title: Graphene oxide coated with porous iron oxide ribbons for 2, 4-Dichlorophenoxyacetic acid (2,4-D) removal.
abstract: Graphene oxide (GO) was prepared from commercially available graphite powder. Porous iron oxide ribbons were grown on the surface of GO by solvothermal process. The prepared GO-Fe3O4nanocomposites are characterized by FT-IR, XRD, VSM, SEM, TEM, Raman spectroscopy, surface functionality and zero point charge studies. The morphology of the iron oxide ribbons grown on GO is demonstrated with TEM at various magnifications. The presence of magnetite nanoparticles is evident from XRD peaks and the magnetization value is found to be 37.28emu/g. The ratio of intensity of D-peak to G-peak from Raman spectrum is 0.995. The synthesized Graphene oxide-Fe3O4nanocomposites (GO-Fe3O4) were explored for its surface adsorptive properties by using a model organic compound, 2,4-Dichlorophenoxy acetic acid (2,4-D) from aqueous solution. Batch adsorption studies were performed and the equilibrium data are modelled with Langmuir, Freundlich and Temkin isotherms. The maximum monolayer capacity from Langmuir isotherm is 67.26mg/g. Kinetic studies were also carried out and the studied adsorption process followed pseudo second-order rate equation. Mechanism of the adsorption process is studied by fitting the data with intraparticle diffusion model and Boyd plot. The studied adsorption process is both by film diffusion and intraparticle diffusion.
authors.affiliation: Department of Chemical Engineering, Manipal Institute of Technology, Manipal, Karnataka 576104, India.
authors.forename: S
authors.initials: S
authors.lastname: Nethaji
authors.affiliation: Chemical Engineering Area, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, India. Electronic address: arumugamsivasamy@yahoo.co.in.
authors.forename: A
authors.initials: A
authors.lastname: Sivasamy
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000327:Adsorption; D004058:Diffusion; D005290:Ferric Compounds / Q000737:chemistry*; D006108:Graphite / Q000138:chemical synthesis / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D010087:Oxides; C000499:ferric oxide; D015084:2,4-Dichlorophenoxyacetic Acid; D006108:Graphite
keywords: 2,4-Dichlorophenoxy acetic acid; Adsorption dynamics; Graphene oxide; Iron oxide ribbons