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  • Coherent-Interface-Assembled Ag2O-Anchored Nanofibrillated Cellulose Porous Aerogels for Radioactive Iodine Capture

    Author(s)
    Lu, Yun
    Liu, Hongwei
    Gao, Runan
    Xiao, Shaoliang
    Zhang, Ming
    Yin, Yafang
    Wang, Siqun
    Li, Jian
    Yang, Dongjiang
    Griffith University Author(s)
    Yang, Dongjiang
    Year published
    2016
    Metadata
    Show full item record
    Abstract
    Nanofibrillated cellulose (NFC) has received increasing attention in science and technology because of not only the availability of large amounts of cellulose in nature but also its unique structural and physical features. These high-aspect-ratio nanofibers have potential applications in water remediation and as a reinforcing scaffold in composites, coatings, and porous materials because of their fascinating properties. In this work, highly porous NFC aerogels were prepared based on tert-butanol freeze-drying of ultrasonically isolated bamboo NFC with 20–80 nm diameters. Then nonagglomerated 2–20-nm-diameter silver oxide ...
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    Nanofibrillated cellulose (NFC) has received increasing attention in science and technology because of not only the availability of large amounts of cellulose in nature but also its unique structural and physical features. These high-aspect-ratio nanofibers have potential applications in water remediation and as a reinforcing scaffold in composites, coatings, and porous materials because of their fascinating properties. In this work, highly porous NFC aerogels were prepared based on tert-butanol freeze-drying of ultrasonically isolated bamboo NFC with 20–80 nm diameters. Then nonagglomerated 2–20-nm-diameter silver oxide (Ag2O) nanoparticles (NPs) were grown firmly onto the NFC scaffold with a high loading content of ∼500 wt % to fabricate Ag2O@NFC organic–inorganic composite aerogels (Ag2O@NFC). For the first time, the coherent interface and interaction mechanism between the cellulose Iβ nanofiber and Ag2O NPs are explored by high-resolution transmission electron microscopy and 3D electron tomography. Specifically, a strong hydrogen between Ag2O and NFC makes them grow together firmly along a coherent interface, where good lattice matching between specific crystal planes of Ag2O and NFC results in very small interfacial straining. The resulting Ag2O@NFC aerogels take full advantage of the properties of the 3D organic aerogel framework and inorganic NPs, such as large surface area, interconnected porous structures, and supreme mechanical properties. They open up a wide horizon for functional practical usage, for example, as a flexible superefficient adsorbent to capture I– ions from contaminated water and trap I2 vapor for safe disposal, as presented in this work. The viable binding mode between many types of inorganic NPs and organic NFC established here highlights new ways to investigate cellulose-based functional nanocomposites.
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    Journal Title
    ACS Applied Materials and Interfaces
    Volume
    8
    Issue
    42
    DOI
    https://doi.org/10.1021/acsami.6b10749
    Subject
    Macromolecular and Materials Chemistry not elsewhere classified
    Chemical Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/101125
    Collection
    • Journal articles

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