Determination of the roles of FeIII in the interface between titanium dioxide and montmorillonite in FeIII-doped montmorillonite/titanium dioxide composites as photocatalysts
Source abstract
Abstract
Fe/Mt./TiO 2 with Fe III cation doped on montmorillonite (Mt) and, Mt./Fe-TiO 2 with Fe III cation doped on TiO 2 were synthesized at three temperatures. Compared with the influence from the position of Fe III, the synthesis temperature had moderate interference on the TiO 2 formation as was implied by X-ray fluorescence (XRF) and X-ray diffraction (XRD). Characterizations of diffuse reflectance UV–vis spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS) indicated the more excellent photocatalytic property of Fe/Mt./TiO 2 composite than Mt./Fe-TiO 2 composite. The energy-resolved distribution of electron traps (ERDT) pattern revealed a distinguished phase composing from the surface to the bulk for both Fe/Mt./TiO 2 and Mt./Fe-TiO 2 and demonstrated almost the same photocatalytic property of the TiO 2 particle surface on both Fe/Mt./TiO 2 and Mt./Fe-TiO 2 . The photocatalytic activities test for phenol decomposition on Fe/Mt./TiO 2 was better than Mt./Fe-TiO 2 which is consistent with the DRS, PL, photocurrent, and EIS results. A heterojunction between the Mt. and TiO 2 in Fe/Mt./TiO 2 was proposed to explain the inconsistency of the photocatalytic property and photocatalytic performance for the two composites and the consistency of the photocatalytic property for the surface of TiO 2 particles on the composites. To increase the photocatalytic activity of Fe/Mt./TiO 2 , the electron at the Fermi level on Fe III-doped Mt. may be coupled with the hole on the valance band of TiO 2, resulting in effective separation of electron and hole and reduction and/or avoidance of recombination.
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Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques · Advanced oxidation water treatment
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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