Environmental Engineering Reference
In-Depth Information
120
(a)
CNT
20°C
40°C
60°C
80°C
100°C
100
80
60
40
20
0
(b)
CNT(APTS)
100
80
60
40
20
0
0
10
20
30
C
in
(%)
40
50
fiGure 21.16
Adsorption isotherms of CO
2
via CNTs and CNT(ApTS) at multiple temperatures. Reprinted with permission from
Ref. [38]. © 2009, Elsevier.
3.0
2.5
2.0
1.5
1.0
0.5
0.0
CNTs
CT-10
CT-20
CT-30
CT-40
fiGure 21.17
CO
2
adsorption capacity of CNTs and CNTs−TEpA-n at 25°C (gas flow rate, 50 ml min
-1
; CO
2
concentration, 2.0 vol%)
Reprinted with permission from Ref. [49]. © 2012, American Chemical Society.
for long durations of human operation in a confined space, which has made low CO
2
concentration capture a critical technology. They
evaluated the adsorption capacity of CNT sorbents with four different TEpA loadings: 10 (CT-10), 20, 30, and 40%.
Considering the low concentration of CO
2
in the feed (2%), the adsorption capacity of CNT-30 of 2.97 mmol g
-1
sorbent
(equivalent to 130.68 mg CO
2
g
-1
sorbent) is much higher than that of other amine-functionalized adsorbents reported in the
literature under the same operational conditions [55-58].
