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A Benign Approach of Microwave Assisted Synthesis of Copolymeric Resin with Improved Thermal, Spectral and Ion-exchange Properties

Shah Bhavna A. نويسنده , Shah Ajay V. نويسنده , Patel Nayan B. نويسنده

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Microwave irradiation (2.46 GHz, 300 W) was utilized to produce salicylic acidformaldehyde-resorcinol (SFR-M) chelating resin in DMF media at 80±2°C with ecofriendly approach involving shorter time as compared to conventional method. The resultinq resin was characterized by FTIR, 1H NMR, and elemental analysis. The investigation of the surface characteristics of the resin was carried out by examination of resin morphology using scanning electron microscopy (SEM) at different magnifications. Broido and Horowitz-Metzger methods were used to calculate the energy of activation (Ea) from TGA. The chelating properties of synthesized resin such as total ion-exchange capacity, effect of pH, concentration and time for different metal ions Ni (II), Cu (II), Zn (II), Cd (II) and Pb (II) were also studied by employing batch equilibrium method. The quantitative separations of metal ions from binary [Ni(II)-Cd(II)] and ternary [Ni(II)-Zn(II)-Cd(II)] synthetic mixtures were performed by column chromatography at 25±2°C. The constituents of brass were also analyzed by selective sorption on column at optimized distribution coefficient (Kd) values. Microwave assisted chelating resin is specific for transition metal ions rather than selective as compared with the resin synthesized by conventional method.

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