A Green and Facile Hydrothermal Synthesis of ZnO Nanorods for Photocatalytic Application-Juniper Online Journal Material Science-Juniper Publishers

JUNIPER PUBLISHERS-Juniper Online Journal Material Science

A Green and Facile Hydrothermal Synthesis of ZnO Nanorods for Photocatalytic Application

Authored by Sze-Mun Lam*

ZnO nanorods were prepared via a green and facile hydrothermal approach using ZnO powder and 30 vol% H₂O₂ aqueous solution. X-ray diffraction results revealed that the synthesized ZnO product was highly crystalline having hexagonal wurtzite structure. The band gap energy of ZnO nanorods was determined to be 3.28 eV using optical reflectance spectrum. The rod-like morphological features of ZnO nanostructures were observed from microscopy analyses. A possible formation mechanism was also proposed. The synthesized ZnO product showed an enhanced UV photocatalytic performance compared to that of commercial TiO₂ for the resorcinol degradation. There was an optimal photocatalyst amount of 1.0 g/L, at which the degradation efficiency of resorcinol was completely degraded under exposure of UV light for 120 min. The active hydroxyl (o OH) radicals formed during the photocatalytic process were tested using a photoluminescence-terephthalic acid (PL-TA) measurement, which were validate to be significantly affected by the photocatalyst amount. Other organic pollutants including phenol, bisphenol A and methylparaben could also be photodegraded in the presence of similar conditions. These features demonstrated the ZnO nanorods practical applications in environmental remediation.

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