Abstract
Two dimensional (2D) heterostructures in combination with other 2D materials play a vital role to boost photocatalytic efficiency owing to increase in interfacial charge separation/transferring rate. Graphene modified NiO 2D-2D nanocomposites were prepared via wet impregnation method and confirmed by various spectroscopic and analytical techniques. XRD patterns of pure and composites confirmed the characteristic peaks of NiO and graphene. NiO nanosheets are uniformly dispersed on graphene sheets which facilitate interfacial coupling between them as observed in SEM images. UV–Vis spectra of composite showed band gap reduction from 3.3 to 2.3 eV owing to incorporation of graphene sheets. Further, suppression of charge carriers was confirmed by photoluminescence spectra. Consequently, 10.0% graphene/NiO composite exhibits increased photocatalytic activity towards MO degradation under visible light due to strong interfacial coupling and 2D-2D surface morphologies of photocatalysts which are beneficial to suppress the charge recombination and provide massive reactive sites.
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