Introduction
The environmental pollution of water by oil has been a specific
and serious problem [1,2]. An oil spill in the environment causes
adverse effects on wildlife and loss of oil, therefore, it is important
to establish and develop techniques of oil removal from the water
environment in order to apply the appropriate procedure to the
cleanup of the oil pollution. The use of an oil sorbent is the commonly
used technique to remove oil from the environment [3–8].
Recently, the application of natural fibers, such as cotton [9], cotton
grass fiber [10], milkweed, kenaf [11], vegetable fibers [12] and
wool [13,14], as the material for the removal of oil has been studied,
and some of them showed higher oil-sorption capacities for oil than
the typical synthetic oil sorbent made of polypropylene. Natural oil
sorbent fibers are environmentally friendly materials, because of
their biodegradability and reusability. This feature makes natural
fibers very attractive as oil sorbents compared to synthetic fibers.
In this study,we investigated the utilization of silkworm cocoon
waste as a low cost sorbent for the removal of oil from water. In
general, the silkworm cocoon is expensive. However, most of the
pierced cocoons or very dirty cocoons of the silkwormare discarded
as industrial wastes, and can be obtained as a low cost material.
The silkworm cocoon has the properties of a slow biodegradability
[15], and the shell of the silkworm cocoon contains wax and shows
hydrophobic property [16] which are important preconditions for
an efficient oil sorbent [17]. Based on these facts, there is the possibility
that the silkworm cocoon waste acts as a high performance
material for the sorption of oil. The silkworm cocoonwaste without
removal of sericin wasmilled, and the obtained flocculate material
(Fig. 1b) was used as a sorbent for oil in this study. The oil-sorption
capacity, rate and reusability of the silkworm cocoonwaste sorbent
(SCWS) were investigated.
Introduction
The environmental pollution of water by oil has been a specific
and serious problem [1,2]. An oil spill in the environment causes
adverse effects on wildlife and loss of oil, therefore, it is important
to establish and develop techniques of oil removal from the water
environment in order to apply the appropriate procedure to the
cleanup of the oil pollution. The use of an oil sorbent is the commonly
used technique to remove oil from the environment [3–8].
Recently, the application of natural fibers, such as cotton [9], cotton
grass fiber [10], milkweed, kenaf [11], vegetable fibers [12] and
wool [13,14], as the material for the removal of oil has been studied,
and some of them showed higher oil-sorption capacities for oil than
the typical synthetic oil sorbent made of polypropylene. Natural oil
sorbent fibers are environmentally friendly materials, because of
their biodegradability and reusability. This feature makes natural
fibers very attractive as oil sorbents compared to synthetic fibers.
In this study,we investigated the utilization of silkworm cocoon
waste as a low cost sorbent for the removal of oil from water. In
general, the silkworm cocoon is expensive. However, most of the
pierced cocoons or very dirty cocoons of the silkwormare discarded
as industrial wastes, and can be obtained as a low cost material.
The silkworm cocoon has the properties of a slow biodegradability
[15], and the shell of the silkworm cocoon contains wax and shows
hydrophobic property [16] which are important preconditions for
an efficient oil sorbent [17]. Based on these facts, there is the possibility
that the silkworm cocoon waste acts as a high performance
material for the sorption of oil. The silkworm cocoonwaste without
removal of sericin wasmilled, and the obtained flocculate material
(Fig. 1b) was used as a sorbent for oil in this study. The oil-sorption
capacity, rate and reusability of the silkworm cocoonwaste sorbent
(SCWS) were investigated.
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