Heterogeneous binary nanocomposite based photocatalysis is a potential strategy to resolve the worldwide ecological issues. Here, graphitic carbon nitride (g-C3N4) containing NiOnanocomposite (NC) was synthesized by simple mixing. Pure NiO and g-C3N4 was synthesised by hydrothermal and thermal decomposition methods respectively. As synthesized g-C3N4, NiO, and NiO/g-C3N4, composite were characterized by XRD, FTIR, UV-vis spectroscopy, FE-SEM, and HR-TEM. NiO nanoparticles were uniformly distributed on C3N4 matrix. Photocatalytic degradation of Rhodamine B (RhB) was investigated under visible light irradiation. The results confirm that 81% of RhB was degraded within 60 min under NiO/g-C3N4 visible light system. This study suggests that potential in environmental applications.