Adsorption Performance of Polyethyleneimine Modified Polyurethane Foam on Methyl Orange and Alizarin Red
Polyethyleneimine modified polyurethane foam(PEI-PUF)was prepared and the synthesis conditions were studied.PEI-PUF was employed for adsorption of methyl orange and alizarin red from aqueous solution.The results are as follows.The equilibrium time was 60 min and pesudo-first-order could describe the adsorption kinetics of methyl orange and alizarin red by PEI-PUF-30 better.The adsorption amount was high at acidic condition for adsorption of methyl orange and alizarin red.With the increase of pH,the adsorption amount decreased.The adsorption amount of methyl orange by PEI-PUF-30 was high over wide pH range(pH<9.8).Freundlich model fitted the adsorption data well.The maximum adsorption capacities of methyl orange and alizarin red were 128.28 and 98.76 mg·g-1,and PEI-PUF-30 showed high affinity to methyl orange.The adsorption amount of methyl orange and alizarin red by PEI-PUF-30 increased with the temperature increase,which indicated that the adsorption process was endothermic.
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