In the firs part of this project, 4,4¢-((6-morpholino-1,3,5-triazine-2,4-diyl) bis (azanediyl) dibenzoic acid as a diacid monomer as a novel diacid was prepared by the reaction of 2,4-dichloro-6-morpholino-1,3,5-triazine and 4-aminobenzoic acid and characterized by FT-IR, elemental analysis, 1 H-NMR and 13 C-NMR spectroscopic methods. Then, some new aromatic polyamides (PAs) were synthesized by condensation polymerization of diacid and different aromatic diamines. For this purpose, optimized conditions in term of reaction time and temperature were studied and the influence of the time of reaction on the inherent viscosity and the yield of the PAa were examined. According to these results the optimum condition was selected for the synthesis of the other PAs. The resulting PAs exhibited good yields, high thermal stability with inherent viscosities ranging between 0.22 and 0.28 dL/g and was soluble in polar aprotic solvents such as DMSO, DMAc, NMP and DMF. The synthetic polymers were characterized by FT-IR, 1 H-NMR, elemental analysis, thermogravimetric analysis (TGA), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). In the second part of the project, in order to improve the properties of polymer, NCs were synthesized base on 1,3-phenylenediamine and TiO 2 and ZnO . For the improvement of TiO 2 and ZnO dispersion and enhancing interactions between nanoparticles and polymeric matrix, the surface of TiO 2 and ZnO were successfully modified by 1,3,5-triazine based silane coupling agent. The synthesized NCs were characterized by various techniques including FT-IR and X-ray diffraction )XRD( and their morphology was investigated by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). Morphological studies revealed that were dispersed in polymer matrix without any aggregation The TGA of the obtained NCs proves the enhancement in the thermal stability with an increase in the percentage of zinc and titanium oxide nanoparticles. In the third part of the project, polyamide based 1,3-phenylenediamine and synthesized NC were used for removal of Cr(VI) from aquase soloution. Then parameters including pH, contact time and concentration of salt were optimaized. Also, the sorption kinetics and isotherm of these sorbents were investigated.