Abstract
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 Pb2+ via lead ion imprinting technology and crosslinking reactions among chitosan (CTS), Serratia marcescens and Fe3O4. 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.
Highlights
Heavy metal pollution in the environment, which cause harmful effects on human health, has attracted much attention
Ion imprinting polymers (IIPs) for the removal or detection of heavy metals have been studied, and the results have demonstrated that the IIPs express strong affinity and excellent selectivity of the template ions [40,41,42,43,44]
The negative charge of the Pb(II)-IMB would be favored at pH higher than the pHpzc
Summary
Heavy metal pollution in the environment, which cause harmful effects on human health, has attracted much attention. High efficient removal of Pb(II) ions could provide the basis for Pb(II) pollution prevention and protecting public health. Adsorption is achieved by adsorbent combining with pollutants by physical and chemical attractive forces and is considered one of the most successful and economical technologies for removing contaminants from aqueous solution [13,14,15]. Various adsorbents, such as carbonaceous materials [16], minerals [17] and macromolecules [18], have been widely applied to remove Pb(II). As green adsorbents, are a promising material for treatment of Pb(II) contaminated water
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
