| Title: | Surface-Enriched Boron-Doped TiO(2) Nanoparticles as Photocatalysts for Propene Oxidation |
| Author(s): | Cano-Casanova L; Anson-Casaos A; Hernandez-Ferrer J; Benito AM; Maser WK; Garro N; Lillo-Rodenas MA; Roman-Martinez MC; |
| Address: | "Grupo Materiales Carbonosos y Medio Ambiente, Departamento de Quimica Inorganica e Instituto Universitario de Materiales (IUMA), Facultad de Ciencias, Universidad de Alicante, Ap.99, E-03080 Alicante, Spain. Instituto de Carboquimica, ICB-CSIC, Miguel Luesma Castan 4, 50018 Zaragoza, Spain. Institut de Ciencia dels Materials (ICMUV), Universitat de Valencia, 46980 Paterna, Valencia, Spain" |
| ISSN/ISBN: | 2574-0970 (Electronic) 2574-0970 (Linking) |
| Abstract: | "A series of nanostructured boron-TiO(2) photocatalysts (B-X-TiO(2)-T) were prepared by sol-gel synthesis using titanium tetraisopropoxide and boric acid. The effects of the synthesis variables, boric acid amount (X) and crystallization temperature (T), on structural and electronic properties and on the photocatalytic performance for propene oxidation, are studied. This reaction accounts for the remediation of pollution caused by volatile organic compounds, and it is carried out at low concentrations, a case in which efficient removal techniques are difficult and costly to implement. The presence of boric acid during the TiO(2) synthesis hinders the development of rutile without affecting the textural properties. X-ray photoelectron spectroscopy analysis reveals the interstitial incorporation of boron into the surface lattice of the TiO(2) nanostructure, while segregation of B(2)O(3) occurs in samples with high boron loading, also confirmed by X-ray diffraction. The best-performing photocatalysts are those with the lowest boron loading. Their high activity, outperforming the equivalent sample without boron, can be attributed to a high anatase and surface hydroxyl group content and efficient photo-charge separation (photoelectrochemical characterization, PEC), which can explain the suppression of visible photoluminescence (PL). Crystallization at 450 degrees C renders the most active sample, likely due to the development of a pure anatase structure with a large surface boron enrichment. A shift in the wavelength-dependent activity profile (PEC data) and the lowest electron-hole recombination rate (PL data) are also observed for this sample" |
| Notes: | "PubMed-not-MEDLINECano-Casanova, L Anson-Casaos, A Hernandez-Ferrer, J Benito, A M Maser, W K Garro, N Lillo-Rodenas, M A Roman-Martinez, M C eng 2022/10/04 ACS Appl Nano Mater. 2022 Sep 23; 5(9):12527-12539. doi: 10.1021/acsanm.2c02217. Epub 2022 Aug 24" |
