Removal of of Pb(II), Cd(II), Cu(II) and Ni(II) Ions from Aqueous Solution Using Pentaclethra Macrophylla Stem Activated Carbon. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 19, n. 2, p. 195 – 204, 2018. DOI: 10.21743/pjaec/2018.12.21. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/192. Acesso em: 7 jul. 2025.