[article]
| 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
HydroxyapatiteL'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 |
in COLORATION TECHNOLOGY > Vol. 131, N° 4 (08/2015) . - p. 322-332
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