Synthesis and Characterization Of Bismuth (Iii) Iodotungstate, an Exchanger

Abstract

A number of samples of Bismuth(III) iodotungstate were prepared by mixing the solutions of Bismuth nitrate, Potassium iodate and Sodium tungstate in varying ratios. One of the samples was selected for study because the ion exchange capacity and the yield of the exchanger was found to be satisfactory. The characterization of the exchanger included the determination of the ion exchange capacity of the exchanger by downflow column method and P H titration method. Both the methods exhibited the ion exchange capacity to be 1.0 meq/g. Further studies included the study of IR, TGA, XRD and Distribution studies. IR of the exchanger indicated the presence of the expected components of the exchanger. Thermal gravimetric analysis has clearly shown the loss of weight of exchanger due to the loss of water molecules & other components at different temperatures. X-Ray diffraction pattern proved the exchanger to be amorphous in nature. Chemical stability of the exchanger was studied in different acid and base solutions of different concentrations. The exchanger was heated at different temperatures and after every heating the ion exchange capacity of the exchanger was determined. This shows the decline in the ion exchange capacity on increasing the temperature. Kd values for different metals ion were determined and found the maximum value for Ni ++. Where as minimum value was found to be for Zn ++ . The results appeared to be satisfactory.