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首页> 外文期刊>Journal of the Brazilian Chemical Society >Synthesis and Characterization of Mesoporous Nb2O5 and Its Application for Photocatalytic Degradation of the Herbicide Methylviologen
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Synthesis and Characterization of Mesoporous Nb2O5 and Its Application for Photocatalytic Degradation of the Herbicide Methylviologen

机译：介孔Nb2O5的合成，表征及其在除草剂甲基紫精的光催化降解中的应用

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>This article reports the characterization of mesoporous Nb2O5 synthesized by the sol-gel method for application in photocatalysis. The emerging contaminant methylviologen was employed for photocatalytic tests. Parameters inherent to the synthesis process, such as stirring rate, aging temperature, and calcination temperature, were employed for a range of values to improve the synthetic route. The powders obtained were characterized by thermogravimetric analysis, X-ray diffraction, scanning and transmission electron microscopy, specific surface area, infrared spectroscopy, energy-dispersive spectroscopy, and diffuse reflectance spectroscopy. In samples calcined at 450 ?°C, a mixture of amorphous and hexagonal phases was observed, with a predominance of the former, while in samples calcined at 650 ?°C the orthorhombic phase predominated. Samples calcined at 450 ?°C exhibited larger specific surface areas. Mesoporous structures were confirmed for samples T8035M450 and T8045mi450, which displayed higher photoactivity, with roughly 90% removal of methylviologen.
机译：>本文报道了通过溶胶-凝胶法合成的中孔Nb2O5的表征，并将其应用于光催化。出现的污染物甲基紫罗兰被用于光催化测试。合成过程中固有的参数，例如搅拌速率，老化温度和煅烧温度，被用于一系列值，以改善合成路线。通过热重分析，X射线衍射，扫描和透射电子显微镜，比表面积，红外光谱，能量色散光谱和漫反射光谱来表征获得的粉末。在450°C煅烧的样品中，观察到非晶相和六方相的混合物，其中前者占优势，而在650°C煅烧的样品中，正交相占主导。在450°C下煅烧的样品具有较大的比表面积。样品T8035M450和T8045mi450的介孔结构得到确认，它们显示出较高的光活性，甲基紫罗兰素的去除率约为90％。

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