Document Type : Regular Article
Department of Chemistry, Faculty of Sciences, Kano University of Science and Technology Wudil, PMB 3244, Kano State, Nigeria
Nanoparticles materials with good structural properties can serve as an excellent candidate for the remediation of wastewater. In this study, mesoporous gamma-alumina was synthesized from kaolin using polyoxyethylene (40) stearate (PS) surfactant. The XRD diffractogram of the alumina revealed broad peaks that signifies small crystallites, while the FTIR spectrum indicates that the alumina possessed both tetrahedral and octahedral structure. The surface area, average pore diameter, and pore volume obtained from the N2-sorption study are respectively 76.0 m2/g, 4.4 nm, and 0.14 cm3/g. The XRF result revealed up to 98% Al2O3 composition, indicating a very high purity of the alumina. The alumina (Nano-Al) was applied for the adsorption of Eriochrome Black T dye, and the process optimized using RSM analysis by Box-Behnken Design (BBD) model. From the optimization results, the model's R2 (0.8736) value implies 87.36% on the percent dye removal could be due to the variation in the independent variable. While the F-value of 7.68 implies the model is significant. Consequently, 98.2% dye removal was achieved under the optimum conditions. This may be attributed to the enhanced structural properties of the Nano-Al. The experimental data were fitted to Langmuir isotherm, and the adsorption kinetics data were fitted to pseudo-second-order model.