3.2.2. Effect of adsorbent dosage
In order to investigate the effect of adsorbent dosage, MB uptake
was evaluated using different ratios between keratin nanofibrous
membrane mass (g) and volume (L) of MB solution (adsorbent
dosage). The experiments were carried out using a MB solution
at initial dye concentration of 250 mg L
−1
at pH 6, at a tempera-ture of 20
◦
C, and a contact time of 24 h. The behavior of adsorption
capacity and removal efficiency in function of adsorbent dosage are
plotted in Figs. 2b and 3b, respectively. Along with the adsorbent
dosage increase from 0.1 g L
−1
to 2 g L
−1
, the adsorption capacity
decreased from 1320 to 127 mg g
−1
(Fig. 2b). For constant initial dye
concentration, with increasing the adsorbent dosage the interfacial
tension between the two phases increases and, as a consequence,
the driving force for the mass transfer decreases, reducing in this
way the adsorption capacity.
On the other hand, the removal efficiency increased from 59%
to 97% (Fig. 3b) and this can be attributed to higher availability of
more adsorption sites.
It is worth noting that the high specific surface area and porosity
of nanostructured membranes conferred a great removal efficiency
of dye also at relatively low adsorbent dosage
3.2.2. Effect of adsorbent dosage
In order to investigate the effect of adsorbent dosage, MB uptake
was evaluated using different ratios between keratin nanofibrous
membrane mass (g) and volume (L) of MB solution (adsorbent
dosage). The experiments were carried out using a MB solution
at initial dye concentration of 250 mg L
−1
at pH 6, at a tempera-ture of 20
◦
C, and a contact time of 24 h. The behavior of adsorption
capacity and removal efficiency in function of adsorbent dosage are
plotted in Figs. 2b and 3b, respectively. Along with the adsorbent
dosage increase from 0.1 g L
−1
to 2 g L
−1
, the adsorption capacity
decreased from 1320 to 127 mg g
−1
(Fig. 2b). For constant initial dye
concentration, with increasing the adsorbent dosage the interfacial
tension between the two phases increases and, as a consequence,
the driving force for the mass transfer decreases, reducing in this
way the adsorption capacity.
On the other hand, the removal efficiency increased from 59%
to 97% (Fig. 3b) and this can be attributed to higher availability of
more adsorption sites.
It is worth noting that the high specific surface area and porosity
of nanostructured membranes conferred a great removal efficiency
of dye also at relatively low adsorbent dosage
การแปล กรุณารอสักครู่..