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- Title
pH-responsive Hydrogels of Carboxymethyl Cellulose and Polyethyleneimine for Efficient Removal of Ionic Dye Molecules.
- Authors
Minjung Jung; Jungkyu Kim; Seungoh Jung; YunJin Kim; Junsik Bang; Hwanmyeong Yeo; In-Gyu Choi; Hyo Won Kwak
- Abstract
A carboxymethyl cellulose (CMC)/polyethyleneimine (PEI) hybrid hydrogel was successfully prepared under green processing conditions. The CMC and PEI formed a polyelectrolyte complex, and the three-dimensional (3D) network structure was hardened by chemical crosslinking, resulting in suitable hydrogel properties. In the prepared CMC/PEI polyelectrolyte hydrogel, the surface charge was easily switched according to the pH change, and the resulting swelling and contraction was reversible. The pH sensitivity of the CMC/PEI hydrogel was effective in removing ionic dye contaminants, and as a result, it showed an excellent removal capacity of 319 mg/g for anionic acid orange (AO) and 129 mg/g for cationic methylene blue (MB). In addition, the CMC/PEI polyelectrolyte hydrogel maintained structural stability despite repeated changes in surface charge characteristics and shrinkage-swelling due to repeated pH conversion. As a result, in the reuse process through repeated adsorption and desorption, it showed an excellent reuse efficiency of more than 93% even after 10 reuse cycles.
- Subjects
CARBOXYMETHYLCELLULOSE; IONS; POLYETHYLENEIMINE; BASIC dyes; SURFACE charges; HYDROGELS; METHYLENE blue
- Publication
BioResources, 2022, Vol 17, Issue 4, p5785
- ISSN
1930-2126
- Publication type
Article
- DOI
10.15376/biores.17.4.5785-5802