Abstract
In this study, the cellulose nanocrystals (CNC) obtained by acid hydrolysis of microcrystalline cellulose (MCC) are customized by suspension to obtain a spherical CNC hydrogel. The N-(2-aminoethyl) (3-amino-propyl) methyldimethoxyansile (AEAPMDS) preparation was grafted to spherical CNC hydrogel using a water phase heat treatment. Finally, aerogel samples were obtained by tert-butanol replacement and freeze-drying. The test results confirmed that the aminosilane was grafted on CNC. Electron micrographs and N2 sorption isotherms showed that the pores of the aerogel were partially blocked due to the introduction of AEAPMDS, and the specific surface area was decreased. Due to the presence of chemisorption, the amount of CO2 adsorbed at a pressure of 3 bar by the modified aerogel (2.63 mmol/g) was greatly improved compared with the unmodified aerogel (0.26 mmol/g), and the adsorption results were fit well by the Langmuir model. Thus, our experiments provided the opportunity to develop a new CO2 absorbent material.
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This work was financially supported by the Special Fund for Forest Scientific Research in the Public Welfare (201504603).
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Zhang, T., Zhang, Y., Jiang, H. et al. Aminosilane-grafted spherical cellulose nanocrystal aerogel with high CO2 adsorption capacity. Environ Sci Pollut Res 26, 16716–16726 (2019). https://doi.org/10.1007/s11356-019-05068-3
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DOI: https://doi.org/10.1007/s11356-019-05068-3