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Periodic mesoporous titania with anatase and bronze phases-the new generation photocatalyst: Synthesis, characterisation, and application in environmental remediation
, Vatti S.K., , Raj R.P.
Published in Royal Society Of Chemistry
Volume: 44
Issue: 38
Pages: 16269 - 16284
High-quality 2D-hexagonal ordered mesoporous titania with a well-crystallized framework structure and a high surface area was successfully synthesized, in a reproducible way, using Pluronic F127, Pluronic P123, Synperonic F108 and CTAB as structure-directing agents, and the resulting nanostructured matrix is designed as TMF-127, TMP-123, TMF-108 and TMC-016/TMC-036, respectively. The periodic array of the pore structure of these mesoporous materials is described by combining small-angle X-ray diffraction, high-resolution transmission electron microscopy and nitrogen sorption techniques. All these materials show significant amounts of intrinsic defects, viz., electrons trapped in oxygen vacancy and/or Ti3+ centres, by tuning the pore structure. These defects in-turn promote the charge separation of photogenerated excitons, and therefore exhibit excellent photocatalytic activity for the degradation of famotidine (TMP-123: DE100 = 75 min; P-25: DE100 = 120 min), and 4-chlorophenol (TMP-123: DE95 = 180 min; P-25: DE60 = 180 min). The superior activity of the mesoporous titania over the fumed titania (P-25) is ascribed to: (i) light absorption extending into the visible region, (ii) low charge-transfer resistance and high carrier density, and (iii) intrinsic Ti3+ defects, as deduced from DRUV-Visible, photo-electrochemical (Nyquist and Mott-Schottky) and EPR studies, respectively. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
About the journal
JournalData powered by TypesetNew Journal of Chemistry
PublisherData powered by TypesetRoyal Society Of Chemistry
Open AccessNo