Study on the adsorption of Cd(II) in aqueous solution onto biochar materials synthesized from rice husk via microwave-assisted pyrolysis method. Vietnam j. catal. adsorp. [Internet]. 2025 Jun. 30 [cited 2026 Jul. 26];14(2):63-70. Available from: https://jca.edu.vn/index.php/jca/article/view/2025.017