Influence of synthesis parameters on the properties of nanostructured? -Alumina using plackett-burman experimental design
Article Type:
Research/Original Article (دارای رتبه معتبر)
Mesoporous nanostructured γ-Al2O3 powders were synthesized through multi- step precipitation procedures using the pH-swing technique. Structural and morphological characteristics in addition to the thermal behavior of the procured samples were characterized via X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), fourier transform infrared (FT-IR) spectroscopy, thermogravimetry-derivative thermal gravimetric (TG-DTG) and N2 adsorption–desorption isotherm. Plackett-Burman design was implemented as a screening method to examine the impacts of fifteen variables on physical properties of synthesized γ-Al2O3 as a response variable. Specific surface area, pore volume and average pore diameter of the prepared samples were found to be within the ranges of 72-335.7 m2/g, 0.26-1.03 cm2/g and 4.6-15.2 nm, respectively. It was determined that the variables including pH value on the acidic region, time in the alkaline region and number of pH-swing frequencies had major effects on the pore diameter of the procured γ-Al2O3 powders. Calcination by steaming had the most significant effect on specific surface area, while the pH value on the acidic region had the greatest impact on pore volume.
International Journal of Nano Dimension, Volume:9 Issue: 4, Autumn 2018
386 to 397  
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