The increased CO₂ adsorption performance of chitosan-derived activated carbons with nitrogen-doping

Abstract

Highly porous nitrogen-doped activated carbons (NACs) were prepared by the chemical activation of chitosan using alkali carbonates. The NACs exhibited extremely high CO2 capacities of 1.6 mmol g(-1) (15 kPa) and 4.9 mmol g(-1) (100 kPa) at 25 °C. Nitrogen atoms doped into carbon frameworks clearly enhanced CO2 adsorption at low partial pressures.

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO2 capture at high pressure

“…The presence of nitrogen enhances the interactions between activated porous biocarbon and CO 2 resulting in higher isoelectric heats of adsorption. 18,52,53 It is proposed that a higher content of nitrogen tends to shi the process of CO 2 adsorption from just van der Waal's interactions to somewhat stronger physical forces such as pole-pole interactions 54 and hydrogen bonding. 55 Aer the CO 2 adsorption, the spent activated porous biocarbon materials were easily regenerated by heating under vacuum up to a temperature of 250 C and then retested for CO 2 uptake.…”

Energy efficient synthesis of highly ordered mesoporous carbon nitrides with uniform rods and their superior CO2adsorption capacity

“…[8][9][10] A number of different porous materials such as mesoporous silica MCM-41, SBA-15, porous carbons, zeolites and metal organic frameworks (MOFs) and their amine functionalized versions have been investigated as solid adsorbents. [3][4][5][6][7][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]28 Sayari and co-workers have extensively studied the adsorption of CO 2 over pure mesoporous silica with an ordered porous structure at different temperatures and pressures. They realised that the surface functional groups on the mesoporous materials are the key to enhance the adsorption of CO 2 .…”

“…16,17 In the other approach, porous carbons are treated with suitable amines. 18 A further activation procedure for N doped carbons is oen attempted to increase the surface area using different acids such as H 3 PO 4 , HNO 3 or alkalis such as KOH. 19 It has been found that the incorporation of N atom in the carbon matrix results in a signicant improvement in the adsorption of CO 2 .…”

“…19 It has been found that the incorporation of N atom in the carbon matrix results in a signicant improvement in the adsorption of CO 2 . [20][21][22][23][24] For example, Fujiki reported the enhanced CO 2 adsorption of chitosan derived activated carbon with nitrogen doping and found the CO 2 adsorption to be 4.9 mmol g À1 at 1 bar and 25 C. 18 Similarly, Jaroniec and co-workers reported the CO 2 adsorption capacity of nitrogen enriched porous carbon spheres to be 4.1 mmol g À1 at 25 C and 1 bar. 16 These results are highly impressive however, the preparation of N doped carbon by functionalization and an activation method requires expensive, hazardous chemicals in a complex process and damages the structure and properties of the parent porous carbon materials.…”

Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO2 adsorption

“…A suitable CO 2 adsorbent should have a high specific surface area, a high porosity with proper pore sizes, a favorable surface chemistry, and a high chemical/ mechanical stability. Many CO 2 adsorbents based on different materials, such as zeolites (Banerjee et al 2009;Cavenati et al 2004;Kongnoo et al 2017;Ojuva et al 2013), silica gels (Arellano et al 2016), activated carbon (Fujiki and Yogo 2016;Roberts et al 2017;Singh et al 2017), and metal-organic frameworks (An and Rosi 2010;Millward and Yaghi 2005;Salehi and Anbia 2017), have been investigated in recent decades. However, adsorbents based on these materials have some drawbacks, such as their high cost, complex preparation methods, toxicities, and the use of corrosive materials during their preparation.…”