Synthesis of a Sorbent via Chemical Modification of Lignin with Urea. INTERNATIONAL CONFERENCE ON ADVANCE SCIENCE AND TECHNOLOGY, [S. l.], v. 3, n. 5, p. 150–153, 2026. Disponível em: https://universalconference.us/index.php/icast/article/view/7949. Acesso em: 31 oct. 2026.