TY - JOUR
T1 - Performance of dry water- and porous carbon-based sorbents for carbon dioxide capture
AU - Al-Wabel, Mohammad
AU - Elfaki, Jamal
AU - Usman, Adel
AU - Hussain, Qaiser
AU - Ok, Yong Sik
PY - 2019/7/1
Y1 - 2019/7/1
N2 -
Carbon dioxide is the primary greenhouse gas that has a strong impact on global warming. Several technologies have been developed for capturing CO
2
to mitigate the greenhouse effect. The objective of this research was to investigate the performance of several sorbents based on dry water and porous carbon materials for capturing CO
2
. Seven sorbents were prepared and comparatively evaluated for their CO
2
capture capabilities: (i) Conocarpus biochar (CBC); (ii) commercial activated carbon (CAC); (iii) normal dry water (NDW); (iv) K
2
CO
3
-treated CBC (TCBC); (v) K
2
CO
3
-modified dry water (MDW); (vi) MDW and 2% TCBC (MDWTCBC); and (vii) MDW and 2% activated carbon (MDWCAC). The sorption process was carried out with initial CO
2
concentration of 5.7%, temperature of 25 °C, feed gas flow rate of 0.5 l min
−1
and a pressure of 1.0 bar. The pure CO
2
was mixed with O
2
or N
2
to achieve the desired inlet concentration of CO
2
. The CO
2
adsorption capacity and partition coefficient (PC) of the tested sorbents were evaluated at 5% and 100% breakthrough (BT). The results showed a longer breakthrough and equilibrium adsorption times for CO
2
when mixed with N
2
than with O
2
. Among all sorbents, both CAC and CBC showed enhanced CO
2
capture performance with equilibrium (100% BT) adsorption capacities of 239 and 197 mg g
−1
, respectively (in terms of PC: 1.0 × 10
−3
and 7.9 × 10
−4
mol kg
−1
Pa
−1
, respectively). In contrast, the performance of TCBC and the dry water-based sorbents was far lower than CAC or CBC. The CO
2
adsorption data fitted well to the non-linearized form of the pseudo-first-order kinetic model. The Fourier-transform infrared spectral patterns indicated that the reaction of CO
2
molecules with the hydroxyl groups of sorbents is possible through the formation of chemisorbed CO
2
species. It could be concluded that the activation process did not play a role in increasing the CO
2
capture performance in order to form new active sorption sites. However, Conocarpus biochar can be used as efficient sorbent for CO
2
capture with a better performance than other materials tested previously (e.g., activated carbon).
AB -
Carbon dioxide is the primary greenhouse gas that has a strong impact on global warming. Several technologies have been developed for capturing CO
2
to mitigate the greenhouse effect. The objective of this research was to investigate the performance of several sorbents based on dry water and porous carbon materials for capturing CO
2
. Seven sorbents were prepared and comparatively evaluated for their CO
2
capture capabilities: (i) Conocarpus biochar (CBC); (ii) commercial activated carbon (CAC); (iii) normal dry water (NDW); (iv) K
2
CO
3
-treated CBC (TCBC); (v) K
2
CO
3
-modified dry water (MDW); (vi) MDW and 2% TCBC (MDWTCBC); and (vii) MDW and 2% activated carbon (MDWCAC). The sorption process was carried out with initial CO
2
concentration of 5.7%, temperature of 25 °C, feed gas flow rate of 0.5 l min
−1
and a pressure of 1.0 bar. The pure CO
2
was mixed with O
2
or N
2
to achieve the desired inlet concentration of CO
2
. The CO
2
adsorption capacity and partition coefficient (PC) of the tested sorbents were evaluated at 5% and 100% breakthrough (BT). The results showed a longer breakthrough and equilibrium adsorption times for CO
2
when mixed with N
2
than with O
2
. Among all sorbents, both CAC and CBC showed enhanced CO
2
capture performance with equilibrium (100% BT) adsorption capacities of 239 and 197 mg g
−1
, respectively (in terms of PC: 1.0 × 10
−3
and 7.9 × 10
−4
mol kg
−1
Pa
−1
, respectively). In contrast, the performance of TCBC and the dry water-based sorbents was far lower than CAC or CBC. The CO
2
adsorption data fitted well to the non-linearized form of the pseudo-first-order kinetic model. The Fourier-transform infrared spectral patterns indicated that the reaction of CO
2
molecules with the hydroxyl groups of sorbents is possible through the formation of chemisorbed CO
2
species. It could be concluded that the activation process did not play a role in increasing the CO
2
capture performance in order to form new active sorption sites. However, Conocarpus biochar can be used as efficient sorbent for CO
2
capture with a better performance than other materials tested previously (e.g., activated carbon).
KW - Activated carbon
KW - Biochar
KW - CO adsorption
KW - Dry water
KW - Gas adsorbent
KW - Partition coefficient
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U2 - 10.1016/j.envres.2019.04.020
DO - 10.1016/j.envres.2019.04.020
M3 - Article
C2 - 31054524
AN - SCOPUS:85064937897
SP - 69
EP - 79
JO - Environmental Research
JF - Environmental Research
SN - 0013-9351
ER -