In situ Formed Fan-Shaped Nanowires in Biomorphic SiO₂: A Multidimensional Composite of Hierarchical Porous Material and Organic Pollutant Adsorption Behavior

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• 作者：Hui Chen ; Lei Zhao ; Xuan He ; Guang-Hui Wang…
• 关键词：Agricultural waste ; Fan ; shaped SiO2 nanowires ; Rice husk ; Biomorphic porous SiO2 ; Waste water
• 刊名：Acta Metallurgica Sinica (English Letters)
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：2
• 页码：104-112
• 全文大小：
• 刊物主题：Metallic Materials; Spectroscopy/Spectrometry; Organometallic Chemistry; Tribology, Corrosion and Coatings; Nanotechnology; Characterization and Evaluation of Materials;
• 出版者：The Chinese Society for Metals
• ISSN：2194-1289
• 卷排序：30

文摘

Fan-shaped SiO₂ nanowires modified SiO₂@C composites with a bio-inspired hierarchical porous structure and a high accessible surface area were prepared by in situ molten salt template method. The combination of biogenic hierarchical porous structure and one-dimensional nanostructure with similar features was successfully obtained by one-pot heat treatment in the presence of rice husk SiO₂ with SiO₂ acting as precursor and ZnCl₂ acting as molten salt and growth template. A large amount of fan-shaped SiO₂ nanowires with numerous tiny branches sprouting from the central nanowires were grown in the inter-porous epidermis and on the surface of rice husk SiO₂ for temperatures up to 1200 °C. The in situ ZnCl₂ molten salt template base-growth mechanism is responsible for the initial formation of SiO₂/ZnCl₂ co-melting nanowires and the subsequent growth of fan-shaped SiO₂ nanowires. The as-prepared samples have been successfully employed as organic absorbers with high efficiency in the field of wastewater treatment.