Institute for Energy and Environmental Technology Jomo Kenyatta University of Agriculture and Technology Nairobi 62000-00200 Kenya;
Department of Physics Jomo Kenyatta University of Agriculture and Technology Nairobi 62000-00200 Kenya;
Chemistry Department Jomo Kenyatta University of Agriculture and Technology Nairobi 62000-00200 Kenya;
Rice; husk; conversion; silica; gel; synthesis; green; chemistry; ideal; conditions;