3.2.4. Effect of temperature
In order to study the effect of temperature on the adsorption
process of MB onto keratin nanfibrous membranes, the experi-ments were carried out at temperatures of 20, 30, 40 and 50
◦
C,
using a solution at initial MB concentration of 250 mg L
−1
, pH 6 and
an adsorbent dosage of 1 g L
−1
.
Figs. 2d and 3d show the influence of temperature on the adsorp-tion capacity and removal efficiency, respectively. In particular,
both adsorption capacity and removal efficiency slightly decreased
with increasing the temperature; this suggests that the interactions
between the cationic dye and active chemical groups of keratin
were lower at higher temperatures