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Sio2 xps peak1/6/2023 ![]() XPS spectra reveal that the adsorption takes place between the nitrogen atom of the dimethylamino groups in MB and silanols on α-quartz and α-cristobalite surfaces. The adsorption capacity of α-quartz toward MB is larger than that of α-cristobalite, which positively correlates with the density of surface site. The Langmuir adsorption isotherms suggest the formation of monolayer MB on both α-quartz and α-cristobalite surfaces. ![]() The surface properties of two common crystalline SiO 2 polymorphs, i.e., α-quartz and α-cristobalite, have been investigated by the surface site density measurement, batch methylene blue (MB) adsorption, and X-ray photoelectron spectroscopy (XPS). The diversity of the SiO 4 tetrahedron polymerization style might result in the heterogeneity of the surface microstructures and properties of SiO 2 polymorphs. Silica minerals, one of the most abundant mineral species on the earth, play important roles in geochemistry and environment processes.
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