Synthesis of gamma alumina (γ-Al2O3) from waste aluminium foil and its application in adsorptive removal of Malachite Green (MG) Dye from wastewater

Abstract

This study explores the sustainable synthesis of gamma alumina from waste aluminium foil and its efficacy in separating Malachite Green (MG) dye from water-based solutions. The synthesis process involves the transformation of waste aluminium foil into gamma alumina through a controlled procedure using Hydro Chloric Acid and Sulfuric Acid. The structural and morphological properties of the obtained γ-Al2O3 are characterized using BET, FTIR, FESEM, and XRD. The γ-Al2O3 is then employed as an adsorbent to remove MG dye from aqueous solutions by varying temperature, agitation speed, pH, and initial dye concentration. The results reveal that the optimal conditions for maximum MG dye removal are achieved at pH 8, with a removal efficiency of approximately 90% after 3 hours, using a 30 ppm dye solution, 130rpm agitation speed, and a 1.5g/L adsorbent dose. The adsorbent is re-used for 6 times. Kinetic studies are conducted to understand the adsorption behavior over time, providing insights into the mechanism and rate of the removal process. The findings contribute to the development of eco-friendly and cost-effective solutions for wastewater treatment, utilizing recycled materials for environmental remediation.