It is vital to understand the adsorption mechanisms and identify the adsorption
kinetics when applying an adsorbent to remove heavy metals from aqueous
solution. A Pb(II) imprinted magnetic biosorbent (Pb(II)-IMB) was developed for
the removal of Pb
2+
via lead ion imprinting technology and
crosslinking reactions among chitosan (CTS),
Serratia
marcescens
and Fe
3
O
4
. The effect of different
parameters such as solution pH, adsorbent dosage, selectivity sorption and
desorption were investigated on the absorption of lead ion by Pb(II)-IMB. The
adsorbent was characterized by a Brunauer-Emmett Teller (BET) analysis, X-ray
diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron
microscopy (SEM) and energy dispersive spectrometry (EDS). The adsorption
kinetics, equilibrium and thermodynamics of Pb(II)-IMB for Pb(II) were studied.
The results of the abovementioned analyses showed that the adsorption kinetic
process fit well with the second-order equation. The adsorption isotherm process
of Pb(II) on the Pb(II)-IMB was closely related to the Langmuir model.
Thermodynamic studies suggested the spontaneous and endothermic nature of
adsorption of Pb(II) by Pb(II)-IMB. The adsorption mechanism of Pb(II)-IMB was
studied by Fourier transform infrared spectroscopy (FTIR) and X-ray
photoelectron spectroscopy (XPS). The results indicated that the nitrogen in the
amino group and the oxygen in the hydroxyl group of Pb(II)-IMB were coordination
atoms.
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