of the method was 1.04 µM lower than the maximum level of Cu(II) in drinking water (16 µM, as determined by the US Environmental Protection Agency). Additionally, it exhibited high selectivity for Cu(II) ions over 13 other cations. The sensing nanofibrous mat was fully reversible for ethylenediamine tetraacetic acid treatment cycles. Preliminary results indicated the sensitivity and selectivity of the nanofibrous mat for detecting Cu(II) ions by naked-eye detection from yellow to orange. The reaction product of compound 1 and the Cu(II) ion was studied using X-ray absorption spectroscopy. The Cu-coordination number was approximately 5.023 ± 1.42, and the Cu–N distance (R) was 1.986 Ã…. The nanofibrous mat demonstrated a convenient and straightforward Cu(II) ion-detection technique in both wastewater and water environments. Note de contenu : - EXPERIMENTAL : Materials and methods - Analytical instruments - Synthesis of compound - Electrospinning and characterisation of CA nanofibrous mat mixed with compound - General procedure for visual detection of Cu(II) ions of the nanofibrous mat using a colorimeter - X-ray absorption near-edge structure measurement for Cu-oxidation number determination of compound 1–Cu complex - Real samples of Cu(II) detection using the nanofibrous mat - RESULTS AND DISCUSSION : Synthesis of compound - Fabrication and characterisation of compound 1-incorporated CA nanofibrous mat - Optimal conditions for Cu(II) ion-sensing using the nanofibrous mat - Cu(II) ion detection - Interference study - XANES measurement for Cu-oxidation number determination of compound 1–Cu complex - Real sample detection - The reusability and reproducibility of the nanofibrous mat - Table 1 : The percentage recovery data for the detection of Cu(II) in spiked wastewater samples (n = 3) - Table 2 : Comparison of the Cu(II) ion-sensing properties of different sensors DOI : https://doi.org/10.1111/cote.12567 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12567 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37497 [article]

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Dyeing of cotton with the natural dye extracted from waste leaves of green tea (Camllia sinensis var. assamica) / Sukemi in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 121-126 Titre : Dyeing of cotton with the natural dye extracted from waste leaves of green tea (Camllia sinensis var. assamica) Type de document : texte imprimé Auteurs : Sukemi, Auteur ; Kornkanya Pratumyot, Auteur ; Choladda Srisuwannaket, Auteur ; Nakorn Niamnont, Auteur ; Withawat Mingvanish, Auteur Année de publication : 2019 Article en page(s) : p. 121-126 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants végétaux Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Teinture -- Fibres textiles Thé vert et constituants Index. décimale : 667.3 Teinture et impression des tissus Résumé : Due to an increase in the production of green tea, the amount of leaf waste has increased enormously, causing serious environmental problems. With regard to environmental awareness, the possibility of reusing the waste leaves of green tea as a low‐cost and abundantly available source of natural dye for dyeing cotton fibres was investigated. Natural dye powder from the waste leaves of green tea (NDPT) was successfully applied to dye cotton fibres without mordant by batch experiments. NDPT was obtained as a dark brown powder with a yield of 2.7 ± 0.5% w/w from dried waste leaves of green tea. The optimal conditions for dyeing NDPT onto cotton fibres were: pH of dye solution, 3 ; material to liquor ratio, 100:1 ; dyeing time, 180 min ; concentration of dye solution, 3.0 mg/ml ; and dyeing temperature, 100 °C. The colour of cotton fibres dyed with NDPT was observed to be dark brown. The adsorption data of NDPT on cotton fibres was best fitted with a Langmuir adsorption isotherm model with a correlation coefficient (R2) of 0.997. It is clear that there is a strong possibility of reusing the waste leaves of green tea as a low‐cost and abundantly available source of natural dye for dyeing cotton fibres. Note de contenu : - EXPERIMENTAL : Materials - Preparation of natural dye powder - Preparation of solutions of natural dye powder from the waste leaves of green tea - Phytochemical screening for natural dye powder from the waste leaves of green tea - Preparation of cotton fibres for dyeing with NDPT - General procedure for dyeing cotton fibres - The adsorption isotherm of cotton fibres dyed with NDPT - RESULTS AND DISCUSSION : Characteristics and phytochemical screening of NDPT - Optimal conditions for dyeing cotton fibres with NDPT - Absorption isotherm DOI : 10.1111/cote.12381 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12381 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32325 [article]

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