Silicic acid adsorption and oligomerization at the ferrihydrite-water interface: interpretation of ATR-IR spectra based on a model surface structure

Langmuir : the ACS Journal of Surfaces and Colloids
Peter J SwedlundA James McQuillan

Abstract

Oxide surfaces can promote specific lateral interactions between adsorbed species that become concentrated in specific orientations at an interface. In this article, in situ attenuated total reflectance (ATR) IR spectra were collected over time (from 0 to approximately 100 h) as the iron oxide ferrihydrite reacted with H(4)SiO(4) (between 0.007 and 1.65 mM) and at a pH of 4, 7, or 10. Under all conditions, the first product formed was a monomeric surface species with distinct bands at 945 and 880 cm(-1), and a bidentate (2)C complex with SiO(4) sharing corners with two edge-linked Fe octahedra was proposed. Once a certain surface concentration (Gamma(Si)) of monomers was reached, a condensed oligomeric surface species with Si-O-Si linkages was observed on the surface with bands at 1005, 917, and 827 cm(-1) and one or more bands at >1050 cm(-1). This species was observed as a minor surface component at Gamma(Si) that was up to 10 times lower than the calculated density of (2)C adsorption sites on ferrihydrite and became the dominant surface species at higher Gamma(Si). This formation of a specific oligomer is rationalized on the basis of a recent model for the ferrihydrite surface, with the arrangement of (2)C adsorption sites o...Continue Reading

References

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Citations

Nov 11, 2014·Applied Geochemistry : Journal of the International Association of Geochemistry and Cosmochemistry·Xiaodong GaoJon Chorover
May 31, 2011·Environmental Science & Technology·Soumya DasJoseph Essilfie-Dughan
Nov 21, 2012·Environmental Science & Technology·Iso ChristlRuben Kretzschmar
Nov 14, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Yantao SongJames B Metson
Apr 16, 2015·Environmental Engineering Science·Binod Kumar Chaudhary, James Farrell
Aug 10, 2016·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Nenad StevicMiroslav Nikolic
Jul 16, 2016·Open Forum Infectious Diseases·Catherine YuMari-Lynn Drainoni
Sep 5, 2019·Environmental Science and Pollution Research International·Hilla ShemerRaphael Semiat
Jan 27, 2019·Scientific Reports·Jörg SchallerBo Elberling
Jul 10, 2020·Scientific Reports·Thimo KlotzbücherRobert Mikutta
Jul 2, 2021·Bulletin of Environmental Contamination and Toxicology·Qun ZhaoPing Ning
Jan 6, 2018·Environmental Science & Technology·Masakazu KanematsuJean-François Boily
Oct 23, 2020·Environmental Science & Technology·Ying LiYuji Arai

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