Adsorption of 4-Nitrophenol Using Pilli Nut Shell Active Carbon. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 18, n. 1, p. 69 – 83, 2017. DOI: 10.21743/pjaec/2017.06.07. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/225. Acesso em: 6 jul. 2025.