Coconut Shell Biochar for Removal of Cu(II) from Aqueous Solution. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 21, n. 2, p. 280 – 292, 2020. DOI: 10.21743/pjaec/2020.12.30. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/146. Acesso em: 12 jul. 2025.