NDLI: Experimental and computational studies of nitrogen doped Degussa P25 TiO<sub>2</sub>: application to visible-light driven photo-oxidation of As(iii)

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Catalysis Science & Technology Vol - 2 Issue - 3

Catalysis Science & Technology Vol - 2 Issue - 2

Catalysis Science & Technology Vol -1

Experimental and computational studies of nitrogen doped Degussa P25 TiO₂: application to visible-light driven photo-oxidation of As(iii)

Content Provider	Royal Society of Chemistry (RSC)
Author	Rämö, Jaakko Highfield, James G. Pehkonen, Simo O. Laasonen, Kari Wang, Xiaoling Väänänen, Marja
Copyright Year	2012
Abstract	Degussa P25 TiO2 doped with nitrogen via NH3 treatment at 400–600 °C was found to be capable of catalyzing the photo-oxidation of aqueous As(III) to As(V) under visible light. Substitutional doping of N for O creates N–Ti–O surface linkages, as confirmed by XPS. Kinetic studies have been performed in batch systems with 40 μM As(III) and 0.05 g L−1 TiO2. Photocatalytic oxidation of As(III) in the presence of N-doped TiO2 annealed at 500 °C was complete within 4 hours of irradiation at λ > 435 nm. The presence of titanium oxynitride (or similar surface moieties) is linked with the good photooxidation catalytic activity toward As(III). Zeta potentials of the N-doped TiO2 showed negative shifts at low pH values, which became more pronounced when measured after photocatalytic testing, suggesting at least partial retention of As(V). First principles DFT calculations were also carried out for a model anatase (101) surface, in both the pristine and N-doped condition. Dissociation of water is energetically favoured over the N-TiO2 surface. This surface activation mechanism provides the rationale for increased As(V) retention. Enhanced adsorptive properties in TiO2 would render it a more versatile remediation agent.
Starting Page	784
Ending Page	793
Page Count	10
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	2
Issue Number	4
Journal	Catalysis Science & Technology
DOI	10.1039/c2cy00486k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Degussa Ammonia Zeta Anatase Dopant Titanium PH Nitrogen Evonik Industries Silicon oxynitride
Content Type	Text
Resource Type	Article
Subject	Catalysis

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