1. Robust, sustainable, hierarchical multi-porous cellulose beads via pre-crosslinking strategy for efficient dye adsorption.
- Author
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Ding, Yanhong, Song, Chuhan, Gong, Wenli, Liu, Lin, Wu, Mingbang, Li, Lindong, and Yao, Juming
- Subjects
POLYETHYLENEIMINE ,CELLULOSE ,ADSORPTION (Chemistry) ,HYDROGEN bonding interactions ,ADSORPTION capacity ,CELLULOSE fibers - Abstract
Polyethyleneimine-functionalized cellulose beads (PCB-PEI) with hierarchical multi-porous structures were fabricated via a novel strategy combining intermolecular pre-crosslinking with glutaraldehyde chemical crosslinking to improve the specific surface area and mechanical performances of PCB-PEI. The resultant PCB-PEI possessed unique hierarchical architecture consisting of surface interpenetrating porous networks, resulting in large specific surface area of 100.61 m
2 /g and high porosity of 94.27%. In particular, the robust double cross-linking networks endowed PCB-PEI with outstanding stiffness, toughness, and elasticity. The compressive strength was up to 202 kPa, and retained at 94.5 kPa with 84.1% of shape recovery after 10 loading–unloading cycles at 50% compressive strain. Benefiting from its hierarchical multi-porous structure, abundant functional sites, and excellent mechanical properties, PCB-PEI displayed excellent dye adsorption and reusability. The maximum adsorption capacities for methyl blue (MB) and rose bengal (RB) reached 1550.55 and 467.95 mg/g. After 8 cycles, the adsorption capacities of PCB-PEI for MB and RB still maintained more than 97% and 86%, respectively. Predominant electrostatic attraction and hydrogen bond interactions during adsorption process were proposed to improve the adsorption of dyes. Thus, PCB-PEI is a potential, sustainable adsorbent for highly efficient removal of dyes from wastewater. [ABSTRACT FROM AUTHOR]- Published
- 2021
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