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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Efficient Cr(VI) removal from wastewater by activated carbon superparamagnetic composites

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Autor(es):
Nogueira, Helton P. [1] ; Toma, Sergio H. [1] ; Silveira, Alceu T. [1] ; Carvalho, Alexandrina A. C. [1] ; Fioroto, Alexandre M. [1] ; Araki, Koiti [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Microchemical Journal; v. 149, SEP 2019.
Citações Web of Science: 0
Resumo

Activated carbon decorated with superparamagnetic iron oxide nanoparticles, AC/SPION, with high efficiency for removal of Cr(VI) from aqueous media in pH 3 to 8 range was realized, by exploiting the adsorption and reducing capability of AC and magnetite nanoparticles, allied to magnetic separation. However, iron(II) species was demonstrated to be very interesting as co-adsorbent since broaden the optimal pH range (pH 4 to 10) and enhance the removal capacity more than four times, by reducing hexavalent chromium to Cr(III) at the same time that produce iron(III) hydroxide, a colloidal material that tend to precipitate on the nanocomposite increasing its adsorption properties. Finally, AC/SPION can be dispersed in water maximizing the efficiency, and the chromium species loaded material can be easily separated with a magnet providing an alternative for the treatment of large volumes of contaminated wastewater. In fact, final effluents with Cr concentrations in the low mu g/L range, suitable for direct disposal according to EPA recommendations, can be produced by the iron(II) assisted process demonstrating its potentiality in real applications. (AU)

Processo FAPESP: 13/24725-4 - Química supramolecular e nanotecnologia
Beneficiário:Henrique Eisi Toma
Linha de fomento: Auxílio à Pesquisa - Temático