二三のポリビニルアルコール誘導体のHg^2+,Cd^2+吸着能

概要

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To obtain polymers able to capture heavy metal ions like Hg^ or Cd^ in water, functional groups having affinity for such metal ions were introduced in polyvinyl alcohol chain. Thiol group and -NH (RCOOH) group were selected as such functional groups. Several methods were carried out for introduction of the functional groups. (1) Some halogenoacetals of polyvinyl alcohol are treated with NaSH. (2) After the halogenoacetals are treated with Na_3Sx, the products are reduced by NaHSO_3. From (1) and (2) polyvinyl alcohol derivatives containing SH group are obtained. (3) Aminoacetals of polyvinyl alcohol synthesized by the reaction between polyvinyl alcohol and aminoacetals are treated with monochloroacetic acid. (4) polyvinyl alcohol is acetalized by aminoacetal containing carbonic acid group. From (3) and (4) polyvinyl alcohol containing NH_2 group and carbonic acid in the former' s neighbourhood is obtained.　Adsorption capacity of these polymers for Hg^ and Cd^ in aqueous solution was examined. Among them, polymers obtained by method (3) show the strongest adsorption capacity for Hg^, then polymer obtained by method (1) follows. Polymers obtained by method (1) and (3) also show fairly strong adsorption capacity for Cd^. The capacity of the former polymer is somewhat stronger for Cd^ than for Hg^ but that of the latter polymer is fairly less for Cd^ than for Hg^.
山形大学の論文
1983-01-20