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

摘要

Fan-shaped SiO_2 nanowires modified SiO_2@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 SiO_2 with SiO_2 acting as precursor and ZnCl_2 acting as molten salt and growth template.A large amount of fan-shaped SiO_2 nanowires with numerous tiny branches sprouting from the central nanowires were grown in the inter-porous epidermis and on the surface of rice husk SiO_2 for temperatures up to 1200 °C.The in situ ZnCl_2 molten salt template base-growth mechanism is responsible for the initial formation of SiO_2/ZnCl_2 co-melting nanowires and the subsequent growth of fan-shaped SiO_2 nanowires.The as-prepared samples have been successfully employed as organic absorbers with high efficiency in the field of wastewater treatment.