Résumés
Résumé
L’adsorption du Victoria Bleu Basique (VBB) sur du carton usagé (CU) a été étudiée et comparée à celle sur de la sciure de bois (SB). Le CU a été caractérisé par différentes techniques analytiques. Les paramètres influençant la réaction ont été déterminés, tels que le pH, le dosage des adsorbants et le temps de contact. L’étude cinétique a révélé que la réaction de surface s’adapte au modèle de pseudo-second ordre et que la diffusion intraparticulaire est une étape déterminante après les premières minutes. L’influence de la température sur l’adsorption a permis de déterminer les paramètres thermodynamiques (∆G°, ∆H° et ∆S°). La modélisation des résultats expérimentaux prédit une chimisorption spontanée, endothermique dont la rétention se fait suivant un mécanisme intermédiaire, entre une distribution en monocouche et celle en multicouche, sur le CU. À pH 6 la capacité d’adsorption du CU, égale à 205 mg∙g-1, est cinq fois supérieure à celle de la SB.
Mots-clés :
- carton usagé,
- sciure de bois,
- Victoria Bleu Basique,
- adsorption,
- modélisation
Abstract
The adsorption of Victoria Blue Basic (VBB) dye on used cardboard (UC) was studied and compared to that on sawdust (SD). UC was characterized by several analytical techniques. The parameters influencing the reaction, such as pH, adsorbent dosage and contact time, were determined. The kinetic study revealed that the surface reaction fits a pseudo-second order model and that intra-particle diffusion is a determining step after the first minutes of contact. The influence of temperature on the adsorption allowed the determination of the thermodynamic parameters (ΔG°, ΔH° and ΔS°). Modeling of the experimental results predicted a spontaneous, endothermic sorption, the retention of which follows an unclear mechanism, between a monolayer and multilayer distribution on the UC. At pH 6, the adsorption capacity of the UC is 205 mg∙g-1, which is five times greater than that of SD.
Keywords:
- used cardboard,
- sawdust,
- Victoria Blue Basic,
- adsorption,
- modeling
Parties annexes
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