Fabrication of magnetic β-CD/chitosan nanocomposite as an efficient and recyclable dye adsorbent

ABSTRACT

In this work, novel magnetic nanocomposite adsorbents were prepared by crosslinking β-cyclodextrin (β-CD) onto chitosan backbones by using epichlorohydrin as a crosslinker and in the presence of Fe₃O₄ nanoparticles. The composition of β-CD-chitosan nanocomposites was characterized via FTIR, XRD, TEM, SEM, and VSM. Then, the as-prepared nanocomposites were treated for elimination of methyl orange (MO). The results indicated that the adsorption of MO exhibited a maximum adsorption capacity of 314 mg g⁻¹ at 25°C. Moreover, the rates and isotherm data of adsorption matched excellent at different MO concentrations (10, 60, and 120 mg/L) using second-order and Langmuir models with the regression coefficient (R²) of 0.9993 and 9990, respectively. Besides, the thermodynamic data confirmed MO adsorption as an endothermic process. The adsorbent was also confirmed as good materials for re-use and maintained 88% of its initial adsorption capacity for MO after the fifth regeneration cycles. In conclusion, the synthesized magnetic nanocomposites can be applied as cost-effective dye adsorbents with high regeneration efficiency.

Graphical Abstract

KEYWORDS:

• Β-Cyclodextrin
• chitosan
• adsorption
• nanocomposite
• methyl orange

Additional information

Notes on contributors

Ziba Jahanbakhsh

Ziba Jahanbakhsh is a second year PhD student in the Chemistry Department at Payame Noor University. Her doctoral research investigates the synthesis and properties of various nanocomposites for application in drug delivery and wastewater treatments. She holds a master’s degree in organic chemistry from the University of Urmia, Iran.

Hossein Hosseinzadeh

Hossein Hosseinzadeh, PhD, is a research faculty member and an Assistant Professor in the chemistry Department at Payame Noor University in Urmia, Iran. He received a B.S. from Mazandaran University in 1999, and an M.S. from the Sharif University of Technology at Tehran, Iran. He received his Ph.D. in Polymer Chemistry from the Sharif University of Technology in 2005.  His research interests centre around the fabrication of different hydrogel nanocomposites.

Bakhshali Massoumi

Bakhshali Masoumi is research professor of polymer chemistry at the University of Payame Noor in Tabriz for more than 30 years. He has served as an expert advisor for many MSc and PhD students. He is interested in applying polymer nanocomposites in various applications.