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

Journal of Chemical Health Risks

مقاله 4، دوره 8، شماره 4، اسفند 2018، صفحه 289-304   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.22034/jchr.2018.544709

نویسندگان

Meysam Akbarzadeh¹؛ Mohammad Taghi Vardini^{* 1}؛ Gholam Reza Mahdavinia²

¹Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran

²Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran

چکیده

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.

کلیدواژه‌ها

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

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