microorganisms completely covered the whole surface of straw and the contact angle
of oil on wet straw decreased to 60–70
, which made it hydrophilic. These results
show that if straw is used for the oil cleanup, it should be replaced by fresh straw
after 15 days because of decomposition of its natural wax.
Another natural sorbent, which has attracted the attention of researchers, is wool
fiber. Sorption properties, reusability, and roughness of the recycled wool fibers
persuaded Radetić et al. (2003) to study the possibility of replacing synthetic
sorbents with wool fiber. They used SN 150, diesel, and crude oil for their experiments. All investigations about wool sorption capacity were performed during a
time span of 10 min. The results indicated that amount of oilsorption of the
nonwoven rises by increasing the content of oil in samples in the following order:
SN 150 > diesel > crude oil. These results show that the sorption behaviors of
various oils are different because of their different viscosities.
The sorption behavior of the dry and water-soaked sorbent showed that dry
samples had better sorption than wet samples. Figure 12.9 compares the sorption
behavior of treated and untreated samples. Treated samples are provided by chitosan
and low-temperature air plasma processes. Sorption properties were significant for
low-temperature air plasma-treated samples especially in the case of crude oil. In oil
bath without any water, the sorption capacity of material was slightly higher.
Recycled wool fibers have different sorption behaviors from raw wool because of
the mechanical and chemical changes during reuse. Nature of lanolin and wax of raw
wool play a major role in adsorption of oil. Different sorption behaviours are not
expected for recycled wool fibres, due to small amount or lack of wax and lanolin or
a small mount.
Fig. 12.9 Effect of treatment on sorption capacity of nonwoven wool fiber in artificial seawater
bath containing 40 g of oil. CHT: chitosan and LTP: low-temperature air plasma. (Modified after
Radetić et al. 2003)
410
M. Fatehi et al.
of oil on wet straw decreased to 60–70
, which made it hydrophilic. These results
show that if straw is used for the oil cleanup, it should be replaced by fresh straw
after 15 days because of decomposition of its natural wax.
Another natural sorbent, which has attracted the attention of researchers, is wool
fiber. Sorption properties, reusability, and roughness of the recycled wool fibers
persuaded Radetić et al. (2003) to study the possibility of replacing synthetic
sorbents with wool fiber. They used SN 150, diesel, and crude oil for their experiments. All investigations about wool sorption capacity were performed during a
time span of 10 min. The results indicated that amount of oilsorption of the
nonwoven rises by increasing the content of oil in samples in the following order:
SN 150 > diesel > crude oil. These results show that the sorption behaviors of
various oils are different because of their different viscosities.
The sorption behavior of the dry and water-soaked sorbent showed that dry
samples had better sorption than wet samples. Figure 12.9 compares the sorption
behavior of treated and untreated samples. Treated samples are provided by chitosan
and low-temperature air plasma processes. Sorption properties were significant for
low-temperature air plasma-treated samples especially in the case of crude oil. In oil
bath without any water, the sorption capacity of material was slightly higher.
Recycled wool fibers have different sorption behaviors from raw wool because of
the mechanical and chemical changes during reuse. Nature of lanolin and wax of raw
wool play a major role in adsorption of oil. Different sorption behaviours are not
expected for recycled wool fibres, due to small amount or lack of wax and lanolin or
a small mount.
Fig. 12.9 Effect of treatment on sorption capacity of nonwoven wool fiber in artificial seawater
bath containing 40 g of oil. CHT: chitosan and LTP: low-temperature air plasma. (Modified after
Radetić et al. 2003)
410
M. Fatehi et al.