http://www.sciepub.com/journal/AJIE American Journal of Industrial Engineering is a peer-reviewed, open access journal that provides rapid publication of articles in all areas of Industrial Engineering. The aim of the journal is to provide academicians, researchers and professionals a platform to share cutting-edge development in the field of Industrial Engineering. Science and Education Publishing en 2013 Science and Education Publishing Co. Ltd All rights reserved. American Journal of Industrial Engineering 9 1 January 2025 2013 Science and Education Publishing Co. Ltd All rights reserved. http://pubs.sciepub.com/ajie/9/1/1 γ-Al₂O₃ (gamma-Nano alumina) have been done in the present work. Batch tests were carried out varying some processing parameters namely initial dye concentration (5 - 50 mg/L), adsorbent dose (0.5 - 5 g/L), initial pH (1 - 12) and contact time (0 - 30 min). Under conditions of C₀ = 50 mg/L; pH = 11; dose = 1g/L and t = 15 min, more than 83.6% of the BB9 molecules were removed corresponding to an adsorption capacity of 41.8 mg/g. The pseudo-second order and the Langmuir models fit well the experimental data with highest R² values of 0.99 and 0.91 respectively and lowest values of χ². This suggests adsorption process as limiting step on a homogeneous distribution of active sites on the adsorbent surface. The first step of adsorption mechanism involved electrostatic interactions between the negatively charged γ-Al₂O₃ surface in basic medium and secondly electrophilic-nucleophilic interactions. Compared to other adsorbents, γ-nano Al₂O₃ obtained in this work could be a good alternative for treatment water containing dye BB9.]]> Gustave Tchanang, Jean M. Kepdieu, Kalaya Goumou, Mamadou Y. Baldé, Cyprien J. Ekani, Chantale N. Djangang, Phillipe Blanchart 2025-06-25 Science and Education Publishing 2025-06-25 1 9 1 7 10.12691/ajie-9-1-1