Preparation of an Amine-Modified Cellulose Nanocrystal Aerogel by Chemical Vapor Deposition and Its Application in CO₂ Capture

Abstract

At present, cellulose nanocrystal (CNC) aerogels with high adsorption properties for CO 2 are mostly prepared by the liquid phase method which leads to the problem of modifier loss. In this work, a novel amino CNC aerogel was developed by chemical vapor deposition using 3-(2-aminoethylamino)-propylmethyldimethoxy silane (APS) as the modifier, which improved the utilization ratio of the modifier while ensuring the CO 2 adsorption performance. Herein, the as-prepared APS− CNC aerogel was characterized with elemental and functional groups and thermal, morphological, and structural characteristics by various measurements (X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, and Brunauer−Emmet− Teller equation). It exhibited a porous network structure with low specific surface area (29.14 m 2 /g) and excellent thermal stability. Furthermore, the CO 2 adsorption capacity of the CNC aerogel grafted with APS reached 1.5034 mmol/g (25 °C, 1 bar, and pure dry CO 2 atmosphere). Meanwhile, the APS−CNC aerogel showed excellent CO 2 adsorption/desorption recyclability after 10 cycles. The experimental results showed that the CNC aerogel modified by chemical vapor deposition had an important potential role as a biomass CO 2 solid adsorbent.

Liquefiable biomass-derived porous carbons and their applications in CO2capture and conversion

“…CNCs usually have higher crystallinity, shorter length (<100 nm) and higher dispersion than CNFs, which are widely used to enhance the failure strain of composites. 156,157 Studies focusing on the use of CNFs and CNCs as CO 2 adsorbents and catalysts have main strategies including: (i) the chemical modification of nanocellulose (amino-modified) [158][159][160] and (ii) the incorporation of inorganic particles into nanocellulose (e.g., silica, zeolite, carbon). 152,161,162 Bacterial nanocellulose is a porous nanoscale biopolymer synthesized by microbial fermentation.…”

The Influence of Saturated Steam on Moso Bamboo Quasi-static Micromechanical Properties: Nano-Scale Evaluation

“…In addition. The loss of volatile composition from extractives may also contribute to these observations when the treatment temperature above 160℃ (Zhu et al 2020).…”

Recyclable Bacterial Cellulose Aerogel for Oil and Water Separation

“…Using modi ers, the surface hydrophobization of cellulose aerogels were realized mainly via two different routes, gas phase reaction, and aerogel or hydrosol immersed in liquids containing modi ers. It is noted that most of the plantderived cellulose aerogels were hydrophobic via gas phase reactions [22][23][24], while the reported BC aerogels were often hydrophobic modi ed in liquids containing modi ers. Wang et al [25] prepared a superhydrophobic BC aerogel by immersing BC hydrogel in a modi er solution containing stearic acid, giving the maximum adsorption capacity for soybean oil of 48.2 g/g.…”