Adsorption of Mn(II) ions from wastewater using activated carbon obtained from Birbira (Militia ferruginea) leaves. GJSFR [Internet]. 2012 Jan. 15 [cited 2026 Feb. 6];12(B1):5-12. Available from: https://www.journalofscience.org/index.php/GJSFR/article/view/100147