Pure polyaniline and pure and copper, nitrogen doped TiO2¬¬/Polyaniline nanocomposites have been successfully synthesized by in-situ oxidative of aniline in aqueous media containing pure or doped TiO2 nanoparticles. The as-prepared materials were characterized by TGA, XRD, FT-IR, BET and TEM. The samples obtained have been utilized as an adsorbent for the removal of methyl orange from aqueous solution. The effect of particular significant parameters such as pH, dye initial concentration and contact time on the elimination efficiency was examined in batch experiments. The equilibrium sorption data on Ti/PANI composite were matched into Langmuir, Freundlich and Temkin isotherms, and their parameters were fixed of the three adsorption isotherms. It is found that the R2 value of Langmuir isotherm model was the highest with a maximum removal of 94% was obtained at pH of 7 for an adsorbent dose of 0.1 g/100 mL. The kinetic data were corresponded to several models and were found to follow closely the pseudo-second order model for both components. Results obtained indicate that PANI and its TiO2 or (Cu or N)TiO2/polyaniline nanocomposites could be used as an effective adsorbent significantly more than the PANI powder for dye deletion from water. |
