Hamza, Abdulhamid, Abubakar Mashood Alao, and Mohammed Sani Galadima. “Adsorption of Chromium (VI) onto Metakaolin: Isotherms, Modelling and Optimization”. Journal of Science and Technology 11, no. 1 (June 20, 2019): 45-54. Accessed June 3, 2020. https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/4101.