Study of heavy metal Pb2+ and Hg2+ ions adsorption by extracted chitosan

الملخص EN

In this research work natural bio polymer “chitosan” was synthesized using fish shells and adsorption of lead and yrecrem ions by chitosan erer studied.

Synthesize of chitosan involved eeerr main stages, demineralization, deproteinization and deacetylation.

Chitosan was characterized using Fourier Transform Infrared Spectroscopy (FTIR) and solubility in 1 % acetic acid.

The affinity of chitosan for lead and mercury was studied using Pb(NO3)2 and HgCl2 solution as the heavy metal solutions containing Pb (II) and Hg (II) ions.

The ability of chitosan as an adsorbent for Pb (II) and Hg (II) ions in aqueous solution was studied.

The capacity of chitosan to trap lead and mercury ions in aqueous solution was carried out at 30oC using concentration as parameters.

Our results show that the adsorption process is concentration-driven with high capacity of chitosan for the adsorption of these metals ions.

The Infra red spectroscopic study on the chitosan and the metal-chitosan complexes reveal a metal coordination based on the observed characteristic band changes.

At initial lead and mercury concentrations of 3, 5, 8 and 10 mg/L, the adsorbed ions concentrations were 2.7495, 4.5873, 7.4897 and 9.3648 mg/L for lead ions, and 2.8160, 4.6495, 7.2916 and 9.4551 for mercury ion.