The grape extract
is a potential natural reducing agent because
of its high phenolic content. The extracts of seeds, skin, and pulp
of grape were prepared by digestion, grinding, and soxhlet methods
and used for reducing graphene oxide (GO). The reduced GO made using
the soxhlet extract of grape seed (GRGO) was hydrothermally treated
with titanium dioxide (TiO
2
) for the synthesis of GRGO–TiO
2
nanocomposite. The X-ray diffraction (XRD), thermogravimetric
analysis (TGA), Fourier transform infrared (FT-IR), UV–vis,
photoluminescence, and Raman spectra studies further confirmed the
formation of GRGO and the GRGO–TiO
2
hybrid. Scanning
electron microscope and transmission electron microscope studies showed
the decoration of spherical TiO
2
particles (<100 nm)
on the few-layered GRGO sheets. The GRGO–TiO
2
hybrid
was explored as a working electrode for supercapacitors and visible
light photocatalyst for water decontamination. GRGO–TiO
2
showed higher specific capacitance (175 F g
–1
) than GRGO (150 F g
–1
) and TiO
2
(125
F g
–1
) in an aqueous electrolyte. GRGO–TiO
2
exhibited 83.6% capacitance retention even after 2000 cycles,
indicating the good stability of the material. Further, under visible
light irradiation (λ > 400 nm), GRGO–TiO
2
showed
∼30% higher photo-oxidation of the bromophenol blue (BPB) dye
than TiO
2
. Also, GRGO–TiO
2
decreased
the total organic carbon content of BPB from 92 to 18 ppm. Overall,
the soxhlet extract of grape seed was found to be a cost-effective
reducing agent for the preparation of GRGO, which is a suitable material
to be used in supercapacitors and photocatalysis.
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