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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 and posted on 27.04.2020 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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