Fotokatalytiske materialer i byrummet - resultater fra forsøg på Gasværksvej og Københavns lufthavn
PART 1: Fundamentals of Photocatalysis and the Gasværksvej test site
Andrea Folli, consultant, Teknologisk Institut
October 17, 2013
By analogy with natural photosynthesis, the semiconductor oxide titanium dioxide, chemical formula: TiO2, is able to harvest sunlight and catalyse/activate a series of chemical reactions. Its applications are very diverse: from the oxidation and mineralisation of numerous organic and inorganic pollutants to the photo-induced water-splitting to produce hydrogen, or other artificial photosynthetic processes to synthesis short chain organics. The great advantage provided by solar-based photocatalysis is that the only requirements, beyond the semiconductor, are sunlight, oxygen and water, making this technology a valid alternative for generating clean energy and remediating, sustainably, polluted waters and air.
In this lecture we explore the fundamentals of TiO2-based photocatalysis and we illustrate the mechanism through which sunlight is harvested and chemical reactions promoted. Following then recent large-scale applications of TiO2-based photocatalysts as a concrete supplement or finish for the removal of nitrogen oxides (NOx) from the air, we show how photocatalytic concrete paving blocks employed in a central area of Copenhagen helped to improve the air quality and mitigate the amount of air pollutants. Our tests in Gasværksvej showed that in the most favourable period of the year in terms of UV concentration in the sunlight, NOx reduction between 20 % and 30 % can be achieved.
The Gasværksvej project is a joint collaboration of Teknologisk Institut (DK), Københavns Kommune (DK), Starka Betong Industrier (SE) and C.K. Environment (DK).
PART 2: Anvendelse af fotokatalytiske materialer i Københavns lufthavn
Henrik Jensen, CTO and partner, Photocat A/S
Arrangementet foregår på engelsk.
Få højt specialiseret viden og rabat på arrangementer, som medlem af IDAs 40 fagtekniske netværk.