Removal of atrazine from aqueous solutions onto a magnetite/chitosan/activated carbon composite in a fixed-bed column system: optimization using response surface methodology.

Autor: Agani I; Laboratoire de Chimie de l'Eau et de l'Environnement (LCEE), Ecole Normale Supérieure de Natitingou Benin jacquesfatombi@yahoo.fr +229-97895404., Fatombi JK; Laboratoire de Chimie de l'Eau et de l'Environnement (LCEE), Ecole Normale Supérieure de Natitingou Benin jacquesfatombi@yahoo.fr +229-97895404.; Laboratoire d'Expertise et de Recherche en Chimie de l'Eau et de l'Environnement (LERCEE), UAC Benin., Osseni SA; Laboratoire de Chimie de l'Eau et de l'Environnement (LCEE), Ecole Normale Supérieure de Natitingou Benin jacquesfatombi@yahoo.fr +229-97895404., Idohou EA; Laboratoire de Chimie de l'Eau et de l'Environnement (LCEE), Ecole Normale Supérieure de Natitingou Benin jacquesfatombi@yahoo.fr +229-97895404., Neumeyer D; Centre d'Elaboration de Matériaux et d'Etudes Structurales, Université de Toulouse - UPS 29 rue Jeanne Marvig, Cedex 4 31055 Toulouse BP 94347 France., Verelst M; Centre d'Elaboration de Matériaux et d'Etudes Structurales, Université de Toulouse - UPS 29 rue Jeanne Marvig, Cedex 4 31055 Toulouse BP 94347 France., Mauricot R; Centre d'Elaboration de Matériaux et d'Etudes Structurales, Université de Toulouse - UPS 29 rue Jeanne Marvig, Cedex 4 31055 Toulouse BP 94347 France., Aminou T; Laboratoire d'Expertise et de Recherche en Chimie de l'Eau et de l'Environnement (LERCEE), UAC Benin.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2020 Nov 13; Vol. 10 (68), pp. 41588-41599. Date of Electronic Publication: 2020 Nov 13 (Print Publication: 2020).
DOI: 10.1039/d0ra07873e
Abstrakt: In this study, a magnetite/chitosan/activated carbon (MCHAC) composite is proposed as an efficient adsorbent for the removal of atrazine from aqueous solutions. The prepared composite was characterized using Fourier-transform infrared (FTIR) and X-ray diffraction (XRD) methods. Response surface methodology (RSM) coupled with composite central design (CCD) were used to optimize the effects of the four independent variables, pH, initial concentration of atrazine ( C 0 ), bed depth ( H ), and flow rate ( Q ), which influence the adsorption process. The experimental results modeled using response surface methodology (RSM) coupled with central composite design (CCD) (RSM-CCD) indicated a quadratic relationship with p < 0.0001 for adsorption capacity at saturation ( q s ) and fraction of bed utilization (FBU). The results of the experiments performed under the optimized conditions, pH = 5.07, C 0 = 137.86 mg L -1 , H = 2.99 cm and Q = 1.038 mL min -1 , showed a q s value of 62.32 mg g -1 and FBU of 72.26%, with a deviation value of less than 0.05 from the predicted q s and FBU values. The obtained breakthrough curves were fitted with four mathematical models, Thomas, Bohart-Adams, Yan and Yoon-Nelson, in order to determine the limiting step of the mass transfer of the atrazine adsorption onto the composite. A desorption study of the composite revealed the high reuse potential for MCHAC, thus, the prepared material could be used as a low-cost and efficient adsorbent for the decontamination of polluted wastewater.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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