In the first step of this research, three triazine-based porous organic frameworks (T-POFs) were synthesized via Friedel-Crafts and nucleophilic substitution reaction conditions. Two microporous covalent triazine-based frameworks (CTFs) with fluorene (Flu-CTF) and triphenylmethane (TPM-CTF) were synthesized through a simple and mild Friedel-crafts reaction approach, which led to the formation of nanoporous layered structures. In addition, a covalent organic polymer with 1,5-diaminonaphthalene (DAN-COP) was synthesized via nucleophilic substitution of cyanuric chloride. The porous organic frameworks obtained were fully characterized by FT-IR, PXRD, FE-SEM-EDX, AFM, TEM, TGA, UV-Vis, CO2 adsorption isotherm, and elemental analysis. Micropore surface area of 844 m2g–1 was estimated according to the obtained results from CO2 adsorption isotherm of Flu-CTF. In the second part of this thesis, two types of modified nanoporous silica was prepared by post-synthesis route. Phenyl-functionalized mesoporous SBA-15 and KCC-1 were characterized by FT-IR, PXRD, FE-SEM, TEM, and N2 adsorption isotherm. Finally, in further attempt for grafting covalent organic frameworks (COFs) on surface of phenyl-functionalized nanoporous silica, the Friedel-Crafts reaction was selected as a simple and effective route. The porous organic frameworks were coupled and grown uniformly on functionalized silica to prepare extended combined porous structure. The as-synthesized porous organic-inorganic composites with the above-mentioned method are the first report on the growing of the COFs on porous silica structures via Friedel-Crafts approach, which were fully characterized by FT-IR, PXRD, FE-SEM-EDX, AFM, TEM, TGA, UV-Vis, and elemental analysis.