In this thesis, considering the importance of covalent organic frameworks in many applications, including drug delivery, absorption of pollutants, supercapacitors, batteries, and other industrial applications, the new imine-based covalent organic frameworks were designed and synthesized through Schiff-base condensation reaction using the solvothermal and compression synthesis methods. In the first part of this thesis, the N-riched TCOF covalent organic framework was synthesized using the solvothermal method in the presence of n-butanol, o-dichlorobenzene solvents, and acetic acid as a catalyst, and then the synthesized N-riched TCOF was investigated as a DFS -4BS dye adsorbent. To optimize the adsorption conditions, the experimental design model was used. Also, in order to determine the color concentration in each step, a mobile phone colorimetric technique was used. The obtained results showed a very high adsorption capacity of 8501 mg g-1 in optimal conditions: temperature, 35 ?; pH, 2; the amount of adsorbent, 10 mg; and the contact time, 360 min. In the second part, the ability of synthesized N-riched TCOF to remove the toxic and carcinogenic mercury ions was investigated. To determine the concentration of mercury ions in each step, in the first, the colorful complex of Hg2 #43;-diphenylcarbazone was formed and the concentration of mercury ions in each solution was measured using a handmade colorimeter. The adsorption capacity under optimal conditions: temperature, temperature; 25 ?; pH, 7; the amount of adsorbent, 10 mg, and the contact time, 480 min was obtained 1826 mg g-1. In the third part, the new IC-COF framework was synthesized by an environmentally friendly method using water as the reaction medium under mild conditions. The synthesized compound was then used to prepare a fluorescence sensor for phosphate ions. The results showed that the designed sensor is able to detect phosphate ions in the linear range of 0 to 37 µM and in the presence of other ions selectively. In the fourth section, to investigate the possibility of using this group of porous polymers to solve one of the industrial challenges of polymeric materials, the FT-COF covalent organic framework with chlorine atoms was designed and synthesized, and loaded in commercial TPU polymer substrate as a flame retardant. The results showed that the maximum heat release rate and the total heat release in the presence of only 3% by weight of FT-COF compared to pure TPU, decreased by 51.6% and 47.3%, respectively.