Table 1
Keratin nanofibrous membranes characteristics.
Material Keratin nanofibers
Mean diameter 223 ± 74 nm
Thickness (m) 50
Porosity (%) 90
Specific surface (m
2
g
−1
) 13.59
All assays were carried out in triplicate and the mean values
were reported. Data processing was carried out with the ORIGIN
8.1 software (OriginLab Corporation, MA, USA)
(6)
%R =
c0− cf
c0
× 100 (7)
where C0(mg L
−1
) and Cf (mg L
−1
) are the initial and final MB con-centrations, respectively, V (L) is the volume of MB solutions and m
(g) is the mass of nanofibrous membranes.
The effect of initial MB concentration, pH, adsorbent dosage
(ratio between membrane mass and volume of the solution), time
and temperature on adsorption was investigated
[1 M]. The adsorption tests were carried out in batch conditions by
shaking the keratin nanofibrous membranes immersed in 10 ml of
starting MB solutions. The initial and final dye concentrations were
determined with a PerkinElmer spectrophotometer at wavelength
of 665 nm
D
(3)
The density of the nanofibre mat was calculated by using the
mass of the mat in air (m1) and in n-hexane (m2) through the
following equation:
= (m1h
)/(m1− m2) (4)
where his the density of n-hexane at the temperature of mea-surement.The porosity of the membrane (ε) is obtained by using
the equation:
ε =
Vtot − V
Vtot
(5)
where Vtot is the total (apparent) volume, obtained by measuring
the area and the thickness of the mat, and V is the volume, calculated
from measured mass and density of the nanofibrous membrane
Table 1
Keratin nanofibrous membranes characteristics.
Material Keratin nanofibers
Mean diameter 223 ± 74 nm
Thickness (m) 50
Porosity (%) 90
Specific surface (m
2
g
−1
) 13.59
All assays were carried out in triplicate and the mean values
were reported. Data processing was carried out with the ORIGIN
8.1 software (OriginLab Corporation, MA, USA)
(6)
%R =
c0− cf
c0
× 100 (7)
where C0(mg L
−1
) and Cf (mg L
−1
) are the initial and final MB con-centrations, respectively, V (L) is the volume of MB solutions and m
(g) is the mass of nanofibrous membranes.
The effect of initial MB concentration, pH, adsorbent dosage
(ratio between membrane mass and volume of the solution), time
and temperature on adsorption was investigated
[1 M]. The adsorption tests were carried out in batch conditions by
shaking the keratin nanofibrous membranes immersed in 10 ml of
starting MB solutions. The initial and final dye concentrations were
determined with a PerkinElmer spectrophotometer at wavelength
of 665 nm
D
(3)
The density of the nanofibre mat was calculated by using the
mass of the mat in air (m1) and in n-hexane (m2) through the
following equation:
= (m1h
)/(m1− m2) (4)
where his the density of n-hexane at the temperature of mea-surement.The porosity of the membrane (ε) is obtained by using
the equation:
ε =
Vtot − V
Vtot
(5)
where Vtot is the total (apparent) volume, obtained by measuring
the area and the thickness of the mat, and V is the volume, calculated
from measured mass and density of the nanofibrous membrane
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