Magnetized manganese oxide nanocomposite for effective decontamination of Cd(II) from wastewaters.

Autor: Heitmann AP; Department of Materials Engineering, Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Av. Amazonas, 5253, Nova Suíça, Belo Horizonte, Minas Gerais 30421-169, Brazil., Silva GC; National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil., Paiva PR; Department of Materials Engineering, Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Av. Amazonas, 5253, Nova Suíça, Belo Horizonte, Minas Gerais 30421-169, Brazil; National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil., Dantas MS; Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais 31270901, Brazil; National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil., Ciminelli VS; Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais (UFMG), Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais 31270901, Brazil; National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil., Souza Dinóla IC; Fundação Centro de Analise, Pesquisa e Inovação Tecnológica - FUCAPI - Gov. Danilo de Mattos Areosa, 381 - Distrito Industrial, Manaus, Amazonas CEP 69075-351, Brazil., Ferreira AM; Department of Chemistry, Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Av. Amazonas, 5253, Nova Suíça, Belo Horizonte, Minas Gerais 30421-169, Brazil E-mail: angelamello@des.cefetmg.br; National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil.
Jazyk: angličtina
Zdroj: Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2016 Dec; Vol. 74 (12), pp. 2762-2772.
DOI: 10.2166/wst.2016.446
Abstrakt: In this study, a composite with magnetic properties has been successfully synthesized by a novel and environmentally friendly route and is applied to Cd(II) adsorption for water decontamination. The quantification of the phases obtained by Rietveld refinement has shown the presence of 84% of Mn 3 O 4 and 16% of Fe 3 O 4 . Transmission electron microscopy image shows an aggregate of Mn 3 O 4 nanoparticles without specific orientation and the predominance of octahedral morphology with nanoparticles size estimated around 25-30 nm. The Cd(II) adsorption isotherm is fitted using the Langmuir-Freundlich model. The estimated maximum adsorption capacities of Cd(II) at pH 6 and 7 are similar (0.28 ± 0.02 and 0.31 ± 0.02 mg/m 2 , respectively). The kinetic results show that the studied system follows the pseudo-second-order model. The Raman results indicate that Cd is being specifically adsorbed by the Mn 3 O 4 in the composite. The hysteresis curve of the composite Mn 3 O 4 /Fe 3 O 4 has changed when compared to the pure magnetite; however, the coercive field after the addition of manganese oxide remains unaltered and does not change with a value around 158 Oe. The turbidity tests showed that the magnetic sedimentation was efficient and promising for wastewater treatment in large scale. These materials can be conveniently recovered by magnetic separation, avoiding the filtration steps, which will make easier the solid-liquid separation operation that follows the adsorption process.
Databáze: MEDLINE
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