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

Autor(es)

Nogueira, Andre E. ^[1] ; Giroto, Amanda S. ^{[1, 2]} ; Neto, Arquiminio B. S. ^{[1, 3]} ; Ribeiro, Caue ^[1]

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

• 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: 13/11821-5 - Estudo da Solubilização de Fosfatos Nanométricos dispersos em Matrizes de diferentes solubilidades
• Beneficiário: Amanda Soares Giroto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• 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
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado