SEM characterization of biosorbents
The surface morphology of these three biosorbents was observed
using scanning electron microscope (SEM). After drying,
the samples were covered with a thin layer of gold (10 nm) using
a sputter coater and observed using the scanning electron microscope
(20 kV) under vacuum of 1.33 106 mBar. Biosorbents in
different situations (before biosorption process, after biosorption
process and after desorption process) were observed.