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CO 2
adsorbed, mmol/g
92 Chapter 4
3
parent Ru-MOF
1a
1c
1d
2
1
0
0 200 400 600 800 1000
P, mbar
Figure 4.27. CO 2 isotherms collected at 298 K for the parent Ru-MOF and DEMOF derivatives 1a
(8%), 1c (32%) and 1d (37%) with 5-OH-ip DL. Black circles – parent Ru-MOF; blue triangles –
1a; magenta squares – 1c; dark yellow stars – 1d.
CO2 adsorption isotherms (298 K) of the parent reference Ru-MOF sample and 1a and 1c
display a gradual enhancement of the adsorption capacity in the order Ru-MOF < 1a < 1c
along with rising incorporation degree of DL (Figure 4.27). However, the CO2 uptake of
the sample 1d revealed to be 2.9 mmol/g at 1 bar, and lies within the order Ru-MOF < 1d
< 1c (Table 4.6). According to our studies on different defects in the series 1a-1d, these
results are not unexpected. The increase of the CO2 uptake is attributed to the reduced Rusites
at the type A defects and somewhat lowered uptake of 1d is attributed to less
abundant Ru-sites as a consequence of missing metal-nodes (i.e., type B defects). Hence,
higher incorporation level of DL in the sample 1d does not promote the increase of the
CO2 uptake.