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Abstract
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Graphene quantum dots (GQDs) immobilized nanosilica was prepared under microwave irradiated
green reaction conditions and was used as an efficient heterogeneous acid catalyst. The structure of nano-catalyst
was characterized by FT-IR, PL, TEM, XRD, FE-SEM, EDS, TGA, and zeta potential. Xanthene derivatives were
synthesized in excellent yields using the freshly prepared catalyst and the catalyst could be easily recovered and
recycled for 5 times without significant loss of its catalytic activity. The structures of the resulted products were
confirmed by FT-IR, 1H-NMR, 13C-NMR spectroscopic techniques.
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