ISSN 2630-0583 (Print)
ISSN 2630-0656 (Online)
Journal of Current Science and Technology
Journal of Current Science and Technology. Vol.9 No.1 , January - June 2019.
Applications of response surface methodology for optimization of y-alumina nanoparticles synthesis and acid dye adsorption
Gamma alumina (y-alumina) nanoparticles were synthesized successfully by the calcination of aluminum hydroxide obtained from aluminum scrap using the control precipitation method. The effective parameters, including solution pH, temperature and time of aging, were optimized by response surface methodology (RSM) based on a central composite design to obtain g-alumina nanoparticles with a high-surface area. The optimum conditions for g-alumina synthesis were pH 6.5 with an aging temperature of 75 °C, an aging time of 8 h, and subsequent calcination at 550 °C. The synthetic material was characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and the N2 adsorption–desorption technique. The results showed that the g-alumina nanoparticles had an average particle size of 21.18 nm, and a BET surface area of 283 m2/g was obtained from inexpensive raw materials. The synthetic g-alumina was examined for the adsorption of acid dye from aqueous solution and the isotherms were determined. RSM was also applied to evaluate the effect of experimental variables and their interaction in achieving the optimum conditions for acid dye removal. The adsorption behavior of acid yellow on g-alumina nanoparticles was well explained by Langmuir isotherm model. The maximum adsorption capacity for the removal of acid yellow was found to be 125 mg/g.