CTE / Proceedings 2025 / The XPS-Revealed Difference in the Molecular Sorption Mechanism of Se(IV) and Se(VI) on Mg-Al-CO3 Layered Double Hydroxides (LDHs) Focusing on the Material Surface Speciation

The XPS-Revealed Difference in the Molecular Sorption Mechanism of Se(IV) and Se(VI) on Mg-Al-CO3 Layered Double Hydroxides (LDHs) Focusing on the Material Surface Speciation

DOI: https://doi.org/10.23939/cte2025.01.446
Ecology and Sustainable Development. Environmental Protection
pp.
446-451
Abstract

This paper extends the previous work on the EXAFS-derived mechanism of Se(IV)/Se(VI) adsorption on Mg-Al-CO3 LDHs synthesized by the original method and uses XPS surface analysis to determine the material phases, responsible for these anions removal. A new methodological idea is suggested how to distinguish chemisorption and physisorption by XPS. 

Keywords (in English)
X-ray photoelectron spectroscopy (XPS)
Mg-Al-CO3 Layered double hydroxides (LDHs)
selenate
selenite
chemisorption
physisorption
Author (co-authors)
First name Last name Institutional affiliation E-mail Phone number ORCID ID Academic status, position Institution address Author contribution(s) Institutional affiliation
Natalia
Chubar
natalia.chubar@gmail.com
0000-0001-7408-0355
Associate Professor
9 Dorohozhytska Str., Kyiv, 04112, Ukraine
Conceptualization
Data Curation
Formal Analysis
Funding Acquisition
Investigation
Methodology
Project Administration
Visualization
Writing – Original Draft Preparation
Writing – Review & Editing
Validation
Shupyk National Healthcare University of Ukraine
References

[1] Chubar, N. (2011). New inorganic (an)ion exchangers based on Mg–Al hydrous oxides: (Alkoxide-free) sol–gel synthesis and characterization. Journal of Colloid and Interface Science, 357(1), 198–209. DOI: 10.1016/j.jcis.2011.01.098

[2] Chubar, N. (2014). EXAFS and FTIR studies of selenite and selenate sorption by alkoxide-free sol-gel generated Mg-Al-CO3 layered double hydroxide with very labile interlayer anions. Journal of Materials Chemistry A, 2, 15995–16007. DOI: 10.1039/C4TA03463E

[3] Chubar, N. (2018). The influence of sulfate on selenate sorption on Mg-Al-CO3 layered double hydroxides prepared by fine inorganic sol-gel synthesis studied by X-ray photo-electron spectroscopy. Applied Surface Science, 459, 281–291. DOI: 10.1016/j.apsusc.2018.07.193

[4] Chubar, N. (2023). XPS determined mechanism of selenite (HSeO3−) sorption in absence/presence of sulfate (SO42−) on Mg-Al-CO3 Layered double hydroxides (LDHs): Solid phase speciation focus. Journal of Environmental Chemical Engineering, 11(3), 109669. DOI: 10.1016/j.jece.2023.109669

Manuscript file
xps-revealed-difference-molecular-sorption-mechanism-seiv-and-sevi-mg-al-co3-layered-double.docx6.14 MB