Usman, A.; Saidu, U.; Ibrahim, Y.; Musa Aminu, A. Effect of Calcination Temperature on the Structural, Optical, and Photocatalytic Properties of Urea-Derived G-C3N4 for Methylene Blue Degradation. FJS 2026, 10 (14), 132-138. https://doi.org/10.33003/fjs-2026-1014-5722.