Abstract

The challenges of resource scarcity and waste deposition have increased raw material costs and imposed stricter waste management regulations. This study presents the first attempt to utilize high oil-yielding Quercus incana seeds (55.77 wt%, 0.28 % FFA) as a novel waste feedstock for synthesizing a bio-fabricated Al2O3 nanocatalyst and its application in producing high-quality biodiesel. A maximum biodiesel yield of 97.6 % was achieved under optimal conditions, including a 1:9 oil-to-methanol ratio, a 120-minute reaction time at 70 °C, and 0.25 % catalyst concentration. The formation of biodiesel was confirmed through various analytical techniques, such as 1H- and 13C NMR, FTIR, and GC–MS. Additionally, the physicochemical properties of the biodiesel, including sulfur content (0.00047 wt%), TAC (0.20 mg KOH/g), cloud point, and pour point (?11 °C), were analyzed and compared to international biodiesel standards to ensure its stability, sustainability, and eco-friendliness. The production of biodiesel from Quercus incana, a non-edible, uncultivated waste feedstock, supports a greener revolution and a net-zero carbon society. It also promotes smarter waste management practices globally. © 2024 Elsevier Ltd