Evaluation of Rice Husk Biochar Modified with Magnesium Oxide in Adsorbing Heavy Metals from Tannery Wastewater. Environmental Technology & Science Journal, [S. l.], v. 17, n. 1, p. 191–200, 2026. Disponível em: https://journal.futminna.edu.ng/index.php/etsj/article/view/250.. Acesso em: 8 jun. 2026.