Journal
CARBOHYDRATE POLYMERS
Volume 214, Issue -, Pages 294-302Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.03.058
Keywords
Cellulose; Chitosan; Dialdehyde cellulose; LiBr; Adsorbent
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology [NRF-2018R1A2B6002983]
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The adsorption of Congo red (CR) was evaluated using cellulose-chitosan foam crosslinked via dialdehyde cellulose (DAC). DAC-crosslinked cellulose-chitosan foam (CCLBD) was obtained by dissolution/regeneration using a LiBr aqueous solution, followed by crosslinking between chitosan and DAC. CCLBD possessed a three-dimensional structure with 40-200 nm wide pores composed of nanofibrils with a width of 10-20 nm, resulting in a high specific surface area of 230 m(2)/g. CCLBD was highly stable even acidic conditions in spite of a low crosslinking degree of 10.3%, which induced a slight reduction in the amino groups that interact with CR. CCLBD showed a CR adsorption capacity of 1548.2 mg/g and the adsorption process followed the Sips isotherm and pseudo-second-order models.
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