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SnO_(2) Dense Ceramic Microwave Sintered with Low Resistivity

Materials Sciences and Applications 2012年第5期3卷 272-280页

作者： leinig Antonio perazolli Gisane Gasparotto Natalia Jaomaci Miguel Ruiz Maria Aparecida Zaghete Bertochi Cesar Renato Foschini Ederson Carlos Aguiar Jose Arara Varela Interdisciplinary Laboratory of Electrochemistry and Ceramics—LIEC Institute of ChemistryPaulista State University“Julio Mesquita Filho”(UNESP)Sao PauloBrasil

The Hall-Héroult process is used for alumina reduction by the use of graphite anodes even though it involves a high emission of carbon dioxide (CO2) and several other organic compounds. Proposals have been made aiming at substituting graphite for a single-phase SnO2-based ceramic with low resistivity and chemical resistance to cryolite, which is characterized as an inconsumable anode, reducing pollutant emissions. To this end, a wide range of studies were carried out on SnO2-based ceramics modified with ZnO as a densification aid doped with the promoters of electrical conductivity such as Nb2O5, Al2O3 and Sb2O3 through a mixture of oxides and hybrid sintering in a microwave oven. The pressed pellets were sintered in a microwave oven up to 1050℃ under a constant heating rate of 10℃/min. After sintering, the density was determined by the Archimedes method, the phases were then characterized by X-ray diffraction, the microstructure and chemical composition resulting from the sintered SnO2-based ceramics were also investigated by field emission scanning electron microscopy (FE-SEM) coupled with an energy-dispersive X-ray spectroscopy (EDS) and the electrical properties were determined by the measurements of the electric field x current density. A single-phase ceramic was obtained with a relative density of above 90% and electrical resistivity of 6.1 Ω·cm at room temperature. The ceramics obtained in this study could be a potential candidate as an inconsumable anode to replace the current fused coke used in the reduction of alumina.

关键词： Tin Oxide Anodic Electrode Inconsumable Anode Microwave Sintering Electrical Resistivity

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TiO_(2)/CuO Films Obtained by Citrate Precursor Method for Photocatalytic Application

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Materials Sciences and Applications 2011年第6期2卷 564-571页

作者： leinig perazolli Luciana Nunez Milady Renata Apolinario da Silva Guilherme Francisco Pegler Ademir Geraldo Cavalarri Costalonga Rossano Gimenes Marcia Matiko Kondo Maria Aparecida Zaghete Bertochi Microwave Sintering and Photocatalysis Laboratory Instituto de Quimica de AraraquaraUniv Estadual de Sao PauloAraraquaraBrazil UNIFEI-Federal University of Itajuba ItajubaBrazil

In the present work, the hybrid catalyst films of TiO2/CuO containing up to 10% in mol of copper were deposited onto glass surface. Precursor solutions were obtained by citrate precursor method. Films were porous and the average particle size was 20 nm determined by FEG-SEM analysis. The photocatalytic activities of these films were studied using Rhodamine B as a target compound in a fixed bed reactor developed in our laboratory and UV lamp. It was observed that the addition of copper to TiO2 increased significantly its photocatalytic activity during the oxidation of Rhodamine B. The degradation exceeded 90% within 48 hours of irradiation compared to 38% when pure TiO2 was used. Moreover, there was a reduction in the particles band gap energy when compared to that of pure TiO2. These results indicate that the TiO2/CuO films are promising catalysts for the development of fixed bed reactors to be used to treat effluents containing azo dyes.

关键词： TiO_(2)/CuO Citrate Precursor Method Thin Film Rhodamine B Photocatalytic Oxidation

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