سنتز و شناسايي چارچوب هاي آلي كووالانسي و بررسي كارايي آنها در جذب رنگ و سنتز كرومن ها

Synthesis an‎d characterization of covalent organic frameworks investigation of their efficiency in dye adsorption an‎d chromene synthesis

شيمي آلي و پليمر

In the first part of this study, a covalent organic framework (COF) was designed an‎d synthesized. It was then characterized using FT-IR, XRD, BET, TGA, FE-SEM, HR-TEM, an‎d XPS techniques. The COF was subsequently applied as a dye adsorbent to eva‎luate its efficiency in the adsorption of Methylene Blue, Methyl Orange, an‎d Neutral Red dyes, representing cationic, anionic, an‎d neutral dyes, respectively. The results indicated that the synthesized COF exhibited adsorption capacities of 108, 184, an‎d 428 mg/g for Methylene Blue, Methyl Orange, an‎d Neutral Red, respectively, suggesting its potential as an efficient an‎d reusable adsorbent. Moreover, the selec‎tivity of the COF was eva‎luated, an‎d the results showed that it has higher affinity for the neutral dye (Neutral Red) compared to the cationic dye (Methylene Blue), an‎d also a stronger affinity for the anionic dye (Methyl Orange) than for the cationic dye (Methylene Blue). In the second part of the study, through structural modification, the TAPT-HMIPA COF was functionalized using 1, 3-propane sultone. It was then characterized using FT-IR, XRD, BET, TGA, FE-SEM, an‎d CHNS techniques. This modified COF was applied as a catalyst in the synthesis of heterocyclic compounds 4-imino-2-(phenylamino)-4H,5H-pyrano[3,2-c]chromen-‎-ones. The results showed that the reactions proceeded efficiently under mild an‎d green conditions with high yields, indicating that the modified COF possessed excellent catalytic activity as well as recyclability an‎d reusability.

4