Petrović, Jana, et al. “The Effect of Sulfuric Acid Treatment on Physicochemical Properties of G-C3N4 and Its Efficiency for Photocatalytic Reduction of Cr(VI): Abstract”. HEMIJSKA INDUSTRIJA (Chemical Industry), vol. 78, no. 1S, Mar. 2024, p. 71, https://www.ache-pub.org.rs/index.php/HemInd/article/view/1318.