حذف آلاينده‌هاي رنگي از آب به وسيله نانوالياف‌هاي حاوي چهارچوب‌هاي فلز آلي كبالت، آهن و مس

Removal of dye pollutants from aqueous solution by nanofibers including cobalt, Iron an‎d Copper metal organic frameworks

شيمي معدني

In this project, due to the unique characteristics of metal-organic frameworks, these materials have been selec‎ted as adsorbents. Metal-organic frameworks have an excellent potential to absorb dyes, but because they are in powder form, it is very difficult to reusability an‎d separate them from dye solution. When metal-organic frameworks are placed on polymer nanofibers, this problem is solved. The combination of metal-organic frameworks with polymers improves flexibility an‎d chemical stability. In this research, ZIF-67 an‎d MIL-88A were synthesized by green methods without using toxic solvents an‎d placed on ethyl cellulose fibers. These nanocomposites used for congored adsorption an‎d time, adsorbent dosage, dye concentration, pH an‎d temperature were optimized. In optimal conditions, EC/ZIF-67 had 99.8% an‎d EC/MIL-88A about 91% dye adsorption after 50 minutes. Then copper aspartic acid an‎d copper glutamic acid were also synthesized an‎d placed on polyvinyl alcohol fibers. These composites were used for the adsorption of congored an‎d methylene blue an‎d time, adsorbent dosage, dye concentration, pH an‎d temperature were optimized. In optimal conditions, after 40 minutes, PVA/Cu-asp has 90% adsorption for both dyes an‎d PVA/Cu-glu has about 80% adsorption for congored an‎d 75% adsorption for methylene blue. Kinetic an‎d thermodynamic parameters were studies for all synthesized composites. In order to investigate the adsorption kinetics, pseudo-first-order, pseudo-second-order, intera-particular diffusion an‎d Elovich model were studied. Also, to investigate the reaction mechanism, Langmuir, Freundlich, Temkin an‎d D-R models were studied. These synthesized MOFs an‎d composites were characterized an‎d identified by various techniques such as TGA, BET, EDX, ICP, FE-SEM, XRD, FTIR.

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