Preparation of a Novel Magnetic Nanocomposite Hydrogel Based on Carboxymethyl Chitosan for the Adsorption of Crystal Violet as Cationic Dye

Subject Areas : Journal of Chemical Health Risks

Meysam Akbarzadeh ¹ , Mohammad Taghi Vardini ² , Gholam Reza Mahdavinia ³

1 - Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 - Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran
3 - Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran

Received: 2018-08-22 Accepted : 2018-10-27 Published : 2018-12-01

Keywords: Langmuir isotherm, Crystal Violet (CV), Carboxymethyl chitosan (CMC), Magnetic montmorillonite (m-MMT), Kinetics of adsorption,

Abstract :

The novel magnetic carboxymethyl chitosan/poly (acrylic amide) hydrogel (m-CMC-PAMH) was prepared using magnetic montmorillonite (m-MMT) and characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) techniques. Results showed that m-CMC-PAMH has been prepared successfully properties without damaging the crystal structure of Fe3O4. Adsorption capacity of Crystal Violet (CV) on the m-CMC-PAMH was 72.4 mg/g. The CV adsorption well described by the pseudo-second-order kinetics and Langmuir isotherm equations. The positive value of the enthalpy change ΔH° (23.5 kJ/mol) showed that the adsorption was endothermic and physical in nature. The value of Gibbs free energy change ΔG° was found to be -9.7 kJ/mol at 295 K for m-CMC-PAMH, which shows spontaneity of the CV adsorption. So, m-CMC-PAMH can be used as a low-cost alternative to other adsorbents for the removal of dyes from aqueous solutions.

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