Synthesis of new superabsorbent poly (NIPAAm/AA/N-allylisatin) nanohydrogel for effective removal of As(V) and Cd(II) toxic metal ions

The present studies highlight the effective removal of As(V) and Cd(II) from aqueous solutions by superabsorbent poly (NIPAAm/AA/N-allylisatin) nanohydrogel. Batch removal studies were performed as a function of treatment time, initial metal ion concentration, pH, and adsorbent dose. TEM micrographs confirm the particle size distribution in the range between 5 nm and 10 nm. The simple and metal ions adsorbed nanohydrogels were characterized by FT-IR, TGA, and EDX analysis. Finally, the equilibrium removal efficiency of the nanohydrogel was analyzed according to the Langmuir and Freundlich adsorption isotherm models which showed the removal of As(V) and Cd(II) metal ions fitted to Freundlich and Langmuir isotherms, respectively. Removal efficiency order of the metal ions is As(V) > Cd(II).

Superabsorbent poly (NIPAAm/AA/N-allylisatin) nanohydrogels have been synthesized by inverse microemulsion polymerization and their As(V) and Cd(II) metal ions removal efficiency from aqueous solutions have been investigated. From the batch removal studies, it is revealed that nanohydrogel was able to remove ∼94% of As(V) and ∼83% of Cd(II) metal ions from water.Figure optionsDownload as PowerPoint slide