SORPTION PROPERTIES OF CATION EXCHANGERS OBTAINED BY TREATMENT OF SPRUCE SAWDUST WITH SULFURIC ACID SOLUTION
Abstract
A process for producing cation exchangers from wood materials, comprising a heat treatment under vacuum sawdust impregnated with an aqueous solution of sulfuric acid, with simultaneous distillation of the excess and reaction water is proposed. The target product (yield – 66–68%) is polyfunctionalcation exchangers containing strongly and weakly acid groups. The influence of the concentration of sulfuric acid used for impregnation of sawdust in the range of 4,4–56,0% on ion-exchange properties of the resulting cation exchangers is studied. The content of acid groups in the cation exchangers with increasing concentration of acid increases, and at a concentration of 56% reaches value 4.6 mmol/g. The sorption of cation heavy metal ions is studied. The maximum capacity for the elements of the sorbents in ionized form increases in the sequence (mmol/g): Ni (1,71) > Co (1,78) > Cu (1,83) > Pb (2,16).
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