“…2 The agro-industrial wastes are generally either burnt or left to landfill areas 3 that result in environmental problems such as air, soil, and water pollution. 4 In an effort to protect the environment through the rising farming activities, researchers have explored the feasibility of evaluating agricultural wastes and by-products in production of several materials such as composite materials, [5][6][7][8] adsorbents, [9][10][11] fillers, 12,13 supplementary cementitious materials, 14,15 and also silica-based materials. [16][17][18][19][20][21] Various agricultural wastes such bagasse husk, 22 barley husk, 23 and rice husk 24,25 have been utilized as a low-cost, surplus silica sources around the world.…”