A combined molecular dynamic simulation, DFT calculations, and experimental study of the eriochrome black T dye adsorption onto chitosan in aqueous solutions

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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Khnifira M., Boumya W., Abdennouri M., Sadiq M., Achak M., Serdaroğlu G., Kaya S., Şimşek S., Barka N.

Publisher: Elsevier: 12 months

Publication year: 2021

Journal: International Journal of Biological Macromolecules (0141-8130)

Volume number: 166

Start page: 707

End page: 721

Number of pages: 15

ISSN: 0141-8130

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85095580479&doi=10.1016%2fj.ijbiomac.2020.10.228&partnerID=40&md5=782097e2d3b08eba48f42180a7fc69e7

Languages: English (EN-GB)

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This study aims to evaluate and understand the adsorption of eriochrome black T (EB) by chitosan extracted from local shrimp shells under different experimental conditions. Chitosan samples were characterized by XRD, SEM, and FTIR. Experimental results indicate that the process was pH-dependent with a high adsorption capacity in acidic medium. The adsorption was rapid and kinetic data were suitably correlated to the pseudo-second-order kinetic model. EB molecules were adsorbed on monolayer according to the Langmuir model with an adsorption capacity of 162.3 mg/g. On the other hand, it should be noted that calculated quantum chemical parameters support the experimentally obtained results. The interaction energies calculated for (molecule/chitosan) complexes were in the order of H2EB− > HEB2− (O38) > HEB2− (O48) > EB > H3EB > EB3−, which means that the best and possible adsorption process can take place with H2EB− form. The molecular dynamics (MD) approach was performed to illuminate the nature of the relationship between the EB and the chitosan (110) surface. It was found that the chitosan (110) surface adsorbs EB molecule in a nearby parallel orientation. The higher negative adsorption energy determined for the H2EB− implies that the adsorption mechanism is the typical chemisorption. © 2020 Elsevier B.V.


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Last updated on 2021-21-06 at 23:16