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Hierarchically porous, ultra-strong reduced graphene oxide-cellulose nanocrystal sponges for exceptional adsorption of water contaminants

Nanoscale, 2018-04, Vol.10 (15), p.7171 [Peer Reviewed Journal]

EISSN: 2040-3372 ;DOI: 10.1039/c7nr09037d ;PMID: 29620092

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  • Title:
    Hierarchically porous, ultra-strong reduced graphene oxide-cellulose nanocrystal sponges for exceptional adsorption of water contaminants
  • Author: Yousefi, Nariman ; Wong, Kerwin K W ; Hosseinidoust, Zeinab ; Sørensen, Henning Osholm ; Bruns, Stefan ; Zheng, Yi ; Tufenkji, Nathalie
  • Subjects: Adsorption ; Cellulose ; Graphite ; Nanoparticles ; Oxides ; Water ; Water Purification
  • Is Part Of: Nanoscale, 2018-04, Vol.10 (15), p.7171
  • Description: Self-assembly of graphene oxide (GO) nanosheets into porous 3D sponges is a promising approach to exploit their capacity to adsorb contaminants while facilitating the recovery of the nanosheets from treated water. Yet, forming mechanically robust sponges with suitable adsorption properties presents a significant challenge. Ultra-strong and highly porous 3D sponges are formed using GO, vitamin C (VC), and cellulose nanocrystals (CNCs) - natural nanorods isolated from wood pulp. CNCs provide a robust scaffold for the partially reduced GO (rGO) nanosheets resulting in an exceptionally stiff nanohybrid. The concentration of VC as a reducing agent plays a critical role in tailoring the pore architecture of the sponges. By using excess amounts of VC, a unique hierarchical pore structure is achieved, where VC grains act as soft templates for forming millimeter-sized pores, the walls of which are also porous and comprised of micron-sized pores. The unique hierarchical pore structure ensures the interconnectivity of pores even at the core of large sponges as evidenced by micro and nano X-ray computed tomography. The unique pore architecture translates into an exceptional specific surface area for adsorption of a wide range of contaminants, such as dyes, heavy metals, pharmaceuticals and cyanotoxin from water.
  • Publisher: England
  • Language: English
  • Identifier: EISSN: 2040-3372
    DOI: 10.1039/c7nr09037d
    PMID: 29620092
  • Source: MEDLINE
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