title: Electrochemical regeneration of a reduced graphene oxide/magnetite composite adsorbent loaded with methylene blue.
abstract: In this work, two different reduced graphene oxide/iron oxide (rGO-IO) nanocomposites with different iron oxide loadings were fabricated using a one-step solvothermal method. The structure, properties and applications of the synthesized nanocomposites were evaluated with Raman spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, electron microscopy, and energy-dispersive X-ray spectroscopy. The iron oxide is in the form of magnetite (Fe3O4), so that the resultant adsorbent can readily be separated from the treated water using a magnetic field. The ability of the nanocomposites to remove methylene blue (MB) from water by adsorption was investigated. The highest adsorptive capacity observed was 39 mg g-1, for the composite containing 60 wt% iron oxide. The adsorptive capacity of the rGO-IO decreased to 26 mg g-1when the mass fraction of iron oxide was increased to 75 wt%. Electrochemical regeneration of MB loaded rGO-IO was also investigated. The electrochemical regeneration was found to be rapid and with low electrical energy consumption relative to conventional adsorbents, due to the high electrical conductivity and nonporous surface of the rGO. A regeneration efficiency of 100% was obtained after 30 min of electrochemical treatment using a 2 mm thick bed of rGO-IO loaded with 39 mg g-1MB, using a current density of 10 mA cm-2. Multiple adsorption-electrochemical regeneration cycles demonstrated that the surface of the rGO was modified leading to increase in the adsorptive capacity to around 80 mg g-1after the second regeneration cycle. The morphology of the rGO was observed to change significantly after electrochemical regeneration, suggesting that the rGO based adsorbent materials could only be used for a few cycles.
authors.affiliation: University of Calgary, Department of Chemical and Petroleum Engineering, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
authors.forename: Farbod
authors.initials: F
authors.lastname: Sharif
authors.affiliation: University of Calgary, Department of Chemical and Petroleum Engineering, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
authors.forename: Luke R
authors.initials: LR
authors.lastname: Gagnon
authors.affiliation: University of Calgary, Department of Chemistry, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
authors.forename: Suresh
authors.initials: S
authors.lastname: Mulmi
authors.affiliation: University of Calgary, Department of Chemical and Petroleum Engineering, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada. Electronic address: edward.roberts@ucalgary.ca.
authors.forename: Edward P L
authors.initials: EP
authors.lastname: Roberts
mesh_terms: D052203:Ferrosoferric Oxide; D006108:Graphite / Q000737:chemistry*; D008751:Methylene Blue; D010087:Oxides / Q000737:chemistry; D012038:Regeneration
chemical_list: D010087:Oxides; D006108:Graphite; D008751:Methylene Blue; D052203:Ferrosoferric Oxide
keywords: Adsorption; Electrochemical regeneration; Magnetite; Methylene blue; Nanocomposite; Reduced graphene oxide