Green Synthesis of Zinc Oxide Nanoparticles Using Terminalia Catappa Leaf Extract and its Application in Phytoremediation of Some Polycyclic Aromatic Hydrocarbons in Contaminated Soil


  • A.F. Oluyinka-Edunro, B.M. Ogunsanwo and O.O. Adeyemi


Degradation, Pollutants, Metal oxide, Uptake


Green synthesis of nanoparticles has been embraced in the field of nanotechnology in recent times. This is because of its promising benefits over other chemical methods. In this study zinc oxide nanoparticles (ZnO NPs) were synthesised via a green-mediated route with Terminalia catappa (Almond) leaf extract, a plant rich in alkaloids and flavonoids. The biosynthesized zinc oxide nanoparticles were characterised using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray (EDX) and Fourier transform infrared microscopy (FTIR).  The XRD and electron microscopy both confirmed the hexagonal crystalline wurtzite structure of ZnO NPs with an average size of 28nm. The EDX result showed an elemental yield of 94.8 and 3.3% for Zn and O respectively. FTIR results indicate Zn-O stretching vibration at 460cm-1. Furthermore, this study evaluated the role of ZnO nanoparticles in the uptake and degradation of some polycyclic aromatic hydrocarbons (PAHs) in contaminated soil on which Panicum maximum Jacq. (Poaceae) and Aspilia africana Pers. (Asteraceae) plants grow. The uptakes of the PAHs in the two plants were quantified by Gas chromatography-mass spectroscopy. The percentage degradation of the investigated PAHs-anthracene, benzo[a]anthracene, benzo[k]flouranthene, chrysene and naphthalene in the soil of Panicum maximum were 56.5, 71.3, 39.7, 54.2 and 83.5% while in the soil of Aspilia Africana 60.9, 74.6, 45.8, 58.8 and 85.2% were obtained respectively. The results indicated that Naphthalene had the highest percentage of degradation. Therefore, as the concentration of the ZnO NPs increases, degradation of the polycyclic aromatic hydrocarbon increases.

Author Biography

A.F. Oluyinka-Edunro, B.M. Ogunsanwo and O.O. Adeyemi