Autor(es)

Lanfredi, Silvania ^[1] ; Nobre, Marcos A. L. ^[2] ; Poon, Po S. ^[3] ; Matos, Juan ^{[3, 4]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, UNESP, Sch Technol & Sci, Lab Composites & Ceram Funct, Dept Chem & Biochem, BR-19000000 Presidente Prudente - Brazil

^[2] Sao Paulo State Univ, UNESP, Sch Technol & Sci, Dept Phys, BR-19000000 Presidente Prudente - Brazil

^[3] Univ Concepcion, Technol Dev Unit UDT, Concepcion 4070386 - Chile

^[4] Millennium Nuclei Catalyt Proc Sustainable Chem C, Santiago 7820436 - Chile

• Tipo de documento: Artigo Científico
• Fonte: Molecules; v. 25, n. 1 JAN 2020.
• Citações Web of Science: 0

Resumo

Innovative composites based on an amorphous-carbon matrix containing a second phase ZnO oxide and/or highly dispersed Zn metallic were synthesized via a modified Pechini route, in which a partial pyrolysis method was reached. Studies of adsorption in the dark and the photocatalytic activity for the cationic azo-dye, basic blue 41, and degradation were carried out. X-ray diffraction patterns for the carbon matrix and its composite with Zn show characteristics of the amorphous carbon. The infrared in the mid region of the composite prepared with ZnO and Zn exhibit vibrational bands related to bonds zinc oxide. The surface pH of the material is the main factor responsible for the adsorption of the azo-dye, but the contribution of mesopores favored the diffusion of molecules from the bulk of solution to the pore framework. Esters-like functional groups on the surface of carbons hinder the adsorption of the azo-dye. When Zn is embedded within amorphous carbon the photocatalytic activity of the composites showed up to 2.4 higher than neat ZnO. The enhancement in the photocatalytic activity and stability of C/ZnO/Zn and C/Zn composites is discussed in terms of a protector effect by the carbon layers inserted in composites. Carbon layers are responsible to inhibit the lixiviation of ZnO particles along irradiation. (AU)

• Processo FAPESP: 07/03510-9 - Caracterizacao estrutural de nanopos de oxidos semicondutores ferroeletricos.
• Beneficiário: Silvania Lanfredi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 02/05997-9 - Ceramicas e filmes dieletricos de oxidos semicondutores ferroeletricos nanoestruturados da familia tetragonal tungstenio bronze: processamento, caracterizacao e propriedades.
• Beneficiário: Marcos Augusto de Lima Nobre
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 14/11189-0 - Desempenho Catalítico em Função da Nanoestruturação de Novos Catalisadores Óxidos a Partir do Método de Spray Pirólise
• Beneficiário: Silvania Lanfredi
• Modalidade de apoio: Auxílio à Pesquisa - Regular