tMacroporous chitosan/poly(vinyl alcohol) membrane adsorbents were synthesized by solvent evapo-ration in the presence of poly(ethylene glycol) which was utilized as porogen. The membranes wereapplied for Cu(II) ion adsorption from water. SEM, AFM and wettability analyses were performed for mem-brane characterization. Insertion of poly(ethylene glycol) generated macrovoids in the dense structureof CS/PVA membranes through particulate leaching out mechanism. According to the static adsorptiontests, the uptake capacity of the porous membranes is elevated (∼26 mg/g) compared to that of the densemembranes (∼10 mg/g). This phenomenon is attributed to the increase in the density of active sites,water affinity and surface roughness as a result of the porogen effects. The approachability of the ions tothe active sites was also affected by these important parameters. Both size and density of the macrovoidsincreased with increasing PEG content from nil to 5 wt%. Fragility of the resultant porous structures pro-hibited synthesizing CS/PVA membranes with higher porogen contents. Desorption tests showed that theporous membranes were better regenerated in comparison to the dense membranes using Na2EDTA aseluant. Generally, the results suggested that the CS/PVA membranes, comprising PEG as pore-generatoragent, are potential candidates for adsorption and elimination of Cu(II) ions from water.
کلید واژگان :Membrane adsorbent, Chitosan, Poly(ethylene glycol), Porogen, Macrovoida
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک