Journal
CELLULOSE
Volume 26, Issue 4, Pages 2375-2388Publisher
SPRINGER
DOI: 10.1007/s10570-019-02251-0
Keywords
Lignocellulose hydrogel; Lignin; Physical performance; Heavy metal ion removal
Funding
- National Natural Science Foundation of China [31870565]
- Natural Science Foundation of Jiangsu Province [BK20181397]
- Doctorate Fellowship Foundation of Nanjing Forestry University
- Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX17_0845]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Lignocellulose hydrogels (LCGs) with varying lignin content were prepared by the dissolution-regeneration process using N-methylmorpholine-N-oxide solvent system. The varying lignin content in LCGs can lead to different aggregation states due to the hydrophobic association of lignin, with an important impact on the micromorphology and pore structure of hydrogel. The presence of lignin is beneficial for the mechanical improvement of LCGs when lignin content is lower than 6.5%. LCGs with 6.5% lignin exhibits better viscoelasticity (580.0 kPa), compressive modulus (55.0 kPa), and a more homogeneous structure than others. The LCGs with a lignin content of 11.6% exhibit the best adsorption property (86.1mgg(-1) for Pb2+ and 69.3mgg(-1) for Cu2+), which is dominated by chemisorption and multiple diffusion mechanisms. The work provides a feasible route for lignin-containing hydrogel production and develops a method for tailoring micromorphology and the physical properties of the hydrogel by controlling lignin content. [GRAPHICS] .
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