title: Efficient removal of lead (II) ions and methylene blue from aqueous solution using chitosan/Fe-hydroxyapatite nanocomposite beads.
abstract: Chitosan is a well-known sorbent and effective in the uptake of anionic or reactive dyes, but it has deficiency in adsorption of basic dyes. In this work, chitosan/Fe-substituted hydroxyapatite composite beads were prepared in a different ratio via embedding of hydroxyapatite into chitosan solution for removal of basic dye and heavy metal from aqueous solution. The composite beads were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy in order to reveal their composition and surface morphology. In this particular study, methylene blue (MB) and lead (Pb (II)) ions were selected as representatives of dye and a heavy metal, respectively. The various experimental conditions affecting dye adsorption were explored to achieve maximum adsorption capacity. Moreover, the kinetic, thermodynamic and adsorption isotherm models were employed for the description of the heavy metal and dye adsorption processes. The results indicated that the prepared hydrogel is an efficient adsorbent for the aforementioned dye and metal concomitant with the ability of regeneration without losing the original activity and stability for water treatment applications.
authors.affiliation: Department of Chemistry, Eastern Mediterranean University, Gazimagusa, TRNC via Mersin 10, Turkey. Electronic address: samaneh.saber@gmail.com.
authors.forename: Samaneh
authors.initials: S
authors.lastname: Saber-Samandari
authors.affiliation: New Technologies Research Center, Amirkabir University of Technology, Tehran, Iran.
authors.forename: Saeed
authors.initials: S
authors.lastname: Saber-Samandari
authors.affiliation: Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran.
authors.forename: Nader
authors.initials: N
authors.lastname: Nezafati
authors.affiliation: Department of Chemistry, Eastern Mediterranean University, Gazimagusa, TRNC via Mersin 10, Turkey.
authors.forename: Kovan
authors.initials: K
authors.lastname: Yahya
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry; D017886:Durapatite / Q000737:chemistry; D006801:Humans; D007854:Lead / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead; D048271:Chitosan; D017886:Durapatite; D008751:Methylene Blue
keywords: Adsorption; Chitosan; Composite bead; Iron substituted hydroxyapatite; Water treatment