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.
[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
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