Évaluation des propriétés de charbons actifs de résidus de Moabi (Baillonella toxisperma Pierre) par adsorption d'iode en solution aqueuse

Abstract

L’adsorption d’une solution aqueuse d’iode a été étudiée, en régime discontinu, sur quatre échantillons de charbons actifs des résidus de Moabi (Baillonella toxisperma Pierre) d’origine camerounaise (C1, C2, C3, C4) et sur trois échantillons de charbons actifs commerciaux (C5, C6, C7). Le calcul de l’indice d’iode et l’analyse des isothermes d’adsorption par utilisation des théories de Langmuir et de Freundlich ont permis de déterminer le type d’adsorption. Il apparaît que la valeur de l’indice d’iode de l’un des échantillons des charbons des résidus de Moabi (C4) est proche des valeurs de celui des échantillons commerciaux. De plus, l’adsorption de l’iode obéit aux isothermes de Langmuir avec des capacités maximales d’adsorption variant entre 9,35 mmol∙g‑1 (C4) et 13,18 mmol∙g‑1 (C7).The removal of iodine through adsorption on four types of activated carbon (C1, C2, C3, C4) obtained from local Cameroonian Moabi (Baillonella toxisperma Pierre) residues and on three commercial activated carbons (C5, C6, C7) was studied in a batch mode. The calculation of the iodine index and the analysis of adsorption isotherms obtained using the Langmuir and Freundlich theories allow for the determination of the classification of adsorption. It was found that the iodine index of one activated carbon obtained from Moabi residues (C4) is near to those obtained for the commercial activated carbons. Moreover, the iodine adsorption is clearly described by the Langmuir theory with the maximum capacity of adsorption varying between 9.35 mmol∙g‑1 (C4) and 13.18 mmol∙g‑1 (C7)

Optimized preparation of activated carbon with high porosities based on puck shells ( Afrostyrax lepidophyllus ) by response surface methodology and physico-chemical characterization

“…The spectra of the different materials obtained by FTIR spectroscopy show a weak peak around 2923 cm −1 for CRN which is characteristic of the valence vibration of the C-H bond [39]. This peak is not pronounced on the spectra of the prepared ACs.…”

Application of an Experimental Design Methodology to Optimize the Synthesis Conditions of an Activated Carbon from Palm Kernel Shell

“…The microporosity of activated carbons was assessed by the iodine number method according to the protocol described by Abuiboto et al, (2016). According to this protocol, a mass of 0.2 g of activated carbon is brought into contact under agitation in an Erlenmeyer flask with a volume of 20 mL (V ads ) of an iodine solution (C 0 = 0.02 mol.L -1 ).…”

Preparation and Characterization of Activated Carbon Based on Wood (<i>Acacia auriculeaformis</i>, Côte d’Ivoire)

“…However, because of the high cost of preparation of activated carbon which restricts its frequent use, several scientists have studied this problem in order to find low-cost precursors to prepare activated carbon. Thus, several studies have been conducted in this direction to prepare activated carbons from plant materials such as rice straw [10], coconut shell [11] [12] [13], tamarind wood [14] [15] and from mineral materials [16]. Their production can be Journal of Encapsulation and Adsorption Sciences done in two ways, either by physical activation or chemical activation.…”