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Reduced graphene oxide-bismuth silicate-graphitic carbon nitride (rGO/BSO/g-C₃N₄) heterostructured nanocomposites was synthesised by wet-impregnation method. The morphology, microscopic, structural composition and optical properties of the nanocomposites were characterised, before and after modification of the materials with different amounts of rGO, using XRD, FTIR, TEM, HR-TEM, UV-Vis DSR, PL and BET analysis. The rGO/BSO/g-C₃N₄ nanocomposites are of high crystallinity. TEM images revealed the presence of wrinkled aggregates of rGO on layers of BSO and g-C₃N₄ sheets. A band gap energy of 2.34 eV was achieved in compositing, which results in increase in the composites absorption capacity and reduced photoluminescence emission. The reduced PL emission suggests decreased recombination of the photon-induced electron-hole pair, due to the decoration of rGO on the surface of the …