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The present paper reports eco-friendly preparation of a mesoporous phytoreduced graphene oxide (rGO)–zinc oxide (ZnO) nanohybrid (NH) using the leaf extract of Clerodendrum infortunatum as a green reducing agent at room temperature. The as-synthesized rGO–zinc oxide NH was characterized by diverse analytical techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy (EDS), ultraviolet-diffuse reflectance spectroscopy (UV-DRS), X-ray photoelectron, Raman spectroscopy, Brunauer–Emmett–Teller (BET) analysis, thermogravimetry and photoluminescence (PL) spectroscopy to study its structure, morphology, surface area, porosity, thermal behavior and optical properties. XRD patterns revealed the decoration of hexagonal wurtzite zinc oxide on the surface of rGO, and its composition was confirmed by EDS. UV-DRS showed slight blueshift of …