title: Chitosan/sporopollenin microcapsules: preparation, characterisation and application in heavy metal removal.
abstract: Use of natural polymers as biosorbents for heavy metal removal is advantageous. This paper reports a study aiming to design a novel biosorbent from two biomacromolecules; chitosan, a versatile derivative of chitin, and sporopollenin, a biopolymer with excellent mechanical properties and great resistance to chemical and biological attack. Chitosan/sporopollenin microcapsules were prepared via cross-linking and characterised by employing scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. Sorption performance of the microcapsules and the plain chitosan beads were tested for Cu(II), Cd(II), Cr(III), Ni(II) and Zn(II) ions at different metal ion concentration, pH, amount of sorbent, temperature and sorption time. The adsorption pattern followed Langmuir isotherm model and the sorption capacity of the chitosan/sporopollenin microcapsules was found to be Cu(II): 1.34, Cd(II): 0.77, Cr(III): 0.99, Ni(II): 0.58 and Zn(II): 0.71 mmol g(-1). Plain chitosan beads showed higher affinity for the ions; Cu(II): 1.46, Cr(III): 1.16 and Ni(II): 0.81 mmol g(-1) but lower for Cd(II): 0.15 and Zn(II): 0.25 mmol g(-1). Sporopollenin enhanced Cd(II) and Zn(II) ions sorption capacity of the chitosan microcapsules. Chitosan/sporopollenin microcapsules can be used in Cd(II) and Zn(II) metal removal.
authors: Selcuk University, Faculty of Science, Department of Chemistry, 42075 Konya, Turkey. Electronic address: idrissargin@hotmail.com.
authors: İdris
authors: İ
authors: Sargın
authors: Selcuk University, Faculty of Science, Department of Biochemistry, 42075 Konya, Turkey.
authors: Gulsin
authors: G
authors: Arslan
mesh_terms: D000327:Adsorption; D001704:Biopolymers / Q000737:chemistry*; D002214:Capsules; D002338:Carotenoids / Q000138:chemical synthesis* / Q000737:chemistry*; D048271:Chitosan / Q000138:chemical synthesis* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D019216:Metals, Heavy / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013818:Thermogravimetry; D013997:Time Factors
chemical_list: D001704:Biopolymers; D002214:Capsules; D007477:Ions; D019216:Metals, Heavy; D012996:Solutions; C009800:sporopollenin; D002338:Carotenoids; D048271:Chitosan
keywords: Chitosan; Heavy metal; Sporopollenin