Synthesis and characterization of graphene oxide nanosheets

Preparation and Characterization of Graphene Oxide for Pb(II) and Zn(II) Ions Adsorption from Aqueous Solution: Experimental, Thermodynamic and Kinetic Study

“…The UV-Vis spectrum corresponding to Gr did not have protruding bands; the absorption spectrum was practically a line with a slight band at 270 nm; n-π * transitions could not be associated, since the UV-Vis spectrum did not reflect them [ 68 , 69 , 70 , 71 , 72 ].…”

“…Figure 4 shows the results obtained for the Gr and GO, corresponding to the analysis by infrared spectroscopy (FT-IR), which allows establishing the characteristic bands of the graphitic and graphene groups, such as hydroxyls, carbonyls, among others [ 68 , 69 , 70 , 71 ]. In Figure 4 , the FT-IR spectrum corresponding to natural graphite (marked as line A), presents a characteristic band located at ~1640 cm −1 (band C=C) that corresponds to skeletal vibrations of the graphite domains, and also shows a band in ca.…”

Graphene Oxide Decorated with Titanium Nanoparticles to Reinforce the Anti-Corrosion Performance of Epoxy Coating

“…Figure 4f shows TEM images of GO-Ti (2:1). The wrinkles and folds of GO can be clearly seen from Figure 4a, which are the characteristics of GO [28]. In addition, a large number of GO sheets are gathered together due to the effect of van der Waals forces, which makes it difficult to disperse GO in the polymer.…”

“…The O-H bending peak at 1630 cm −1 is attributed to the deformation vibration of the water, indicating that GO, f-Ti, and GO-Ti contain a small amount of adsorbed water [26,27]. The characteristic absorption peaks at 1722, 1230, 1048, and 913 cm −1 belong to C=O, C-O, C-O-C, and -CH(O)CH-, respectively [20,28,29], indicating the presence of a large number of oxygen-containing groups on the surface of f-GO. In the infrared spectra of GO-Ti, new peaks appear at 1540, 799, and 1439 cm −1 , corresponding to the secondary amide N-H-bending, N-H rocking, and C-N stretching [30], respectively, and the -CH(O)CH-absorption peak at 913 cm −1 disappears, which proves that the epoxy group of f-GO reacts with the amino group of f-Ti [31].…”

Facile synthesis of graphene oxide from graphite rods of recycled batteries by solution plasma exfoliation for removing Pb from water

“…[25][26][27][28] While the UV-Vis spectra of graphite show only one wide band with a slight transition peak of $275 nm as a characteristic of this material. [28][29][30][31][32][33] It is interesting noted that the absorption spectrum of GO aer Pb(II) adsorption has a signicant change both in curve form and in spectral intensity, the rst is the plasmon peak at 235 nm is shied to 231 nm, while the shoulder at about 310 nm is shied to the position 305 nm with a steeper slope. This result shows that Pb(II) ions were adsorbed on the surface of GO.…”