▎ 摘　　要

In the last few decades, production of alternative fuels has been a global concern among the environmental scientists in view of scarcity of fossil fuels and increasing global warming. Biodiesels are being synthesized as green fuel by transesterification of different oils and fats over diverse synthetically developed novel heteroge-neous catalysts. In this present work,a magnetically reusable hybrid nanocatalyst of basic nature has been designed for the production of biodiesels by transesterification of waste corn oil and rapeseed oil in presence of methanol. During the synthesis of catalyst, magnetic CuFe2O4 nanoparticles were amalgamated with graphene oxide (GO) by using pistachio leaf extract and subsequently MgO nanoparticles were impregnated over it. The catalyst was physicochemically characterized by FT-IR, SEM, TEM, EDX, elemental mapping, XRD, VSM and TGA studies. The reaction parameters like reaction time, the methanol/oil molar ratio and the catalyst loading were optimized through Response Surface Methodology (RSM) using Box-Behnken experimental design. In addition, the catalysts was magnetically retrieved quite easily and reused five times in succession without considerable loss in its reactivity in the transesterification reaction.