engleski

Solar photocatalysis for degradation of ammonia in air using TiO 2 modified

In this work we present the application of solar photocatalysis for purification of air polluted by ammonia (NH 3 ). Experiments were done in pilot scale reactors for user-customized tests including the simulation of real environment: Compound Parabolic Collector reactor (CPC) and Photocatalytic Wind Tunnel (PWT) that presents a physical model for estimation of air- borne pollutant degradation over TiO 2 based photocatalytic layer on recycled rubber in respect to different conditions (humidity, temperature, UV intensity, air/gas flow and concentration). Continuous air quality monitoring was achieved using gas sensors (NH 3, NOx, H 2 , CO, CO 2 , CxHy). All studies were performed under artificial solar irradiation with different portions of UVB, UVA and visible light. Irradiation intensity measurements ; with the emphasis on UVA and UVB intensities at different wavelengths were continuously monitored. The tentative application of solar photocatalysis for air purification was evaluated based on detailed kinetic study and intrinsic kinetic rates of particular pollutants. Titanium dioxide was immobilized by adding the TiO 2 particles directly into mixture during the industrial production. TiO 2 as a photocatalyst is chemically stable compound, non-toxic, commercially available, high effective with optical electronic properties. Nowadays, TiO 2 as a filler or photocatalyst on different rubber polymers is already used. Results showed the preferred oxidation pathway of ammonia to N 2 . Ammonia oxidation was achieved using TiO 2 modified recycled rubber, but also in control experiments without TiO 2 layer, pin-pointing the possible wet catalytic oxidation coupled with photocatalytic driven mechanism. Wet catalytic oxidation was explained due to metalloid particles in the rubber. Finally, TiO 2 layer on recycled rubber contribute to the protection of the rubber against typical wear due to atmospheric exposure, confirming the use of these new materials for passive air protection.

solar photocatalysis, air purification, pollutant degradation

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