Optimization of the NO photooxidation and the role of relative humidity

• Type: Article in International Scientific Journal
• Date: 2018-09-01

Authors

Joana Ângelo (Author) Other; Pedro Magalhães (Author) Other; Luís M. Madeira (Author) FEUP; Luísa Andrade (Author) FEUP; Adélio Mendes (Author) FEUP

Journal

Title: Environmental Pollution

Vol. 240

Pages: 541-548

ISSN: 0269-7491

Publisher: Elsevier

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Scopus - 4 Citations

Associated Projects

BI-DSC - Building Integrated Dye Sensitized Solar Cells

LEPABE-2-ECO-INNOVATION - LEPABE-2-ECO-INNOVATION

Other information

Authenticus ID: P-010-4E8

DOI: 10.1016/j.envpol.2018.04.051

Abstract (EN): Photocatalysis was recognised as a suitable process for the photoabatement of atmospheric pollutants. The photooxidation mechanism on TiO2 has been widely studied. However, recent studies demonstrated that the very often-assumed photooxidation intermediated by the hydroxyl radical cannot explain all the experimental observations. Indeed, this study contributes for a new understanding of NO photooxidation. First, the adsorption equilibrium isotherms of NO, NO2 and H2O on the photocatalyst, Aeroxide (R) P25 from Evonik Industries, were obtained. Also, the concentration of hydroxyl radicals was determined by photoluminescence. A comprehensive design of experiments was then followed; NO conversion and selectivity were obtained as a function of the relative humidity, irradiance, NO inlet concentration and residence time, following a response surface methodology (RSM). These results were then used to discuss the photooxidation mechanism of NO.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8