Hydrothermal synthesis and physicochemical characterization of CuO/ZnO/Al2O3 nanopowder. Part I: Effect of crystallization time |
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| Authors: | Saeed Saedy Mohammad Haghighi Mahsa Amirkhosrow |
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| Institution: | 1. Chemical Engineering Department, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;2. Reactor and Catalysis Research Center, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran |
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| Abstract: | A hydrothermal method was successfully used for synthesis of CuO/ZnO/Al2O3 (CZA) nanopowder with atomic ratio of 6:3:1. The effect of crystallization time (3, 6, 9, and 12 h) on physicochemical properties of nanopowder was investigated. Nanopowders were characterized using XRD, FESEM, EDX, FTIR, TG, and BET techniques. The XRD patterns confirmed metal oxides formation and their good crystallinity with average crystallite size of 20 nm as obtained by the Scherrer equation. Relative crystallinity was shown to increase with increasing crystallization time. In agreement with XRD results, FESEM images also illustrated nanosized particles. EDX mapping indicated homogenous dispersion of elements. BET specific surface area analysis showed acceptable surface area for CZA nanopowder. FTIR spectroscopy confirmed metal oxides formation during hydrothermal and calcination processing. TG results illustrated high thermal stability of the synthesized nanopowders. TG-DTG and FTIR analyses were used to propose a reaction mechanism for nanopowder formation during processing. Physicochemical characterization showed optimal crystallization time to be 6 h. |
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