azami, m.s., et al. “Microwave-Assisted in the Preparation of Nitrogen-Doped TiO2 for the Removal of Organic Dyes: Effect of PH and Catalyst Loading”. Malaysian Journal of Catalysis, vol. 6, no. 1, June 2022, pp. 20-24, doi:10.11113/mjcat.v6n1.156.