title: Functionalization of magnetic chitosan with graphene oxide for removal of cationic and anionic dyes from aqueous solution.
abstract: In the present study, we decorated chitosan (©) with Fe3O4 nanoparticles followed by cross-linking with GO to prepare Fe3O4 supported chitosan-graphene oxide composite (Fe3O4©-GO). Different properties of synthesized material were investigated by SEM, XRD, FTIR, TGA and EDX. Batch adsorption experiments were performed to remove toxic cationic and anionic dyes from industrial wastewater. To maximize removal efficiency of composite material, effect of pH (4-12), time (0-80min), Fe3O4©-GO dosage (2-10mg), initial dye concentration (2-30μgmL̄ (1)) and temperature (303, 313, and 323K) were studied. The uptake of dyes presented relatively fast adsorption kinetics with pseudo-second-order equation as the best fitting model. To understand the interaction of dye with adsorbent, Langmuir and Freundlich isotherm were applied. Thermodynamic studies were conducted to calculate the changes in free energy (ΔG(0)), enthalpy (ΔH(0)) and entropy (ΔS(0)). In view of practical application, the influence of ionic strength, recycling as well as investigations based on percent recoveries from spiked real water samples were also taken into account.
authors: Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan.
authors: Kashif
authors: K
authors: Gul
authors: Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan; Environmental Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Penang, Malaysia. Electronic address: saima.sohni@gmail.com.
authors: Saima
authors: S
authors: Sohni
authors: Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan.
authors: Muttaqia
authors: M
authors: Waqar
authors: Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan.
authors: Faiza
authors: F
authors: Ahmad
authors: School of Distance Education, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: N A Nik
authors: NAN
authors: Norulaini
authors: Environmental Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Penang, Malaysia. Electronic address: pultexsb@yahoo.com.
authors: Mohd Omar
authors: MO
authors: A K
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D006108:Graphite; D048271:Chitosan; D052203:Ferrosoferric Oxide
keywords: Applications; Chitosan; Dyes; Environmental remediation; Fe(3)O(4) supported chitosan-graphene oxide composite; Glutaraldehyde; Graphite powder; Isotherm; Potassium permanganate; Sodium hydroxide; Sodium nitrate; Sulfuric acid; Thermodynamic parameters