[article]
| Titre : |
Adsorption removal of Brilliant green and Safranin-O contaminants from water using a hydrogel based on carboxymethyl cellulose and sodium alginate crosslinked by epichlorohydrin |
| Type de document : |
texte imprimé |
| Auteurs : |
Khushbu, Auteur ; Vasudha Vaid, Auteur ; Nivaydita Dagar, Auteur ; Nikhil, Auteur ; Rajeev Jindal, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 407-429 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Absorbants et adsorbants
Adsorption
Alginate de sodiumL'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne.
Caractérisation
Carboxyméthylcellulose
Colloides -- Synthèse
Colorants -- Adsorption
Déchets -- Elimination
Eaux usées -- Décontamination
Eaux usées -- Epuration
ÉpichlorohydrineL'épichlorohydrine ou épichlorhydrine ou 1-chloro-2,3-époxypropane, est un composé organochloré de formule semi-développée CH2CHOCH2Cl, liquide volatil toxique, incolore à forte odeur d'ail. Un atome de carbone de l'épichlorohydrine est chiral, il existe donc deux formes énantiomères de ce composé.
hydrocolloïdes
Mesure
Réticulation (polymérisation)
|
| Index. décimale : |
667.3 Teinture et impression des tissus |
| Résumé : |
The current study investigates the adsorption properties of a chemically crosslinked hydrogel based on sodium alginate (NaALG) and carboxymethyl cellulose (CMC). The structural characteristics of the investigated hydrogel are described using information from Fourier Transform–infrared spectra, X-ray diffraction patterns and field emission scanning electron microscopy pictures. The NaALG/epichlorohydrin (ECH)/CMC hydrogel was synthesised under optimised conditions with respect to the swelling percentage. Various reaction parameters were varied to obtain the maximum swelling percentage. The synthesised hydrogel was taken as an adsorbent in the decolorisation of Brilliant green (BG) and Safranin-O (SO) dyes from water. According to the kinetic investigations, the decolorisation equilibrium of SO by NaALG/ECH/CMC was discovered in 4 hours (98.98%), while the removal of BG by NaALG/ECH/CMC took 6 hours (97.7%). Chemical processes were used to describe the decolorisation mechanisms, which significantly supported the pseudo-first-order model. NaALG/ECH/CMC hydrogel absorption was indicated to take place in monolayer adsorption form (Langmuir isotherm). The highest adsorption capacity for BG was discovered to be 864.8 mg g−1 and for SO it was 193.1 mg g−1, by synthesised hydrogel, where “mg” refers to the commercial colourant and not to the pure dye. Therefore, the synthesised hydrogel can be considered as a smart device for the adsorption of dye in water purification tasks. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Preparation of NaALG/ECH/CMC-based super adsorbent hydrogel (In Air) - Characterisation - Water absorbency measurement - Adsorption studies - Kinetics of adsorption - Adsorption equilibrium
- RESULTS AND DISCUSSION : Adsorbent synthesis and mechanism - Optimisation of various parameters - Characterisation - Mechanism for the adsorption of dyes (BG and SO) - Optimised parameter for adsorption of BG and SO - Adsorption kinetics - Adsorption isotherms - Desorption and reusability studies - Comparative analysis of dye adsorption capacity with other absorbents
- Table 1 : Optimisation table of various reaction parameters responsible for the swelling percentage of the NaALG/ECH/CMC hydrogel
- Table 2 : Coherence length, d-spacing of CMC, NaALG and the NaALG/ECH/CMC hydrogel
- Table 3 : Kinetic constants for the adsorption of BG and SO dyes on the NaALG/ECH/CMC hydrogel
- Table 4 : Various adsorption isotherms for the adsorption of BG and SO dyes on the NaALG/ECH/ALG hydrogel at optimised concentrations
- Table 5 : Comparison of NaALG/ECH/CMC with other absorbents |
| DOI : |
https://doi.org/10.1111/cote.12655 |
| En ligne : |
https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12655 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39679 |
in COLORATION TECHNOLOGY > Vol. 139, N° 4 (08/2023) . - p. 407-429
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