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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.)

CuO synthesized by solvothermal method as a high capacity adsorbent for hexavalent chromium

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Autor(es):
Nogueira, Andre E. [1] ; Giroto, Amanda S. [1, 2] ; Neto, Arquiminio B. S. [1, 3] ; Ribeiro, Caue [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Embrapa Instrumentat, Rua 15 Novembro 1452, CP 741, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, Via Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Mat Engn, Via Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 498, p. 161-167, JUN 5 2016.
Citações Web of Science: 12
Resumo

The ability of copper oxide synthesized by three different methods (solvothermal, precipitation method, and precursor calcination) for the adsorption of hexavalent chromium (Cr(VI)) ions from aqueous solutions was investigated, highlighting adsorption capacity dependence on specific synthesis conditions. Copper oxide nanoparticles with monoclinic phase and high specific surface areas (around 120 m(2) g(-1)) were successfully synthesized by solvothermal and precipitation method. Studies on Cr(VI) adsorption capacity of the synthesized materials were conducted at different temperatures, pH, time, and initial Cr(VI) solution concentration. The results revealed a key role of acetate groups bound to CuO surface in Cr(VI) adsorption. These groups were preserved during solvothermal synthesis, while they were partially volatilized by the precipitation method and completely eliminated with precursor calcination. Thermodynamic analysis of the adsorption data confirmed a physisorption behavior, which is consistent with the proposed complexing role of acetate groups. The correlation coefficient for each isotherm-model (Langmuir, Freundlich and Temkin) showed that the equilibrium adsorption behavior of Cr(VI) is adjusted to the Langmuir model with a maximum adsorption capacity of 245 mg g(-1) at 25 degrees C. (C) 2016 Published by Elsevier B.V. (AU)

Processo FAPESP: 14/09014-7 - Estudo do potencial de nano-heteroestruturas de óxidos de cobre e nióbio para aplicação em fotossíntese artificial
Beneficiário:André Esteves Nogueira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/11821-5 - Estudo da solubilização de fosfatos nanométricos dispersos em matrizes de diferentes solubilidades
Beneficiário:Amanda Soares Giroto
Linha de fomento: Bolsas no Brasil - Doutorado