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Adsorption characteristics of citric acid on Fe3O4 (001), (011), and (111) surfaces

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Abstract

Magnetite (001), (011), and (111) surfaces were the focus of our study. Magnetite (001) surface has two different terminations, that is, Fetet and 2Feoct4O. Magnetite (011) surface has two different terminations, that is, 2Feoct4O and 2Fetet2Feoct4O. Magnetite (111) surface has six different terminations, that is, Fetet1, Feoct, Fetet2, 3Feoct, 4O1, and 4O2. Comparing surface energies of (001), (011), and (111) surfaces, (001) has the smallest surface energy, and (111) has the largest surface energy except for Feoct termination, which means that (001) surface is the easiest to be cleaved, followed by (011) and (111) surfaces. Comparing adsorption energies of citric acid onto (001), (011), and (111) surfaces, (111) has the largest adsorption energies except for Fetet2 termination, and (001) has the smallest adsorption energies, which means that (111) surface is the most active for citric acid adsorption, followed by (011) and (001) surfaces. PDOS (partial density of states) of citric acid adsorbed onto (001), (011), and (111) surfaces with different terminations shows that 3d orbital of Fe of magnetite surface does not contribute to the adsorption, and 4s orbital of Fe of magnetite surface and 2s and 2p orbitals of O of citric acid contribute to the adsorption.

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Acknowledgements

The simulation has been carried out on the HP Blade System c7000 (HP BL460c) that is owned and managed by Faculty of Materials Science, Kim Il Sung University.

Code availability

All the calculations were performed by using siesta-4.1-b3 package.

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Authors and Affiliations

  1. High-Tech Research and Development Center, Kim Il Sung University, Pyongyang, Democratic People’s Republic of Korea

    Mun-Hyok Ri & Yong-Nam Kim

  2. Faculty of Physics, Kim Il Sung University, Pyongyang, Democratic People’s Republic of Korea

    Un-Son Ri & Yun-Sop Sin

  3. Faculty of Physics, Pyongyang University of Transport, Pyongyang, Democratic People’s Republic of Korea

    Myong-Jun Chon

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  1. Mun-Hyok Ri
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The first draft of the manuscript was written by Mun-Hyok Ri, and all authors commented on previous versions of the manuscript.

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Correspondence to Mun-Hyok Ri.

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Ri, MH., Ri, US., Kim, YN. et al. Adsorption characteristics of citric acid on Fe3O4 (001), (011), and (111) surfaces. J Mol Model 27, 332 (2021). https://doi.org/10.1007/s00894-021-04950-7

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  • DOI: https://doi.org/10.1007/s00894-021-04950-7

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