Résumés
Abstract
The aim of this work was to develop new low-cost adsorbents obtained from animal origins, available in large quantities and environmentally friendly. Raw shrimp shell (RSS), a biomaterial of animal origin, is abundant, available, renewable and non-toxic. It has physicochemical properties that can induce a significant adsorptive activity. In this study, the removal of phosphate anions (H2PO4-, HPO42-) from aqueous solution by adsorption onto raw shrimp shells was studied. The surface micro-morphology of the biomaterial was investigated using scanning electron microscope and qualitative element composition was analyzed using energy dispersive X-ray and infrared spectroscopies. The efficiency of the biomaterial was investigated using a batch adsorption technique under different experiment conditions, achieved by varying parameters such as adsorbent dosage, the contact time, the initial phosphate anion concentrations, the temperature and the initial solution pH. Results show that the kinetics adsorption of phosphate ions by the biomaterial is relatively quick and the biomaterial showed a high adsorption capacity of 0.20 g∙g-1 and 0.4 g∙g-1 for HPO42- and H2PO4-, respectively. The adsorption data were analyzed using the Langmuir, Freundlich and Temkin adsorption isotherms to determine the nature of the adsorption sites. Both Langmuir and Freundlich adsorption models showed good fits to the experimental adsorption data.
Keywords:
- Adsorption,
- orthophosphate,
- shrimp shell,
- wastewater
Résumé
Cette étude s’inscrit dans le cadre de certains de nos travaux visant la valorisation de matériaux naturels d’origine végétale, animale et minérale pouvant rendre les procédés d’épuration des eaux simples et moins coûteux. Les carapaces de crevettes à l’état brut, biomatériau d’origine animale, entrent dans cette catégorie. Il est abondant, disponible, renouvelable et non toxique, et présente des propriétés physicochimiques qui peuvent induire une activité adsorbante importante. Le biomatériau a été caractérisé par microscopie électronique à balayage, par spectroscopie d’émission X et spectroscopie infrarouge. Une étude complète de l’adsorption des ions phosphates (HPO42- et H2PO4-) sur des carapace de crevettes à l’état brut a été effectuée. L’influence de paramètres physicochimiques tels que la masse d’adsorbant, le temps de contact, le pH, la température et la concentration initiale de phosphate a été étudiée. Les résultats obtenus montrent une cinétique rapide et une grande capacité de ce biomatériau à retenir les ions phosphates pouvant atteindre 0,20 g∙g-1 pour HPO42- et 0,40 g∙g-1 pour H2PO4-. Les isothermes d’adsorption étudiés (Langmuir, Freundlich et Temkin) montrent une bonne corrélation avec les modèles de Langmuir et de Freundlich.
Mots-clés :
- Adsorption,
- orthophosphates,
- carapace de crevette,
- eaux usées
Parties annexes
References
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