Adsorption of methylene blue in aqueous solution by adsorbent fabricating through activation of red mud with rice husk char. Vietnam j. catal. adsorp. [Internet]. 2022 Jan. 30 [cited 2026 May 31];10(1S):287-92. Available from: https://jca.edu.vn/index.php/jca/article/view/2021.148