title: Preparation and characterization of immobilized [A336][MTBA] in PVA-alginate gel beads as novel solid-phase extractants for an efficient recovery of Hg (II) from aqueous solutions.
abstract: The coarse PVA-alginate matrix gel beads entrapping the micro-droplets of the ionic liquid tricaprylylmethylammonium 2-(methylthio) benzoate ([A336][MTBA]) as novel solid-phase extractants were prepared for the removal of mercury (II) from aqueous media. The ionic liquid [A336][MTBA] immobilized PVA-alginate beads (PVA/IL) have been characterized by FTIR, SEM and TGA. The influence of the uptake conditions was investigated including aqueous pH, PVA/IL dosage, the content of [A336][MTBA] and initial Hg (II) concentration; maximum Hg (II) ion adsorption capacity obtained was 49.89 (± 0.11)mgg(-1) at pH 5.8 with adsorptive removal of approximately 99.98%. The selectivity of the PVA/IL beads towards Hg (II), Pb (II) and Cu (II) ions tested was Hg>Pb>Cu. The rate kinetic study was found to follow second-order and the applicability of Langmuir, Freundlich and Tempkin adsorption isotherm model were tested as well. The results of the study showed that PVA/IL beads could be efficiently used as novel extractants for the removal of divalent mercury from aqueous solutions under comparatively easy operation conditions.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China. yunzhang2008@lzu.cn
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Daniel
authors.initials: D
authors.lastname: Kogelnig
authors.forename: Cornelia
authors.initials: C
authors.lastname: Morgenbesser
authors.forename: Anja
authors.initials: A
authors.lastname: Stojanovic
authors.forename: Franz
authors.initials: F
authors.lastname: Jirsa
authors.forename: Irene
authors.initials: I
authors.lastname: Lichtscheidl-Schultz
authors.forename: Regina
authors.initials: R
authors.lastname: Krachler
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Li
authors.forename: Bernhard K
authors.initials: BK
authors.lastname: Keppler
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D001565:Benzoates / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D007700:Kinetics; D008628:Mercury / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D001565:Benzoates; D006603:Hexuronic Acids; D052578:Ionic Liquids; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; C037759:trioctylmethylammonium; D020723:Glucuronic Acid; D011142:Polyvinyl Alcohol; D008628:Mercury