International Journal of New Chemistry
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Investigating the performance of a recently synthesized covalent organic framework as an adsorbent for methylene blue: A DFT Study

Document Type : Research Paper

Authors

Raheleh Farahani
Tayyebeh Madrakian
Abbas Afkhami

Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran

https://doi.org/10.22034/ijnc.2023.706008
Abstract
Methylene blue (MB) is an organic dye that is widely used in various industries and have different adverse effects on the environment. Therefore, its removal is of great importance. In this respect, the performance of a recently synthesized schiff base network1 (SNW1) as an adsorbent for the removal of MB was scrutinized by DFT computations. For this purpose, the structures of MB, SNW1 and their complexes were optimized geometrically and the underwent infra-red (IR) calculations. All of the computations were done by density functional theory approach in the B3LYP/6-31G (d) level of theory. The obtained negative adsorption energies showed MB interaction with SNW1 is experimentally possible. The achieved negative values of Gibbs free energy changes and adsorption enthalpy changes revealed the MB adsorption process is exothermic and spontaneous. The positive values of entropy alterations and thermodynamic equilibrium constants demonstrated that the adsorption process of MB is thermodynamically possible and the chaos is increased in their interaction process.

Keywords

Methylene blue
Covalent organic framework (COF)
Density Functional Theory
Adsorption
Subjects
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International Journal of New Chemistry
Volume 9, Issue 4
Summer 2022
Pages 383-392

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