2-Mercaptobenzimidazole-functionalized chitosan for enhanced removal of methylene blue: batch and column studies - IMT Mines Alès Accéder directement au contenu
Article Dans Une Revue Journal of Environmental Chemical Engineering Année : 2021

2-Mercaptobenzimidazole-functionalized chitosan for enhanced removal of methylene blue: batch and column studies

Résumé

Chitosan functionalized with 2-mercaptobenzimidazole (2-MBI) (i.e. 2-MBI@Chit) shows high sorption capacity (i.e., 1.28 mmol MB g-1) for methylene blue (MB) at pH close to 9.3). Sorption is weakly decreased (by less than 25%) by high NaCl concentration (up to 45 g L-1). The sorption (slightly endothermic) is fitted by the Langmuir equation. The kinetic profile is fitted by the pseudo-first order rate equation (PFORE): equilibrium reached within 90 min of contact. The resistance to film diffusion is minimized when setting agitation speed at 200 rpm. Dye desorption is successfully achieved (up to 94.5%) using 0.8 M; desorption kinetics is little slower than the sorption step. The loss in sorption capacity at the fifth sorption/desorption cycle does not exceed 5%. Yoon-Nelson, Bohart-Adams, and bed-depth service time equations are used for analyzing the breakthrough in fixed-bed columns. At the exhaustion of the column, the sorption capacity approaches the maximum sorption capacity in batch: all the reactive groups remain accessible in dynamic sorption mode. The dye is efficiently recovered from spiked seawater and the sorption performance is depreciated by less than 16% while comparing tap water and seawater under selected experimental conditions.
Fichier principal
Vignette du fichier
elwakeel2021.pdf (500.46 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03218182 , version 1 (11-11-2021)

Licence

Identifiants

Citer

Khalid Elwakeel, Ahmed Elgarahy, Abdullah Al-Bogami, Mohammed Hamza, Eric Guibal. 2-Mercaptobenzimidazole-functionalized chitosan for enhanced removal of methylene blue: batch and column studies. Journal of Environmental Chemical Engineering, 2021, 9 (4), pp.105609. ⟨10.1016/j.jece.2021.105609⟩. ⟨hal-03218182⟩
91 Consultations
265 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More