Synthesis of cross-linked graft copolymer hydrogel from maleic acid, poly(vinyl alcohol) and methylene bisacrylamide, and studies on its efficiency in uptaking zinc ion from aqueous solution

摘要

A novel graft copolymer hydrogel from maleic acid and poly(vinyl alcohol) has been synthesized and it is cross-linked by methylene bisacrylamide for the investigation of its efficiency in uptaking zinc ion from aqueous solution. The swelling behavior, temperature sensitivity, gel content and swelling rate of the hydrogel were investigated. Metal ion uptake capacity of the polymer was evaluated in the light of changing pH, temperature, time and concentration. The polymer was characterized by chemical, thermal (TGA) and spectral (FTIR) data analysis. Surface morphology was inspected with the help of SEM photograph. A plausible mechanism for zinc ion exchange has been suggested. The selectivity of the polymer towards metal ion has been investigated. Zinc ion has been isolated quantitatively from various synthetic mixture containing metal ions (Ni~(2+), Cd~(2+), Cu~(2+)), commonly found in the effluent of galvanization industry.