Adsorption of Ni(II), Pb(II) and Zn(II) on Ca(NO3)(2)-Neutralised Red Mud

Autor(es)

Pichinelli, Beatriz Cestaro ; Gabriel da Silva, Mariana Scicia ; da Conceicao, Fabiano Tomazini ; Menegario, Amauri Antonio ; Pereira Antunes, Maria Lucia ; Beltran Navarro, Guillermo Rafael ; Moruzzi, Rodrigo Braga

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 228, n. 1 JAN 2017.
• Citações Web of Science: 1

Resumo

This study aimed to investigate a novel method of red mud neutralisation by Ca(NO3)(2) (NRM), keeping its adsorption capacity in relation to natural red mud (RM) for Ni(II), Pb(II) and Zn(II). Results pointed out that the neutralisation process decreases the pH and electrical conductivity values on NRM due to reaction between the carbonate and bicarbonate alkalinity of red mud and calcium from calcium nitrate to form calcite (CaCO3). The maximum adsorption capacity values of RMand NRM, respectively, were 1.78 and 1.79 mmol g(-1) for Ni(II), 2.13 and 2.23 mmol g(-1) for Pb(II) and 1.14 and 1.06 mmol g(-1) for Zn(II). Pseudosecond-order model is the main responsible for the adsorption of these metals on RM and NRM. The adsorption reaction is endothermic and these metals have affinity to RM and NRM. Thus, it is possible to neutralise the red mud with Ca(NO3)(2) without adsorption capacity losses of Ni(II), Pb(II) and Zn(II). (AU)

• Processo FAPESP: 09/02374-0 - Caracterização da lama vermelha brasileira e avaliação de seu potencial para a adsorção de corantes têxteis
• Beneficiário: Maria Lúcia Pereira Antunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/00994-6 - Estudo da influência do pH e cinética de reação da adsorção de Ni e Zn pela lama vermelha, subproduto da indústria do alumínio
• Beneficiário: Beatriz Cestaro Pichinelli
• Modalidade de apoio: Bolsas no Brasil - Mestrado