Turning Waste into Wealth: Sustainable Amorphous Silica from Moroccan Oil Shale Ash. - Krime, Anas; Saoiabi, Sanaâ; Tlemcani, Mouhaydine; Saoiabi, Ahmed; Carreiro, Elisabete P.; Carrott, Manuela Ribeiro (Recycling (MDPI AG), 2025)