  The exceptional conducting nature of graphene makes it a viable candidate for
enhancing the effectiveness of photocatalytic and biomedical nanomaterials.
Herein, the immobilization of monodispersed silicon dioxide (SiO2)
nanoparticles on multiple graphene layers is demonstrated for intercalation of
graphene nanoplatelets (GNPs). Interestingly, the loading of graphene
nanoplatelets with SiO2 nanoparticles enhances the photocatalytic efficiency
from 46% to 99%. For biomedical applications, it is found that 75% of Gram
positive and 50% of Gram negative bacteria have been killed, hence bacterial
proliferation is significantly restricted. Further, the cytotoxicity study
reveals that the synthesised nanocomposites are non-toxic for both normal
(HCEC) and cancerous (MCF-7, HEp-2) cell lines which signifies their potential
as carriers for drug delivery. The prepared nanocomposites with controlled
amount of carbon in the form of graphene can be employed for photocatalysis
based waste water remediation, biomedicine and nano drug delivery
