Fig. 4From: Biosynthesis approach of zinc oxide nanoparticles for aqueous phosphorous removal: physicochemical properties and antibacterial activitiesUV–vis absorption (a), plots of (αhѵ)2 as a function of photon energy hʋ for a direct bandgap of ZnO NPs (b) and PL spectra of ZnO NPs showed the emission peaks at 428 nm (c)Back to article page