Esmael Sanchooli - Department of Chemistry, University of Zabol, Zabol, Iran
Somaye Shahraki - Department of Chemistry, University of Zabol, Zabol, Iran

Lead is a highly toxic environmental pollutant; thus, there is an urgent need to develop new materials for its simultaneous detection and removal from water (1-3). In this study 2- Amino hydroxypyridine derivatives functionalized-chitosan adsorbent was synthesized. The adsorbent was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), dynamic light scattering (DLS), vibrating sample magnetometer (VSM) and X-ray Diffraction (XRD). The adsorption capability of modified chitosan was investigated by the removal of Pb(II) from aqueous solutions. The adsorption and regeneration studies were performed by batch techniques. The effects of pH, contact time, and initial metal concentration were studied. Metal uptake by Schiff base-chitosan was 112.34 mg/g for Pb(II) ion. The kinetics of Pb(II) on Schiff base-chitosan complied with the pseudo-second-order model. The equilibrium data were fitted to Langmuir and Freundlich isotherm models. The mechanism for Pb+2 adsorption onto adsorbent involved the interactions of N, O and also aromatic rings with heavy metal followed by their adsorption on the MCS-Sch.

Schiff base, Modified chitosan, Heavy metal removal, Mechanism