In situ crystallization of ZnAl₂O₄/ZnO nanocomposite on alumina granule for photocatalytic purification of wastewater

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• 作者：Mozhgan Shahmirzaee ; Mahdi Shafiee Afarani…
• 关键词：Nanostructure ; Sintering ; Microwave ; Photocatalyst
• 刊名：Research on Chemical Intermediates
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：321-340
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry;
• 出版者：Springer Netherlands
• ISSN：1568-5675
• 卷排序：43

文摘

ZnAl₂O₄/ZnO nanocomposites with different ZnO (20, 30, and 40 mol%) concentrations and coated samples on supports were successfully prepared through combustion synthesis assisted by microwave. Two catalyst supports (α-Al₂O₃ granules and γ-Al₂O₃ granules) in the forming of granules were used by sintering. The obtained products after calcination were characterized by X-ray diffraction (XRD), electron microscopy (SEM and TEM), Brunauer–Emmett–Teller (BET), dynamic light scattering (DLS), photoluminescence spectroscopy (PL), and UV–Vis spectroscopy. Samples were studied by degradation of methyl orange (MO) under UV irradiation in a photoreactor to evaluate the photocatalytic performance. Degradation using a ZnAl₂O₄/ZnO (30 mol%) nanocomposite reached 97.1 %. γ-Al₂O₃ granules have demonstrated considerable difference in photocatalytic efficiency compared to α-Al₂O₃ granules. Therefore, the coated granules were able to be employed for the removal of dyes from wastewater, having desirable repeatability and reusability. Our results may initiate large-scale production of coated layers with promising photocatalytic performances.