Simultaneous synthesis of biodiesel and zinc oxide nanoparticles using supercritical methanol

► Biodiesel and zinc oxide nanoparticles were simultaneously synthesized using supercritical methanol. ► In situ formed zinc oxide nanoparticles behaved as a catalyst for transesterification. ► GC, XRD, SEM, TEM, FT-IR were used to analyze biodiesel and zinc oxide nanoparticles. ► This new process has the potential for providing an economical advantage in scale-up operations.