Navegando por Autor "Sallet, Daniela"
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Artigo Synthesis of porous zinc aluminate spinel (ZnAl2O4) by metal-chitosan complexation method(Elsevier, 2014-03-05) Chiavone Filho, Osvaldo; Stringhini, Fabiane Marconato; Foletto, Edson Luiz; Sallet, Daniela; Bertuol, Daniel Assumpção; Nascimento, Claudio Augusto Oller doZinc aluminate (ZnAl2O4) particles with a spinel structure were prepared by metal-chitosan complexation method. The solids were obtained by the thermal decomposition of precursor compound of metallic hydroxides mixture and the biopolymer chitosan. X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and N2- adsorption–desorption isotherms were used for the characterization of the products. The results showed that the ZnAl2O4 spinel can be obtained by heating the precursor at temperatures above of 500 C, resulting in a material with porous structure and large surface area and high purityArtigo Synthesis of ternary zinc spinel oxides and their applicationin the photodegradation of organic pollutant(Elsevier, 2014-04) Chiavone Filho, Osvaldo; Anchieta, Chayene Gonçalves; Sallet, Daniela; Foletto, Edson Luiz; Silva, Syllos Santos da; Nascimento, Cláudio Augusto Oller doTernary zinc spinel oxides such as Zn2SnO4, ZnAl2O4and ZnFe2O4were synthesized and characterized, and their activities in thephotodegradation of phenol molecules were investigated. Zn2SnO4, ZnAl2O4and ZnFe2O4powders were synthesized by hydrothermal, metal–chitosan complexation and solvothermal routes, respectively. The face-centered cubic spinel structure of each material was confirmed by powderX-ray diffractometry (XRD) and its porous structure by N2adsorption–desorption isotherms. The characterization of spinels was complementedwith Fourier transform infrared spectroscopy (FTIR) and X-raysfluorescence (XRF), revealing the formation of spinel structures with high purity.The photocatalytic activity in the degradation of phenol was observed only with Zn2SnO4oxide. Mineralization degree of phenol molecules byZn2SnO4photocatalyst determined by total organic carbon analysis (TOC) reached 80% at 360 min under sunlight.&2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved