Fig. 4From: The untapped industrial crop, Cucumeropsis mannii: dry oil extraction, characterization and potential use as biodiesel feedstock and heavy metal sinkCharacteristic features of the snail shell-derived catalyst: a image of the just-precipitated material after crushing to powder (left) and the calcined precipitate or catalyst (taken by TECNO Pouvoir 3 Plus), b SEM image of the catalyst, c TEM image of the catalyst, and d XRD spectrum of the catalystBack to article page