XRD: In order to verify adsorption of safranin onto the
graphene oxide paper, XRD experiment was carried out
(Fig. 8). Graphene oxide paper has a main peak at 11.2o
with a broad band between 20 and 35o. Since adsorption
process is applied, broad band disappeared, proving
the attachment of safranin molecules onto graphene
oxide. However, safranin doesn’t have a diffraction peak
because it has an amorphous structure.
UV-Visible absorption spectroscopy:
Fig. 4. XRD data of graphene oxide paper before and
after safranin adsorption
IR: Adsorption of safranin was further proved by using
IR spectroscopy (Fig. 9). It’s clear that adsorption of
safranin results in formation of new peaks at around
2000 cm -1
Fig. 6. UV-Visible Absorption Spectra of standard safranin
solution after adsorption process
Fig. 5. IR data of graphene oxide paper before and after
safranin adsorption
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THE CLAPPER 2016 - 2017
Fig. 7. Calibration curve of standard safranin solutions