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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Photocatalytic activity of nanoparticle gold/iron oxide aerogels for azo dye degradation
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Photocatalytic activity of nanoparticle gold/iron oxide aerogels for azo dye degradation

机译：纳米金/氧化铁气凝胶对偶氮染料降解的光催化活性

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摘要

Nanoparticle gold/iron oxide (maghemite) aerogels were used as photocatalysts to degrade Disperse Blue 79 azo dye in water under ultraviolet light illumination. They were characterized by diffuse reflection spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. Addition of gold species caused the light absorption to shift towards the red visible region, and thus the band gap energy reduced. Photocatalytic activity enhanced with increasing An loading up to 8 wt%, and the activity increase was dependent upon catalyst pretreatment. The dye degradation was accelerated remarkably when carried out in alkaline media or in the presence of hydrogen peroxide. In the photocatalysis system, metallic gold particles serve to facilitate the transfer of surface electrons, and hydroxyl radicals near the catalyst surface act as the main oxidative species to attack dye molecules. At high catalyst concentrations, the use of ultrasound and light irradiation improved the activity declined by catalyst particle aggregation. Results demonstrate the feasibility of aerogel powders as a model photocatalyst for dye decontamination in textile wastewater. (C) 2007 Elsevier B.V. All rights reserved.
机译：纳米金/氧化铁（磁赤铁矿）气凝胶被用作光催化剂，以在紫外线照射下降解水中的分散蓝79偶氮染料。它们的特征在于漫反射光谱（DRS），X射线衍射（XRD），X射线光电子能谱（XPS）和扫描电子显微镜。添加金物质会导致光吸收移向红色可见区域，因此带隙能量降低。随负载量增加至8 wt％，光催化活性增强，该活性的提高取决于催化剂的预处理。当在碱性介质中或在过氧化氢存在下进行时，染料降解显着加速。在光催化系统中，金属金颗粒用于促进表面电子的转移，催化剂表面附近的羟基自由基是攻击染料分子的主要氧化物质。在高催化剂浓度下，超声和光辐射的使用改善了由于催化剂颗粒聚集而降低的活性。结果表明气凝胶粉作为纺织废水中染料去污的模型光催化剂的可行性。 （C）2007 Elsevier B.V.保留所有权利。

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