Reduced graphene oxide-based superhydrophobic magnetic nanomaterial as high selective and recyclable sorbent for oil/organic solvent wastewater treatment

Raman Spectroscopy of Graphene, Go, Rgo

“…In the Raman spectra of the materials we obtained, there is a wide line at 826 cm -1 for graphite and an intense band at 833 cm -1 for GO and 835 cm-1 for RGO (Figure 2), which is shifted to the high-frequency region by 53 cm -1 compared with a band at 782 cm -1 in the works, referred to C -H bending vibration of the ring (Camposet al 2017). The lines located in the regions of 1031 and 1073 cm -1 were assigned to the C -C stretching associated with the respiration of the phenyl ring and possibly belong to the vibrations of the side groups (Kudaibergenova et al, 2022). The line at 1030 cm-1 in the Raman spectrum of graphite was assigned to plane vibrations of the CH 2 groups of the ring.…”

“…This fact confirms the increase in the thickness and number of defects in GO due to chemical exfoliation of graphite during oxidation. For single-layer graphene, the G´ band appears as a sharp and symmetric peak, while it becomes wider with increasing thickness in several-layer graphene (Kudaibergenova et al, 2022).…”

“…Preparation of GO and RGO. Synthesis of GO was performed according to the modified Hummers method (Hummers et al, 1958), as described in (Kudaibergenova et al, 2022). The resulting GO solution was washed with HCl and water at pH 1.1, then centrifuged and dried to constant weight.…”

“…The reduction of GO is described in (Kudaibergenova et al, 2022). NH 2 -NH 2 •H 2 O was added to the colloidal suspension of GO(figure 1).…”

“…The presence of defects in graphene oxide due to violation of π-conjugation leads to GO becoming electrically nonconducting. Removal of functional groups leads to the restoration of π -conjugation and an increase in the material's conductivity (Kudaibergenova et al, 2022). Fluctuations in the frequency range 1500 cm -1 are due to the presence of microcrystallite fragments in the structure.…”