Novel synthesis and characterization of nanosized γ-Al2O3 from kaolin |
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| Affiliation: | 1. Department of Chemical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh 31750, Perak, Malaysia;2. Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad;3. Interdisciplinary Research Centre in Biomedical materials, COMSATS Institute of Information Technology, Lahore, Pakistan;1. DST/CSIR Nanotechnology Innovation Centre, National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa;2. Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India;1. School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, Queensland, Australia;2. School of Chemistry and Physics, Faculty of Science, Queensland University of Technology (QUT), Brisbane, Queensland, Australia;1. Mineral Processing Research Center, Chemical Engineering Department, Sahand University of Technology, Tabriz, Iran;2. Center of Excellence for Color Science and Technology, Tehran, Iran;3. Faculty of Chemical Engineering, Urmia University of Technology, Urmia, Iran |
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| Abstract: | This paper reports the synthesis of nanosized γ-Al2O3 from acid-leachates of calcined kaolin. Al (hydr)oxide was precipitated with ammonia from the leachate in the presence of polyethylene glycol. A white powder of nanosized γ-Al2O3 particles was obtained after calcination. X-ray diffraction (XRD), different scanning calorimetries and thermogravimetry (DSC-TG), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and magic angle spinning nuclear magnetic resonance (MAS NMR) were used to characterize the samples. Typical nanosized γ-Al2O3 particles showed rod-like morphology with width of about 7 nm and length of approximately 20 nm. A possible mechanism from kaolin to nanosized γ-Al2O3 is proposed. |
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