Investigate the adsorption mechanism of heavy metals as chromium ions (Cr+3) from different solutions using modified chitosan

Abstract

T HE OBJECTIVE of this study is to assess the removal of Cr (III) ions onto modified chitosan-starch from aqueous solutions under both acidic and basic conditions. The effect of various parameters has been investigated via batch adsorption technique. Such parameters include initial concentration of adsorbate, agitation time, adsorbent dosage, chemical kinetics, and influence of temperature. The experimental data were fit well to Frendlich adsorption isotherm. The thermodynamic parameters such as ΔH, ΔS and ΔG were calculated, indicating that the adsorption was spontaneous and endothermic in nature. Experimental Materials and methodAnalytical X-Ray Diffraction equipment; model X-Pert with secondary monochromator, Cu-radiation (λ=1.542 Å) at 45 K.V., 35 M.A. and scanning speed 0.02 o /sec. were used. The diffraction peaks between 2Ɵ = 0 o and 60 o ,

Preparation and characterization of ion exchanger based on bacterial cellulose for heavy metal cation removal

“…The desorption efficiency reached about 90% after the first cycle. We use mild desorbed agent NaCl to keep fine structure of bacterial cellulose or its active sites [35][36][37] and therefore it can be used as desorption solution. So that results of five adsorptions -desorption replications 4%, 1.71%, 1.04% was decrease in absorption capacity after five cycles.…”