Adsorption behavior of cationic and anionic dyes on magadiite-chitosan composite beads

Adel Mokhtar; Soumia Abdelkrim; Amal Djelad; Amina Sardi; Bouhadjar Boukoussa; Mohamed Sassi; Abdelkader Bengueddach

doi:10.1016/j.carbpol.2019.115399

Adsorption behavior of cationic and anionic dyes on magadiite-chitosan composite beads

Carbohydr Polym. 2020 Feb 1:229:115399. doi: 10.1016/j.carbpol.2019.115399. Epub 2019 Oct 3.

Authors

Adel Mokhtar¹, Soumia Abdelkrim², Amal Djelad², Amina Sardi³, Bouhadjar Boukoussa⁴, Mohamed Sassi², Abdelkader Bengueddach²

Affiliations

¹ Département de Génie des Procédés, Institut des Sciences et Technologies, Centre Universitaire Ahmed Zabana Relizane, Algeria; Laboratoire de Chimie des Matériaux LCM, Université Oran1 Ahmed Ben Bella, El- Mnaouer, BP 1524, 31000, Oran, Algeria. Electronic address: mokhtar.adel80@gmail.com.
² Laboratoire de Chimie des Matériaux LCM, Université Oran1 Ahmed Ben Bella, El- Mnaouer, BP 1524, 31000, Oran, Algeria.
³ Département de Chimie, Faculté des Sciences Exactes et Informatique, Université Hassiba Ben Bouali, Chlef, 02000, Algeria.
⁴ Laboratoire de Chimie des Matériaux LCM, Université Oran1 Ahmed Ben Bella, El- Mnaouer, BP 1524, 31000, Oran, Algeria; Département de Génie des Matériaux, Faculté de Chimie, Université des Sciences et de la Technologie Mohamed Boudiaf, El-Mnaouer, BP 1505, Oran, Algeria.

PMID: 31826489
DOI: 10.1016/j.carbpol.2019.115399

Abstract

In this paper, the composite beads were obtained by the encapsulation of a lamellar polysilicate magadiite in chitosan. The composite beads were tested as adsorbents for the removal of anionic Congo red (CR) and cationic methylene blue (MB) dyes. The obtained material was characterized by different methods such as XRD, SEM, TGA and zeta potential analysis. The adsorption mechanism of both dyes was supported by UV-vis and (FTIR) spectroscopy. The results reveal that the magadiite was immobilized in the chitosan matrix by hydrogen bond and electrostatic interactions. The influence of contact time, adsorbent dose and initial concentration of dye were investigated. The adsorption kinetics of CR onto composite beads followed the linear form of pseudo-second-order model and their equilibrium data were fitted well to the linear Langmuir model as confirmed by the calculated values of R², RMSE and SD. The adsorbed quantity registered for CR and MB dyes are 135.77 and 45.25 mg/g, respectively.

Keywords: Chitosan; Congo red; Hydrogel; Layered silicate; Methylene blue; Removal.