EDTA-Like Chelating Cellulose for Adsorption of Cadmium and Lead Ions
To improve the adsorptive performances of cellulose for heavy metals,in this work,microcrystalline cellulose was chemically oxidized to dialdehyde cellulose by sodium metaperiodate.Chelating cellulose functionalized with multidentate N,O-donor atoms(EDTA-CL)was prepared through Schiff base reaction between ethylenediamine and dialdehyde cellulose,and a substitution reaction between bromoacetic acid and amino groups derived from ethylenediamine,characterized to test the morphology and structure,and tested the adsorptive performances of heavy metals from aqueous solution.The optimal experimental conditions of the Cd2+ and Pb2+ adsorption by EDTA-CL(optimal pH in the range of 4.5～6 and rapid uptakes within 20 min)are found.The adsorptive amounts of Cd2+ and Pb2+ by EDTA-CL at 30℃are found to be 236.1 mg/g and 382.6 mg/g,respectively,suggesting the enhancement of adsorptive amounts of EDTA-CL for Cd2+ and Pb2+ due to the grating of multidentate N,O-donor atoms on the cellulose skeleton.The adsorption of EDTA-CL for Cd2+ and Pb2+ follows the Langmuir and pseudo second-order models.EDTA-CL can be regenerated and reusable.
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