Fig. 12.41 (a) A water droplet on the fixed powder on a glass slide using a thin layer of glue,
contact angle (CA) ¼ 152
, (b) a water droplet on a flat piece of fatty-acid-treated natural calcite
crystal, CA ¼ 93
, (c) a diesel oil droplet on the treated flat piece of calcite crystal, CA ¼ 42
and
(d) a crude oil droplet on the treated flat piece of calcite crystal, CA ¼ 25
C. Reprinted with
permission of (Superhydrophobic and oleophilic calcium carbonate powder as a selective oil
sorbent with potential use in oil spill cleanups, Arbatan et al., Elsevier)
Fig. 12.42 Oil–water mixture: (a) before addition, (b) after addition, and (c) after separation of
powder; 10 g of diesel oil (red) was added to 90 g water, then 10 g of as-prepared sorbent was added
to the mixture. Reprinted with permission of (Superhydrophobic and oleophilic calcium carbonate
powder as a selective oil sorbent with potential use in oil spill cleanups, Arbatan et al., Elsevier)
Table 12.20 The oilsorption efficiency (%) for diesel and crude oils for different oil/water ratios
Oil/water ratio (w/w)
Diesel oil–water
Crude oil–water
1:100
99.6
99.5
1:50
99.2
99.1
1:20
98.7
98.9
1:5
98.5
98.2
1:1
98.3
98.1
Modified after Arbatan et al. (2011)
460
M. Fatehi et al.