Effect of oxidation debris on spectroscopic and macroscopic properties of graphene oxide |
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| Affiliation: | 1. Uranium Extraction Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Desalination Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Faculty of Environment, University of Jan Evangelista Purkyně, Králova Vý?ina 7, 400 96 Ústí nad Labem, Czech Republic;2. Department of Materials Chemistry, Institute of Inorganic Chemistry AS CR v.v.i., Husinec-?e? Sq. 1001, 250 68 ?e?, Czech Republic;3. Department of Chemistry and Physics of Surfaces and Biointerfaces, Institute of Macromolecular Chemistry, AS CR v.v.i., Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic;4. Faculty of Science, University of Jan Evangelista Purkyně, ?eské Mláde?e 8, 400 96 Ústí nad Labem, Czech Republic;5. Faculty of Science, University of Hradec Králové, Jana Koziny 1237, 500 03 Hradec Králové, Czech Republic |
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| Abstract: | Oxidation debris (OD) and graphene oxide (GO) before and after OD removal were characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, mass spectroscopy, X-ray diffraction, transmission electron microscopy and potentiometric titration, respectively. OD removal decreased GO absorption intensity in UV/Vis spectra, caused changes in peak position and absorption intensity in FTIR spectra, and resulted in the decrease of ID/IG in Raman spectra. OD was amorphous and had higher content of acidic groups than purified GO. OD contributed 10–25% of overall surface charge density to unpurified GO in spite of small amount (ca. 1% mass). OD removal decreased significantly GO dispersibility in aqueous solution, but increased obviously the electrical conductivity of reduced graphene oxide (rGO) and the apparent density of compacted rGO. The removal of OD was necessary because of its striking effects on both GO spectroscopic and macroscopic properties. Batch desorption in NaOH solution was recommended for OD removal from as-prepared graphite oxide because of slow OD desorption kinetics. |
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