期刊
CARBOHYDRATE POLYMERS
卷 136, 期 -, 页码 1194-1202出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.09.099
关键词
Adsorption; Fixed bed column; Cellulose nanocrystals; Alginate; Hydrogel beads
资金
- CelluForce
- AboraNano
- CFI
- NSERC
The adsorption behavior of methylene blue by cellulose nanocrystal-alginate (CNC-ALG) hydrogel beads in a fixed bed column was studied by varying the initial dye concentrations, bed depths and flow rates. An unusual phenomenon was observed in the early phase of the adsorption, and the phenomenon was elucidated by varying other critical design parameters, such as the flow direction, diameter of column and composition of adsorbent. The swelling and shrinkage of hydrogel beads during the adsorption was responsible for the anomalous concentration versus time profile of the adsorption process. The maximum adsorption capacity of the column was 255.5 mg/g, which is in agreement with the batch study determined from the Langmuir adsorption isotherm. A comprehensive understanding on the adsorption mechanism of CNC-ALG hydrogel beads during the early stages of adsorption was derived from this study. (c) 2015 Elsevier Ltd. All rights reserved.
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