SYNTHESIS OF POROUS BOEHMITE NANOSTRUCTURES: EFFECTS OF TIME AND TEMPERATURE IN THE HYDROTHERMAL METHOD

• Published in: Ceramics (Praha) Vol. 59; no. 4; pp. 305 - 310
• Main Authors: Mozaffar Abdollahifar, Ali Reza Karami, Hagnnazari Nahid, Karami Changiz
• Format: Journal Article
• Language: English
• Published: University of Chemistry and Technology, Prague 01-01-2015
• Subjects: Boehmite; Hydrothermal processing; Mesopores; Nanostructures; Specific surface area
• ISSN: 0862-5468; 1804-5847

A hydrothermal approach has been employed for the synthesis of different morphologies of porous γ-AlOOH nanostructures using Al(NO3)3 and urea as raw materials with urea/nitrate molar ratio of 2. The effect of time and temperature of hydrothermal reaction on the morphologies of synthesized γ-AlOOH were investigated. Samples subjected to different reaction durations from 6 h to 24 h and various temperatures were prepared. The samples were characterized by X-ray diffraction (XRD), transmission electronic microscopy (TEM), field emission scanning electron microscope (FESEM), Fourier transform infrared spectrometry (FTIR) and N2 adsorption/desorption. X-ray powder diffraction indicated that all samples were single-phase γ-AlOOH. Our results showed that a change in the synthesis conditions may lead to marked differences in the morphology of porous γ-AlOOH. The surface area of samples decreases with increasing of reaction temperature and decreasing time duration in hydrothermal route.