Removal of some most hazardous cationic dyes using novel poly (NIPAAm/AA/N-allylisatin) nanohydrogel

Synthesis of nanoparticles by microemulsion method is an interesting research area of current years. By accepting this opinion, N-isopropylacrylamide was polymerized with different amounts of acrylic acid (AA) and N-allylisatin using aerosol (AOT) as a surfactant, ethylene glycol dimethacrylate (EGDMA) as a cross linker and 2,2′-azobisisobuteronitrile (AIBN) as a surface active initiator. The chemical structure of nanohydrogel was characterized by FT-IR, DSC and TGA analysis. SEM photographs demonstrate the surface morphology of nanohydrogel before and after the dye adsorption. TEM micrographs confirm the particle size distribution in the range between 5 and 10 nm. Specific surface area and pore volume of the synthesized nanohydrogel were determined by BET and BJH analysis. The nanohydrogels were used in experiments on swelling behavior and adsorption of some water-soluble cationic dyes such as Methylene Blue (BB-9), Auramine O (BY-2) and Chrysoidine G (BO-2). Furthermore, the Langmuir and Freundlich adsorption isotherm models were applied which showed a favorable adsorption. From the results, removal of dyes within the nanohydrogel increased in the following order: BB-9 > BY-2 > BO-2.