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Influence of Sugarcane Bagasse Fiber Size on Biodegradable Composites of Thermoplastic Starch

Journal of Renewable Materials 2018年第2期6卷 176-182页

作者： Bruno Henrique dos Santos Karen de Souza do Prado Asaph Armando Jacinto marcia aparecida da silva spinace Federal University of ABC Center of Natural and Human SciencesAv.dos Estados5001Santa Terezinha09.210-170 Santo AndréSão PauloBrazil

Although thermoplastic starch(TPS)is biodegradable,its low mechanical resistance limits its wide *** bagasse(SB)fibers can be used as reinforcement in TPS matrix composites,but the influence of fiber size on the properties of the composite is still *** this study,TPS composites reinforced with SB short fibers of four sizes were processed and characterized in order to analyze the influence of fiber size on the mechanical properties of the TPS/SB *** was observed that the interaction between fiber and matrix was good and optimized when the fibers are sifted in sieves between 30 and 50 mesh,obtaining fibers with average length of 1569±640μm and average diameter of 646±166μ*** these composites,increases of more than 660%in the modulus and more than 100%in the maximum tension were verified when compared to the pure TPS.

关键词： Sugarcane bagasse thermoplastic starch composite fiber size

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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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