title: Design of β-cyclodextrin modified TiO(2) nanotubes for the adsorption of Cu(II): Isotherms and kinetics study.
abstract: This paper builds on previous literature showing the interesting adsorptive properties of TiO2nanotubes. It further explores the positive effect of β-cyclodextrin on these properties. Hence, β-cyclodextrin modified TiO2nanotubes were successfully prepared and characterized by XRD, N2physisorption at 77K, Raman, FTIR-ATR,1H NMR, TEM and EPR. The adsorptive interaction of Cu(II) with materials was investigated in aqueous solution at pH 9.25 (NH4+/NH3). The main conclusion is that copper(II)-ammonia complexation equilibria play an important role in the adsorption process. The β-cyclodextrin was found to improve the Cu(NH3)42+adsorption mainly by retarding its precipitation to high concentrations values (>400mgL-1). Adsorption experimental data showed good fit with the pseudo-second-order model and the Langmuir isotherm model.
authors.affiliation: Centre National des Recherches en Sciences des Matériaux, Laboratoire de Valorisation des Matériaux Utiles (LVMU), Pôle Technologique de Borj-Cédria, 8027 Soliman, Tunisia. Electronic address: mhtriki@gmail.com.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Triki
authors.affiliation: Université Tunis El Manar, Laboratoire de Chimie des Matériaux et Catalyse (LCMC), Faculté des Sciences de Tunis, 2092 El Manar, Tunisia.
authors.forename: Haythem
authors.initials: H
authors.lastname: Tanazefti
authors.affiliation: Centre National des Recherches en Sciences des Matériaux, Laboratoire de Valorisation des Matériaux Utiles (LVMU), Pôle Technologique de Borj-Cédria, 8027 Soliman, Tunisia; Université Tunis El Manar, Laboratoire de Chimie des Matériaux et Catalyse (LCMC), Faculté des Sciences de Tunis, 2092 El Manar, Tunisia.
authors.forename: Hafedh
authors.initials: H
authors.lastname: Kochkar
keywords: Cu(II)-ammonia complexes; Isotherms; Kinetics; TiO(2) nanotubes; β-cyclodextrin