▎ 摘　　要

A one-step, simple preparation of plant extract mediated reduced graphene oxide nanocomposite (Bi2O3@RGO) is performed by using an aqueous extract of flowers of Aerva javanica. The reduction of metal and graphene oxide for nanocomposite preparation is done in a single step where the metabolites present in A. javanica played a significant role as reducing and stabilizing agents to prevent agglomeration. UV/Vis, X-ray diffraction, and Fourier transform infrared analysis confirmed the anchoring of bismuth oxide nanoparticles on RGO sheets with an average particle size of 12 nm calculated by Scherrer's formula. The as-prepared nanocomposite displayed significant potential as photocatalyst in solar-driven photodegradation of industrial dyes, that is, Alizarin yellow (Al-Y), Methylene blue (MB), and Lissamine green (LG). The results indicated that 25 mg of synthesized material was able to perform 32.51%, 41.50%, and 52.89% degradation of Lissamine green, Alizarin yellow, and Methylene blue, respectively, in 1.5-2 h using sunlight irradiation. Bi2O3@RGO is found more efficient for the photodegradation of MB and photo-degradation of all dyes obeyed pseudo-first-order kinetics. Furthermore, this work was encouraging, as plants extract mediated nanocomposite was found to be useful in mg amount for environmental protection applications.