Chemistry Reference
In-Depth Information
Fig. 4.11 a
N
2
sorption isotherms of PAF-1 and PAF-1-350, PAF-1-380, PAF-1-400, PAF-1-
450;
b
pore size distributions of PAF-1 and PAF-1-350, PAF-1-380, PAF-1-400, PAF-1-450
derived from N
2
adsorption calculated by Density Functional Theory (DFT);
c
CO
2
adsorption
and desorption isotherms of PAF-1 and carbonized samples at 273 K;
d
Q
STCO
2
of PAF-1 and car-
bonized samples as a function of the amount of CO
2
adsorbed. Reprinted with permission from
Ref. [
59
]. Copyright 2013, Royal Society of Chemistry
different temperature from 350 to 450 °C [
59
]. Calculated from the N
2
sorption
results using BET model, the surface areas of PAF-1-350, PAF-1-380, PAF-
1-400, and PAF-1-450 were 4,033, 2,881, 2,292, and 1,191 m
2
g
−
1
, respec-
tively (Fig.
4.11
a). Calculated by the density functional theory (DFT) method,
the total pore volumes of these samples dropped from 2.43 cm
3
g
−
1
of PAF-1 to
0.53 cm
3
g
−
1
of PAF-1-450. Meanwhile, the pore size distribution shrunk from
1.44 nm of PAF-1 to 1.00 nm of PAF-1-450 (Fig.
4.11
b). Especially, the CO
2
uptake of PAF-1-450 reached 4.5 mmol g
−
1
, at 273 K and 1 bar (Fig.
4.11
c).
As expected, the Qst CO
2
of carbonized PAF-1 increased evidently by comparison
with the original PAF-1 (Fig.
4.11
d).
CCS is a hot topic due to its important environmental sustainability which con-
cerns our daily life. POFs display some advantages in CO
2
capture thanks to their
high surface area, high stability, and adjustable structure. The pioneering studies
provide guidelines for the construction of promising POFs for CCS.
