BASIC CONCEPTS AND AN OVERVIEW - Foundations of Nanotechnology: Pore Size in Carbon-Based Nano-Adsorbents - page 67

nano composite have an energy density of 6.97 Wh/kg and an outstanding power
performance [65].

1.1.11.5 MACROPOROUS CARBON FOR HEAVY OIL SORPTION
AND RECOVERY
Exfoliated graphite was found to sorb a large amount of heavy oils at room tem-
perature very quickly, more than 80 kg.kg −1 within 1 min. Different carbon materi-
als were studied through the determination of sorption capacity, sorption kinetics,
and repeated sorption/desorption cycles in order to recover spilled heavy oils and
also to recycle both heavy oils and carbon materials. Exfoliated graphite was then
applied to sorb other oils, such as cooking and engine oils and also to organics
with large molecules, such as biofluids. Exfoliated graphite with a low bulk den-
sity has very high sorption capacity for heavy oil, but its sorption rate is rather
low. By increasing its bulk density, the sorption rate can be improved slightly,
but sorption capacity decreases quickly at the same time. Carbonized fir fibers
have a sorption capacity comparable with the exfoliated graphite and the same
dependence on bulk density. By densification of carbonized fiber felts, however,
sorption rate increases rather rapidly. These high sorption capacities for the car-
bon materials were found to be mainly because of flexible macropores in these
carbon materials. Macropores with the size in the range of 1-600 micrometers are
primarily responsible for heavy oil sorption [1].

1.1.12 RECENT STUDY WORKS ABOUT CONTROLLING OF PORE

SIZE
Summary of some recently reported papers about confirmal modeling of control-
ling of pore size in carbon based nano adsorbent are presented in Table 1.4 [8, 40,
121]:

TABLE 1.4 Summary of Recently Confirmal Models for Controlling of Pore Size in
Carbon Based Nano Adsorbents

Carbon Material Type Applied Model and Simulation Methods References

AC, ACF, MSC N 2 adsorption at77 K and t-plot, Alpha-plot [8]

Carbon structures N 2 adsorption at77 K and Alpha-plot [9]

AC G CMC and DFT (Monte carlo simulations) [10]

Carbon structures N 2 and NLDFT model [11]

AC G CMC [12]

ACF H 2 S adsorption [13]