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TiO2 Surface Hybridisation with Noble Metals (Ag and CuxO) for Solar De-NOx and VOC Removal

preprint
submitted on 26.04.2020, 19:19 and posted on 27.04.2020, 13:14 by David Maria Tobaldi, Luc Lajaunie, Maria Paula Seabra, Raul Arenal, Joao Antonio Labrincha

Indoor and outdoor air pollution remains a major health risk for human beings. Nitrogen oxides and volatile organic compounds are amongst the major pollutant found outdoor. Thus, actions to diminish such risks and to provide safer outdoor / indoor environment are required. In this research work, we have decorated the surface of TiO2 with noble-metal oxides (Ag and/or CuxO) to improve the photocatalytic performances (removal of nitrogen oxides and benzene) under simulated solar-light irradiation. By means of advanced X-ray methods it has been shown that noble metals did not enter the TiO2 crystal structure, although they retarded the anatase-to-rutile phase transition and crystal growth.

Photocatalytic activity was assessed in the gas-solid phase, monitoring the degradation of NOx and benzene, using a lamp simulating the solar radiation. Results showed that TiO2 modified with an Ag:Cu molar ratio equal to 1:1 (with Ag+Cu = 0.5+0.5 mol% = 1 mol%), was that exhibiting best de-NOx and benzene removal performances.

Funding

FCT/484/15/01/2019/S

UIDB/50011/2020

UIDP/50011/2020

MAT2016-79776-P

“Construyendo Europa desde Aragon” 2014–2020 (grant number E/26)

History

Email Address of Submitting Author

david.tobaldi@ua.pt

Institution

DEMaC & CICECO, University of Aveiro

Country

Portugal

ORCID For Submitting Author

0000-0002-0112-8570

Declaration of Conflict of Interest

Nope

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