title: Chitosan-bound pyridinedicarboxylate Ni(II) and Fe(III) complex biopolymer films as waste water decyanidation agents.
abstract: Chitosan is a biopolymer with immense structural advantage for chemical and mechanical modifications to generate novel properties, functions and applications. This work depicts new pyridinedicarboxylicacid (PDC) crosslinked chitosan-metal ion films as veritable material for cyanide ion removal from aqueous solution. The PDC-crosslinked chitosan-metal films (PDC-Chit-Ni(II) and PDC-Chit-Fe(III)) were formed by complexing PDC-crosslinked chitosan film with anhydrous nickel(II) and iron(III) chloride salts respectively. The PDC-Chit and its metal films were characterized employing various analytical and spectroscopic techniques. The FT-IR, UV-vis and the XRD results confirm the presence of the metal ions in the metal coordinated PDC-crosslinked chitosan film. The surface morphological difference of PDC-Chit-Ni(II) film before and after decyanidation was explored with scanning electron microscopy. Furthermore, the quantitative amount of nickel(II) and iron(III) present in the complex were determined using Atomic Absorption Spectrophotometer as 32.3 and 37.2μg/g respectively which portends the biopolymer film as a good complexing agent. Removal of cyanide from aqueous solution with PDC-Chit, PDC-Chit-Ni(II) and PDC-Chit-Fe(III) films was studied with batch equilibrium experiments. At equilibrium, decyanidation capacity (DC) followed the order PDC-Chit-Ni (II)≈PDC-Chit-Fe(III)>PDC-Chit. PDC-Chit-Ni(II) film gave 100% CN(-) removal within 40min decyanidation owing to favorable coordination geometry.
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria. Electronic address: adewuyis@funaab.edu.ng.
authors.forename: Sheriff
authors.initials: S
authors.lastname: Adewuyi
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria.
authors.forename: Julianah Modupe
authors.initials: JM
authors.lastname: Jacob
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria.
authors.forename: Oluwatoyin Omolola
authors.initials: OO
authors.lastname: Olaleye
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria.
authors.forename: Taofiq Olanrewaju
authors.initials: TO
authors.lastname: Abdulraheem
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria.
authors.forename: Jubril Ayopo
authors.initials: JA
authors.lastname: Tayo
authors.affiliation: Department of Chemistry, University of Agriculture Abeokuta, P M B 2240, Abeokuta, Ogun State, 110001, Nigeria; Department of Chemistry, University of Reading, RG6 UR6, Berkshire, UK.
authors.forename: Fatai Oladipupo
authors.initials: FO
authors.lastname: Oladoyinbo
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003486:Cyanides / Q000737:chemistry / Q000302:isolation & purification*; D007501:Iron / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D002264:Carboxylic Acids; D048271:Chitosan; D003486:Cyanides; D007501:Iron; D009532:Nickel; D009942:Organometallic Compounds; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical
keywords: Biopolymer film and decyanidation; Chitosan; Pyridinecarboxylate; iron(III); nickel(II)