Removal of ion Cu2+ and Pb2+ using zeolite NaP1 with the silica source utilized from rice husk ash. Vietnam j. catal. adsorp. [Internet]. 2024 Mar. 30 [cited 2026 Jul. 27];13(1):51-6. Available from: https://jca.edu.vn/index.php/jca/article/view/2024.008