Photocatalytic properties of TiO2 and Fe-doped TiO2 prepared by metal organic framework-mediated synthesis
van Koppen, L.
KAUST DepartmentChemical Engineering Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Online Publication Date2018-11-19
Print Publication Date2019-03
Permanent link to this recordhttp://hdl.handle.net/10754/630154
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AbstractThe Ti-containing metal organic framework (MOF) MIL-125 has been used as sacrificial precursor to obtain TiO2 materials through the MOF-mediated synthesis route. In this study, Fe3+ was deposited on the surface of MIL-125 after its hydrothermal synthesis. Targeted Fe-doped titania photocatalysts were prepared through the direct calcination in air of Fe/MIL-125 crystals and/or by using a two-step method, including carbonization in inert atmosphere followed by calcination in air. The relationship between the synthesis conditions and the properties of the Fe-doped titania nanopowders, such as Fe content, porosity, phase composition and particle size was investigated. From elemental mapping, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, UV–Vis absorption spectroscopy and photoluminescence emission spectra, the presence of highly dispersed Fe3+ ions incorporated into the TiO2 crystal lattice was confirmed, which led to a significant red shift of photoresponse towards visible light and reduced the recombination rate of electron-hole pairs at low iron content. By varying the pre-carbonization temperature, both crystal size and phase composition in the final materials were modulated. The performance of Fe-doped titania materials in photocatalytic water-splitting was tested for hydrogen evolution. Optimal photocatalytic performance was found at 0.15 and 0.5 wt. % iron concentration and exceeded those of non-doped titania and commercial anatase both under visible and UV light irradiation, respectively, and among the highest reported in literature for these systems.
CitationValero-Romero MJ, Santaclara JG, Oar-Arteta L, van Koppen L, Osadchii DY, et al. (2019) Photocatalytic properties of TiO2 and Fe-doped TiO2 prepared by metal organic framework-mediated synthesis. Chemical Engineering Journal 360: 75–88. Available: http://dx.doi.org/10.1016/j.cej.2018.11.132.
SponsorsThe authors would like to thank ADREM (EU Horizon 2020 call SPIRE-05-2015) for financial support. We are grateful to the ESRF (beamline BM23) where we performed the XAS measurements. We also want to thank to Bart van der Linden from Delft for all his support with the photocatalytic set up.
JournalChemical Engineering Journal