Mustofa Ahda, Sutarno, and Eko Sri Kunarti , trans. 2020. “Influence of Alumina Incorporated on MCM 41 Surface ForMesoporous Characteristic and Methylene Blue Adsorption”. Pakistan Journal of Analytical & Environmental Chemistry 21 (1): 87 – 91. https://doi.org/10.21743/pjaec/2020.06.10.