Preparation of Flower-like ZnO Hierarchical Nanostructures for Photodegradation of Phenol under a Compact Fluorescent Lamp
Current Environmental Engineering,
Sin JC, Lam SM, Lee KT and Mohamed ARAffiliation:
School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
AbstractThis paper reports the synthesis of flower-like ZnO hierarchical nanostructures via a simple and economical citric acid-mediated hydrothermal route. The synthesized ZnO hierarchical nanostructures were characterized in detail by FESEM, EDX, XRD, UV-Vis, FTIR and Raman analyses. The observation of FESEM showed that the obtained flower-like ZnO were self-assembled by large amounts of interleaving nanosheets with an average thickness of about 88 nm. The XRD, FTIR and Raman results showed that as-synthesized ZnO products were well-crystalline and possessed wurtzite structure. By utilizing the flower-like ZnO hierarchical nanostructures as photocatalysts, considerable photocatalytic degradation was observed towards phenol in the presence of a compact fluorescent lamp. The degradation of phenol was further confirmed by the formation of intermediate products in the HPLC data and decrease of total organic carbon (TOC) concentration. The flower-like ZnO was also reused for several times and without considerable loss of activity. These characteristics showed the practical applications of the flower-like ZnO hierarchical nanostructures in environmental remediation.
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