N and N, S-doped TiO2 photocatalysts and their activity in NOx oxidation (Journal article)

Todorova, N./ Vaimakis, T./ Petrakis, D./ Hishita, S./ Boukos, N./ Giannakopoulou, T./ Giannouri, M./ Antiohos, S./ Papageorgiou, D./ Chaniotakis, E./ Trapalis, C.


N-doped and N, S-codoped titania powders were prepared applying simple chemical treatment with various modifiers. The N and S were introduced preserving the crystalline structure, morphology and specific surface area of the initial TiO2. The level of N, S doping varied depending on the modifier two of which were structural isomers. In all samples, N was found interstitially incorporated in the TiO2 lattice. S was recorded in ionic states S6+ and S4+. All modified powders exhibited enhanced visible light absorption and narrower energy band gap in comparison to the initial titania. Except for the N-doped titania, the photocatalytic activity in NOx oxidation under UV light decreased after doping, while the activity under visible light did not increase for all modified samples. This outcome was related to the high level of N and S doping and intense e(-)-h(+) recombination on dopants' sites. The activity of the photocatalysts in NOx oxidation processes was also connected to the type of non-metal dopant in the lattice of TiO2. The beneficial effect of N-doping was ascribed to the preferential formation of center dot OH species on N-doped surface, whereas the detrimental effect of N, S-codoping was credited to the suppressed center dot OH production on S-doped surface. (C) 2012 Elsevier B.V. All rights reserved.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: tio2 nanoparticles,n, s-doping,visible light,nox,photocatalysis,visible-light,titanium-dioxide,codoped tio2,nitrogen,powders,surface,degradation,n-2
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/8561
ISSN: 0920-5861
Link: <Go to ISI>://000319498800008
http://ac.els-cdn.com/S0920586112008309/1-s2.0-S0920586112008309-main.pdf?_tid=43f2bab2-5356-11e3-98ec-00000aacb35f&acdnat=1385111752_3479bbce4c3b5c825938f8daca366bf9
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

Files in This Item:
File Description SizeFormat 
Todorova-2013-N and N, S-doped TiO.pdf2.01 MBAdobe PDFView/Open    Request a copy



 Please use this identifier to cite or link to this item:
http://olympias.lib.uoi.gr/jspui/handle/123456789/8561
  This item is a favorite for 0 people.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.