Preparation and photoactivity of samarium loaded anatase, brookite and rutilecatalysts

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Abstract

Pure and samarium loaded anatase, brookite and rutile nanopowders were synthesized by thermohydrolysisof TiCl4. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), specific surface area (SSA) determination, UV–vis diffuse reflectance spectroscopy (DRS), atomicforce microscopy (AFM), contact angle (CA) measurements and photoluminescence (PL) spectroscopy.The photocatalytic activity of pure and Sm-loaded TiO2 polymorphs was investigated by employing thephotodegradation of 4-nitrophenol as probe reaction in a liquid-solid system. Loading withSmresulted inan improvement of the photoreactivity of the three TiO2 polymorphs. The beneficial effect was explainedby an increased separation efficiency of the photogenerated electron–hole pairs. Thin films were obtainedby dip coating from water dispersions of the bare and loaded samples. The addition of samarium causeda reduction of the contact angle of the films. A nearly superhydrophilic property was exhibited by theSm-loaded brookite film.
Lingua originaleEnglish
pagine (da-a)291-299
Numero di pagine9
RivistaAPPLIED CATALYSIS. B, ENVIRONMENTAL
Volume104
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • Catalysis
  • ???subjectarea.asjc.2300.2300???
  • Process Chemistry and Technology

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