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Biohybrid hydrogel and aerogel from self-assembled nanocellulose and nanochitin as a high-efficiency adsorbent for water purificationAuthor(s): Xuefeng Zhang; Islam Elsayed; Chanaka Navarathna; Gregory T. Schueneman; EI Barbary. Hassan
Source: ACS Applied Materials & Interfaces. 11(50): 46714-46725. https://doi.org/10.1021/acsami.9b15139.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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Simple, and Effective Biobased Water Purification Adsorbents for Arsenic and Industrial Dye Capture
DescriptionA simple and novel method, self-assembly of nanocellulose and nanochitin, was developed to produce high-efficiency and versatile biohybrid hydrogel (BHH) and aerogel (BHA) for water purification. The self-assembly process was driven by the electrostatic force between one-dimensional (1D) negatively charged TEMPO-oxidized cellulose nanofiber (TOCNF) and positively charged partly deacetylated chitin nanofiber (PDChNF). The self-assembly process was performed at room temperature and without adding any crosslinking agents throughout the process. This results in the threedimensional (3D) BHH that physically cross-linked via both electrostatic interactions and hydrogen bonding between TOCNF and PDChNF. The obtained BHA from lyophilized BHH exhibited a highly porous interconnected structure with a specific surface area of 54 m2·g−1, which assures the availability of its internal active site for the adsorption of toxic metalloid ions and organic pollutants. Consequently, the BHA displayed super-high adsorption capacities of 217 mg·g−1 for As(III) under the neutral pH conditions and 531 mg·g−1 for methylene blue (MB) under an alkaline aqueous condition with rapid adsorption kinetics, in sharp contrast to conventional biobased adsorbents. Moreover, the BHA is reusable, which still exhibited a high MB adsorption capacity of 505 mg·g−1 even after five successive adsorption−desorption cycles. This versatile BHA produced via a facile preparation strategy is proven to be a promising renewable adsorbent for water purification, offering simple and green alternatives to the conventional adsorbent from synthetic polymers.
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CitationZhang, Xuefeng; Elsayed, Islam; Navarathna, Chanaka; Schueneman, Gregory T.; Hassan, EI Barbary. 2019. Biohybrid hydrogel and aerogel from self-assembled nanocellulose and nanochitin as a high-efficiency adsorbent for water purification. ACS Applied Materials & Interfaces. 11(50): 46714-46725. https://doi.org/10.1021/acsami.9b15139.
KeywordsNanocellulose, nanochitin, self-assembled hydrogel, aerogel, arsenite [As(III)] absorption
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