Preparation, structural changes and adsorption performance of heavy metal ions on sulfonated cellulose with varying degrees of substitution
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Cuihua Dong
Abstract
Sulfonated cellulose (SC) with varying degrees of substitution (DS) were prepared with the pyridine sulfur trioxide complex (Py-SO3) as a sulfonation reagent (as a source of sulfur trioxide) in dimethyl formamide (DMF) as a solvent, where the DS was primarily affected by the molar ratio between Py-SO3 and the anhydroglucose (AHG) unit. Sulfonation temperature and residence time have less effect on DS. The ratio of the crystalline domain of SC decreased gradually with incremental DS, and the crystalline cellulose I of SC at DS0.81 nearly disappeared, and the moiety of the paracrystalline SC with high hydrophilicity increased. The thermostability decreased with increasing DS as a consequence of crystalline domain decrement. The adsorption performance of SC to metal ions was enhanced with increasing DS. However, above DS 0.62, the adsorption capacity enhancement is negligible. For an economic adsorption of heavy meatal ions in effluents, the DS of SC must be optimized.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors are grateful for the financial support from Natural Science Foundation of Shandong Province (ZR2017MC007), R&D Focus of Shandong Province (2017GGX80102), State Key Laboratory of Pulp and Paper Engineering (project no. 201720), and the Taishan Scholars Project Special Funds.
Employment or leadership: None declared.
Honorarium: None declared.
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Articles in the same Issue
- Frontmatter
- Original Articles
- Accessing the natural variation of the abundances of major lignans in the heartwood of Taiwania cryptomerioides by 1H-NMR and LC-MS profiling
- Rapid detection of several endangered agarwood-producing Aquilaria species and their potential adulterants using plant DNA barcodes coupled with high-resolution melting (Bar-HRM) analysis
- Changes in sorption and electrical properties of wood caused by fungal decay
- Effect of hardening parameters of wood preservatives based on tannin copolymers
- In situ polymerization of 2-hydroxyethyl methacrylate (HEMA) and 3-(methacryloxy)propyltrimethoxysilane (MAPTES) in poplar cell wall to enhance its dimensional stability
- Isolation of pure pinosylvins from industrial knotwood residue with non-chlorinated solvents
- Towards better UV-blocking and antioxidant performance of varnish via additives based on lignin and its colloids
- Thermal stability of lignin in ground pulp (GP) and the effect of lignin modification on GP’s thermal stability: TGA experiments with dimeric lignin model compounds and milled wood lignins
- Preparation, structural changes and adsorption performance of heavy metal ions on sulfonated cellulose with varying degrees of substitution
- Mass transport and yield during spinning of lignin-cellulose carbon fiber precursors
