Preparation of cellulose-chitosan foams using an aqueous lithium bromide solution and their adsorption ability for Congo red

Herein, we present a new process for the preparation of cellulose-chitosan foams using an aqueous lithium bromide (LiBr) solution. After obtaining hydrogels via dissolution-regeneration from an aqueous LiBr solution and methanol, cellulose-chitosan foams were prepared via solvent exchange (water → e...

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Bibliographic Details
Published in:Cellulose (London) 2018-04, Vol.25 (4), p.2615-2628
Main Authors: Kim, Ung-Jin, Kim, Dabum, You, Jungmok, Choi, Joon Weon, Kimura, Satoshi, Wada, Masahisa
Format: Article
Language:English
Subjects:
Adsorption
Bioorganic Chemistry
Butanol
Cellulose
Cellulose fibers
Ceramics
Chemistry
Chemistry and Materials Science
Chitosan
Composites
Ethanol
Glass
Hydrogels
Industrial wastes
Lithium
Natural Materials
Organic Chemistry
Original Paper
Physical Chemistry
Plastic foam
Polymer Sciences
Regeneration
Sustainable Development
Wastewater treatment
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Summary:Herein, we present a new process for the preparation of cellulose-chitosan foams using an aqueous lithium bromide (LiBr) solution. After obtaining hydrogels via dissolution-regeneration from an aqueous LiBr solution and methanol, cellulose-chitosan foams were prepared via solvent exchange (water → ethanol →  t -butyl alcohol) followed by freeze-drying. The amino group content and elemental analysis confirmed the successful preparation of three foam grades by controlling the blend ratio of cellulose and chitosan. The cellulose-chitosan foams possessed three-dimensional porous networks composed of nano-fibrils. The swelling properties of the foams improved due to the presence of amino groups. The cellulose-chitosan foams exhibited a higher adsorption capacity (1170.2 mg/g) of Congo red compared to the cellulose (623.2 mg/g). The adsorption–desorption process of Congo red demonstrated the strong interactions between chitosan and Congo red. The cellulose-chitosan foams could be applied as an adsorbent for the treatment of industrial wastewater, especially for anionic dyes.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-018-1742-2